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‎README.md

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@@ -315,6 +315,7 @@ Php-based LeetCode algorithm problem solutions, regularly updated.
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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| 0322 |[Coin Change](src/main/php/g0301_0400/s0322_coin_change/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m\*n)_Space_O(amount) | 185 | 96.30
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#### Day 21
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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| 0438 |[Find All Anagrams in a String](src/main/php/g0401_0500/s0438_find_all_anagrams_in_a_string/Solution.php)| Medium | Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1) | 29 | 66.67
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#### Day 13
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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| 0438 |[Find All Anagrams in a String](src/main/php/g0401_0500/s0438_find_all_anagrams_in_a_string/Solution.php)| Medium | Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1) | 29 | 66.67
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#### Day 13 Hashmap
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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| 0394 |[Decode String](src/main/php/g0301_0400/s0394_decode_string/Solution.php)| Medium | Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n) | 3 | 77.78
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#### Day 15 Heap
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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| 0543 |[Diameter of Binary Tree](src/main/php/g0501_0600/s0543_diameter_of_binary_tree/Solution.php)| Easy | Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) | 0 | 100.00
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| 0437 |[Path Sum III](src/main/php/g0401_0500/s0437_path_sum_iii/Solution.php)| Medium | Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) | 8 | 100.00
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748754
#### Day 8 Binary Search
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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| 0198 |[House Robber](src/main/php/g0101_0200/s0198_house_robber/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) | 4 | 64.29
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| 0322 |[Coin Change](src/main/php/g0301_0400/s0322_coin_change/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m\*n)_Space_O(amount) | 185 | 96.30
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#### Day 13 Dynamic Programming
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| 0416 |[Partition Equal Subset Sum](src/main/php/g0401_0500/s0416_partition_equal_subset_sum/Solution.php)| Medium | Top_100_Liked_Questions, Array, Dynamic_Programming, Big_O_Time_O(n\*sums)_Space_O(n\*sums) | 245 | 86.67
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| 0152 |[Maximum Product Subarray](src/main/php/g0101_0200/s0152_maximum_product_subarray/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) | 15 | 92.86
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783791
#### Day 14 Sliding Window/Two Pointer
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| 0003 |[Longest Substring Without Repeating Characters](src/main/php/g0001_0100/s0003_longest_substring_without_repeating_characters/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1) | 4 | 99.33
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| 0020 |[Valid Parentheses](src/main/php/g0001_0100/s0020_valid_parentheses/Solution.php)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n) | 3 | 88.14
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| 0005 |[Longest Palindromic Substring](src/main/php/g0001_0100/s0005_longest_palindromic_substring/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) | 13 | 98.57
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| 0394 |[Decode String](src/main/php/g0301_0400/s0 F987 394_decode_string/Solution.php)| Medium | Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n) | 3 | 77.78
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| 0049 |[Group Anagrams](src/main/php/g0001_0100/s0049_group_anagrams/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n\*k_log_k)_Space_O(n) | 27 | 80.85
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#### Udemy Binary Search
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| 0094 |[Binary Tree Inorder Traversal](src/main/php/g0001_0100/s0094_binary_tree_inorder_traversal/Solution.php)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Big_O_Time_O(n)_Space_O(n) | 3 | 82.09
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| 0102 |[Binary Tree Level Order Traversal](src/main/php/g0101_0200/s0102_binary_tree_level_order_traversal/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N) | 4 | 96.08
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| 0543 |[Diameter of Binary Tree](src/main/php/g0501_0600/s0543_diameter_of_binary_tree/Solution.php)| Easy | Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) | 0 | 100.00
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| 0226 |[Invert Binary Tree](src/main/php/g0201_0300/s0226_invert_binary_tree/Solution.php)| Easy | Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) | 6 | 62.79
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| 0104 |[Maximum Depth of Binary Tree](src/main/php/g0101_0200/s0104_maximum_depth_of_binary_tree/Solution.php)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(H) | 9 | 63.06
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| 0124 |[Binary Tree Maximum Path Sum](src/main/php/g0101_0200/s0124_binary_tree_maximum_path_sum/Solution.php)| Hard | Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N) | 16 | 100.00
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| 0338 |[Counting Bits](src/main/php/g0301_0400/s0338_counting_bits/Solution.php)| Easy | Top_100_Liked_Questions, Dynamic_Programming, Bit_Manipulation, Big_O_Time_O(num)_Space_O(num) | 13 | 97.92
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#### Udemy Design
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| 0238 |[Product of Array Except Self](src/main/php/g0201_0300/s0238_product_of_array_except_self/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Prefix_Sum, Big_O_Time_O(n^2)_Space_O(n) | 58 | 86.76
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| 0560 |[Subarray Sum Equals K](src/main/php/g0501_0600/s0560_subarray_sum_equals_k/Solution.php)| Medium | Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Big_O_Time_O(n)_Space_O(n) | 82 | 100.00
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#### Day 6 String
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| 0215 |[Kth Largest Element in an Array](src/main/php/g0201_0300/s0215_kth_largest_element_in_an_array/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Big_O_Time_O(n\*log(n))_Space_O(log(n)) | 222 | 49.15
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| 0347 |[Top K Frequent Elements](src/main/php/g0301_0400/s0347_top_k_frequent_elements/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort, Big_O_Time_O(n\*log(n))_Space_O(k) | 23 | 84.85
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#### Day 21 Heap Priority Queue
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| 0438 |[Find All Anagrams in a String](src/main/php/g0401_0500/s0438_find_all_anagrams_in_a_string/Solution.php)| Medium | Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1) | 29 | 66.67
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#### Day 6 Breadth First Search Depth First Search
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| 0072 |[Edit Distance](src/main/php/g0001_0100/s0072_edit_distance/Solution.php)| Hard | Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) | 29 | 75.00
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| 0322 |[Coin Change](src/main/php/g0301_0400/s0322_coin_change/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m\*n)_Space_O(amount) | 185 | 96.30
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#### Day 19 Bit Manipulation
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| # | Title | Difficulty | Tag | Time, ms | Time, %
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|------|----------------|-------------|-------------|----------|---------
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| 0560 |[Subarray Sum Equals K](src/main/php/g0501_0600/s0560_subarray_sum_equals_k/Solution.php)| Medium | Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Data_Structure_II_Day_5_Array, Big_O_Time_O(n)_Space_O(n) | 82 | 100.00
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| 0543 |[Diameter of Binary Tree](src/main/php/g0501_0600/s0543_diameter_of_binary_tree/Solution.php)| Easy | Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n) | 0 | 100.00
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| 0494 |[Target Sum](src/main/php/g0401_0500/s0494_target_sum/Solution.php)| Medium | Top_100_Liked_Questions, Array, Dynamic_Programming, Backtracking, Big_O_Time_O(n\*(sum+s))_Space_O(n\*(sum+s)) | 27 | 75.00
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| 0438 |[Find All Anagrams in a String](src/main/php/g0401_0500/s0438_find_all_anagrams_in_a_string/Solution.php)| Medium | Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Programming_Skills_II_Day_12, Level_1_Day_12_Sliding_Window/Two_Pointer, Big_O_Time_O(n+m)_Space_O(1) | 29 | 66.67
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| 0437 |[Path Sum III](src/main/php/g0401_0500/s0437_path_sum_iii/Solution.php)| Medium | Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Big_O_Time_O(n)_Space_O(n) | 8 | 100.00
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| 0416 |[Partition Equal Subset Sum](src/main/php/g0401_0500/s0416_partition_equal_subset_sum/Solution.php)| Medium | Top_100_Liked_Questions, Array, Dynamic_Programming, Level_2_Day_13_Dynamic_Programming, Big_O_Time_O(n\*sums)_Space_O(n\*sums) | 245 | 86.67
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| 0394 |[Decode String](src/main/php/g0301_0400/s0394_decode_string/Solution.php)| Medium | Top_100_Liked_Questions, String, Stack, Recursion, Level_1_Day_14_Stack, Udemy_Strings, Big_O_Time_O(n)_Space_O(n) | 3 | 77.78
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| 0347 |[Top K Frequent Elements](src/main/php/g0301_0400/s0347_top_k_frequent_elements/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort, Data_Structure_II_Day_20_Heap_Priority_Queue, Big_O_Time_O(n\*log(n))_Space_O(k) | 23 | 84.85
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| 0338 |[Counting Bits](src/main/php/g0301_0400/s0338_counting_bits/Solution.php)| Easy | Top_100_Liked_Questions, Dynamic_Programming, Bit_Manipulation, Udemy_Bit_Manipulation, Big_O_Time_O(num)_Space_O(num) | 13 | 97.92
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| 0322 |[Coin Change](src/main/php/g0301_0400/s0322_coin_change/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_20, Level_2_Day_12_Dynamic_Programming, Big_O_Time_O(m\*n)_Space_O(amount) | 185 | 96.30
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| 0300 |[Longest Increasing Subsequence](src/main/php/g0201_0300/s0300_longest_increasing_subsequence/Solution.php)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search, Algorithm_II_Day_16_Dynamic_Programming, Binary_Search_II_Day_3, Dynamic_Programming_I_Day_18, Udemy_Dynamic_Programming, Big_O_Time_O(n\*log_n)_Space_O(n) | 24 | 90.91
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| 0295 |[Find Median from Data Stream](src/main/php/g0201_0300/s0295_find_median_from_data_stream/MedianFinder.php)| Hard | Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Design, Heap_Priority_Queue, Data_Stream, Big_O_Time_O(n\*log_n)_Space_O(n) | 332 | 75.00
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| 0287 |[Find the Duplicate Number](src/main/php/g0201_0300/s0287_find_the_duplicate_number/Solution.php)| Medium | Top_100_Liked_Questions, Top_In 10000 terview_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation, Binary_Search_II_Day_5, Big_O_Time_O(n)_Space_O(n) | 174 | 76.92

‎src/main/php/g0301_0400/s0322_coin_change/Solution.php

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<?php
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namespace leetcode\g0301_0400\s0322_coin_change;
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// #Medium #Top_100_Liked_Questions #Top_Interview_Questions #Array #Dynamic_Programming
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// #Breadth_First_Search #Algorithm_II_Day_18_Dynamic_Programming #Dynamic_Programming_I_Day_20
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// #Level_2_Day_12_Dynamic_Programming #Big_O_Time_O(m*n)_Space_O(amount)
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// #2023_12_24_Time_185_ms_(96.30%)_Space_19.4_MB_(62.96%)
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class Solution {
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/**
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* @param Integer[] $coins
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* @param Integer $amount
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* @return Integer
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*/
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public function coinChange($coins, $amount) {
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$dp = array_fill(0, $amount + 1, 0);
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$dp[0] = 1;
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foreach ($coins as $coin) {
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for ($i = $coin; $i <= $amount; $i++) {
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$prev = $dp[$i - $coin];
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if ($prev > 0) {
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if ($dp[$i] == 0) {
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$dp[$i] = $prev + 1;
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} else {
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$dp[$i] = min($dp[$i], $prev + 1);
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}
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}
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}
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}
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return $dp[$amount] - 1;
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}
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}

‎src/main/php/g0301_0400/s0322_coin_change/readme.md

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322\. Coin Change
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Medium
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You are given an integer array `coins` representing coins of different denominations and an integer `amount` representing a total amount of money.
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Return _the fewest number of coins that you need to make up that amount_. If that amount of money cannot be made up by any combination of the coins, return `-1`.
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You may assume that you have an infinite number of each kind of coin.
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**Example 1:**
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**Input:** coins = [1,2,5], amount = 11
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**Output:** 3
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**Explanation:** 11 = 5 + 5 + 1
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**Example 2:**
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**Input:** coins = [2], amount = 3
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**Output:** -1
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**Example 3:**
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**Input:** coins = [1], amount = 0
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**Output:** 0
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**Constraints:**
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* `1 <= coins.length <= 12`
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* <code>1 <= coins[i] <= 2<sup>31</sup> - 1</code>
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* <code>0 <= amount <= 10<sup>4</sup></code>

‎src/main/php/g0301_0400/s0338_counting_bits/Solution.php

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<?php
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namespace leetcode\g0301_0400\s0338_counting_bits;
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// #Easy #Top_100_Liked_Questions #Dynamic_Programming #Bit_Manipulation #Udemy_Bit_Manipulation
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// #Big_O_Time_O(num)_Space_O(num) #2023_12_24_Time_13_ms_(97.92%)_Space_24.8_MB_(97.92%)
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class Solution {
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/**
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* @param Integer $n
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* @return Integer[]
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*/
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public function countBits($num) {
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$result = array_fill(0, $num + 1, 0);
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$borderPos = 1;
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$incrPos = 1;
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for ($i = 1; $i < count($result); $i++) {
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// when we reach pow of 2 , reset borderPos and incrPos
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if ($incrPos == $borderPos) {
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$result[$i] = 1;
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$incrPos = 1;
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$borderPos = $i;
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} else {
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$result[$i] = 1 + $result[$incrPos++];
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}
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}
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return $result;
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}
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}

‎src/main/php/g0301_0400/s0338_counting_bits/readme.md

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338\. Counting Bits
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Easy
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Given an integer `n`, return _an array_ `ans` _of length_ `n + 1` _such that for each_ `i` (`0 <= i <= n`)_,_ `ans[i]` _is the **number of**_ `1`_**'s** in the binary representation of_ `i`.
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**Example 1:**
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**Input:** n = 2
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**Output:** [0,1,1]
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**Explanation:**
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0 --> 0
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1 --> 1
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2 --> 10
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**Example 2:**
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**Input:** n = 5
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**Output:** [0,1,1,2,1,2]
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**Explanation:**
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0 --> 0
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1 --> 1
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2 --> 10
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3 --> 11
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4 --> 100
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5 --> 101
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**Constraints:**
 97AE
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* <code>0 <= n <= 10<sup>5</sup></code>
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**Follow up:**
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* It is very easy to come up with a solution with a runtime of `O(n log n)`. Can you do it in linear time `O(n)` and possibly in a single pass?
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* Can you do it without using any built-in function (i.e., like `__builtin_popcount` in C++)?

‎src/main/php/g0301_0400/s0347_top_k_frequent_elements/Solution.php

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<?php
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namespace leetcode\g0301_0400\s0347_top_k_frequent_elements;
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// #Medium #Top_100_Liked_Questions #Top_Interview_Questions #Array #Hash_Table #Sorting
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// #Heap_Priority_Queue #Counting #Divide_and_Conquer #Quickselect #Bucket_Sort
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// #Data_Structure_II_Day_20_Heap_Priority_Queue #Big_O_Time_O(n*log(n))_Space_O(k)
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// #2023_12_24_Time_23_ms_(84.85%)_Space_21.6_MB_(100.00%)
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class Solution {
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/**
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* @param Integer[] $nums
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* @param Integer $k
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* @return Integer[]
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*/
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public function topKFrequent($nums, $k) {
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$count = [];
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foreach ($nums as $num) {
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if (!isset($count[$num])) {
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$count[$num] = 0;
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}
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$count[$num] += 1;
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}
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arsort($count);
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$result = [];
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$r = 0;
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foreach ($count as $i => $num) {
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$result[] = $i;
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$r++;
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if ($r === $k) {
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break;
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}
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}
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return $result;
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}
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}

‎src/main/php/g0301_0400/s0347_top_k_frequent_elements/readme.md

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347\. Top K Frequent Elements
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Medium
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Given an integer array `nums` and an integer `k`, return _the_ `k` _most frequent elements_. You may return the answer in **any order**.
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**Example 1:**
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**Input:** nums = [1,1,1,2,2,3], k = 2
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**Output:** [1,2]
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**Example 2:**
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**Input:** nums = [1], k = 1
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**Output:** [1]
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**Constraints:**
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* <code>1 <= nums.length <= 10<sup>5</sup></code>
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* `k` is in the range `[1, the number of unique elements in the array]`.
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* It is **guaranteed** that 10000 the answer is **unique**.
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**Follow up:** Your algorithm's time complexity must be better than `O(n log n)`, where n is the array's size.

‎src/main/php/g0301_0400/s0394_decode_string/Solution.php

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<?php
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namespace leetcode\g0301_0400\s0394_decode_string;
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// #Medium #Top_100_Liked_Questions #String #Stack #Recursion #Level_1_Day_14_Stack #Udemy_Strings
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// #Big_O_Time_O(n)_Space_O(n) #2023_12_24_Time_3_ms_(77.78%)_Space_19.7_MB_(11.11%)
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class Solution {
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private $i = 0;
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/**
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* @param String $s
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* @return String
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*/
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public function decodeString($s) {
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$count = 0;
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$sb = "";
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while ($this->i < strlen($s)) {
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$c = $s[$this->i];
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$this->i++;
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if (ctype_alpha($c)) {
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$sb .= $c;
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} elseif (ctype_digit($c)) {
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$count = $count * 10 + intval($c);
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} elseif ($c == ']') {
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break;
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} elseif ($c == '[') {
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// sub problem
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$repeat = $this->decodeString($s);
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while ($count > 0) {
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$sb .= $repeat;
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$count--;
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}
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}
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}
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return $sb;
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}
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}

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