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FoxAndMp3.java
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170 lines (133 loc) · 5.27 KB
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import java.util.*;
public class FoxAndMp3 {
public String[] playList(int n) {
Set<String> set = new HashSet<>();
for(int i = 0, m = 1; i < 10; i++, m *= 10){
for(int j = 0; j <= 50; j++){
if(m+j <= n){
set.add((m+j)+ ".mp3");
}
}
}
List<String> al = new ArrayList<>();
for(String s : set)al.add(s);
Collections.sort(al);
if(n > 50) n = 50;
String[] ans = new String[n];
for(int i = 0; i < ans.length; i++) ans[i] = al.get(i);
return ans;
}
// BEGIN CUT HERE
public static void main(String[] args) {
if (args.length == 0) {
FoxAndMp3Harness.run_test(-1);
} else {
for (int i=0; i<args.length; ++i)
FoxAndMp3Harness.run_test(Integer.valueOf(args[i]));
}
}
// END CUT HERE
}
// BEGIN CUT HERE
class FoxAndMp3Harness {
public static void run_test(int casenum) {
if (casenum != -1) {
if (runTestCase(casenum) == -1)
System.err.println("Illegal input! Test case " + casenum + " does not exist.");
return;
}
int correct = 0, total = 0;
for (int i=0;; ++i) {
int x = runTestCase(i);
if (x == -1) {
if (i >= 100) break;
continue;
}
correct += x;
++total;
}
if (total == 0) {
System.err.println("No test cases run.");
} else if (correct < total) {
System.err.println("Some cases FAILED (passed " + correct + " of " + total + ").");
} else {
System.err.println("All " + total + " tests passed!");
}
}
static boolean compareOutput(String[] expected, String[] result) { if (expected.length != result.length) return false; for (int i=0; i<expected.length; ++i) if (!expected[i].equals(result[i])) return false; return true; }
static String formatResult(String[] res) {
String ret = "";
ret += "{";
for (int i=0; i<res.length; ++i) {
if (i > 0) ret += ",";
ret += String.format(" \"%s\"", res[i]);
}
ret += " }";
return ret;
}
static int verifyCase(int casenum, String[] expected, String[] received) {
System.err.print("Example " + casenum + "... ");
if (compareOutput(expected, received)) {
System.err.println("PASSED");
return 1;
} else {
System.err.println("FAILED");
System.err.println(" Expected: " + formatResult(expected));
System.err.println(" Received: " + formatResult(received));
return 0;
}
}
static int runTestCase(int casenum__) {
switch(casenum__) {
case 0: {
int n = 3;
String[] expected__ = {"1.mp3", "2.mp3", "3.mp3" };
return verifyCase(casenum__, expected__, new FoxAndMp3().playList(n));
}
case 1: {
int n = 10;
String[] expected__ = {"1.mp3", "10.mp3", "2.mp3", "3.mp3", "4.mp3", "5.mp3", "6.mp3", "7.mp3", "8.mp3", "9.mp3" };
return verifyCase(casenum__, expected__, new FoxAndMp3().playList(n));
}
case 2: {
int n = 16;
String[] expected__ = {"1.mp3", "10.mp3", "11.mp3", "12.mp3", "13.mp3", "14.mp3", "15.mp3", "16.mp3", "2.mp3", "3.mp3", "4.mp3", "5.mp3", "6.mp3", "7.mp3", "8.mp3", "9.mp3" };
return verifyCase(casenum__, expected__, new FoxAndMp3().playList(n));
}
case 3: {
int n = 32;
String[] expected__ = {"1.mp3", "10.mp3", "11.mp3", "12.mp3", "13.mp3", "14.mp3", "15.mp3", "16.mp3", "17.mp3", "18.mp3", "19.mp3", "2.mp3", "20.mp3", "21.mp3", "22.mp3", "23.mp3", "24.mp3", "25.mp3", "26.mp3", "27.mp3", "28.mp3", "29.mp3", "3.mp3", "30.mp3", "31.mp3", "32.mp3", "4.mp3", "5.mp3", "6.mp3", "7.mp3", "8.mp3", "9.mp3" };
return verifyCase(casenum__, expected__, new FoxAndMp3().playList(n));
}
case 4: {
int n = 100000009;
String[] expected__ = {"1.mp3", "10.mp3", "100.mp3", "1000.mp3", "10000.mp3", "100000.mp3", "1000000.mp3", "10000000.mp3", "100000000.mp3", "100000001.mp3", "100000002.mp3", "100000003.mp3", "100000004.mp3", "100000005.mp3", "100000006.mp3", "100000007.mp3", "100000008.mp3", "100000009.mp3", "10000001.mp3", "10000002.mp3", "10000003.mp3", "10000004.mp3", "10000005.mp3", "10000006.mp3", "10000007.mp3", "10000008.mp3", "10000009.mp3", "1000001.mp3", "10000010.mp3", "10000011.mp3", "10000012.mp3", "10000013.mp3", "10000014.mp3", "10000015.mp3", "10000016.mp3", "10000017.mp3", "10000018.mp3", "10000019.mp3", "1000002.mp3", "10000020.mp3", "10000021.mp3", "10000022.mp3", "10000023.mp3", "10000024.mp3", "10000025.mp3", "10000026.mp3", "10000027.mp3", "10000028.mp3", "10000029.mp3", "1000003.mp3" };
return verifyCase(casenum__, expected__, new FoxAndMp3().playList(n));
}
case 5: {
int n = 1;
String[] expected__ = {"1.mp3" };
return verifyCase(casenum__, expected__, new FoxAndMp3().playList(n));
}
// custom cases
/* case 6: {
int n = ;
String[] expected__ = ;
return verifyCase(casenum__, expected__, new FoxAndMp3().playList(n));
}*/
/* case 7: {
int n = ;
String[] expected__ = ;
return verifyCase(casenum__, expected__, new FoxAndMp3().playList(n));
}*/
/* case 8: {
int n = ;
String[] expected__ = ;
return verifyCase(casenum__, expected__, new FoxAndMp3().playList(n));
}*/
default:
return -1;
}
}
}
// END CUT HERE