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Source : https://oj.leetcode.com/problems/n-queens/","// Author : Hao Chen","// Date : 2014-08-22","","/********************************************************************************** ","* ","* The n-queens puzzle is the problem of placing n queens on an n×n chessboard ","* such that no two queens attack each other.","* ","* Given an integer n, return all distinct solutions to the n-queens puzzle.","* ","* Each solution contains a distinct board configuration of the n-queens' placement, ","* where 'Q' and '.' both indicate a queen and an empty space respectively.","* ","* For example,","* There exist two distinct solutions to the 4-queens puzzle:","* ","* [","* [\".Q..\", // Solution 1","* \"...Q\",","* \"Q...\",","* \"..Q.\"],","* ","* [\"..Q.\", // Solution 2","* \"Q...\",","* \"...Q\",","* \".Q..\"]","* ]","* ","* ","**********************************************************************************/","","#include \u003cstdlib.h\u003e","#include \u003ciostream\u003e","#include 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Nothing's tricky.","// 1) recursively find all of possible columns row by row.","// 2) solution[] array only stores the columns index. `solution[row] = col;` ","void solveNQueensRecursive(int n, int currentRow, vector\u003cint\u003e\u0026 solution, vector\u003c vector\u003cstring\u003e \u003e\u0026 result) {"," //if no more row need to do, shape the result"," if (currentRow == n){"," vector\u003cstring\u003e s;"," for (int row = 0; row \u003c n; row++) {"," string sRow;"," for (int col = 0; col \u003c n; col++) {"," sRow = sRow + (solution[row] == col ? \"Q\" :\".\" );"," }"," s.push_back(sRow);"," }"," result.push_back(s);"," return;"," }",""," //for each column"," for (int col = 0; col \u003c n; col++) {"," //if the current column is valid"," if (isValid(col, currentRow, solution) ) {"," //place the Queue"," solution[currentRow] = col;"," //recursively put the Queen in next row"," solveNQueensRecursive(n, currentRow+1, solution, result);"," }"," } ","}","","//Attempting to put the 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vector\u003cstring\u003e \u003e result = solveNQueens(n);"," printMatrix(result);"," "," return 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