#include <iostream> #include <fstream> #include <string.h>/** 八皇后问题递归方法实现 */ using namespace std;ofstream file;//用以计数计算结果的数目 int count = 1; /** 打印的棋盘其中打印1的位置是皇后的位置,0空位。 这里因为在控制台看不到全部,所有做了在文件中输出所有的解 */ int print_Chessboard(int chessboard[][8]) {file.open("data.txt",ofstream::app|ofstream::out);file<<"答案:"<<count<<endl;cout<<"答案:"<<count<<endl;count++;for(int row = 0; row < 8;row++){for(int column = 0;column<8;column++){file<<chessboard[row][column]<<" ";cout<<chessboard[row][column]<<" ";}file<<endl;cout<<endl;}file<<endl<<endl;cout<<endl<<endl;file.close(); } /** 参数一将棋盘信息传入函数, 参数二将要放入的皇后的行数传入 参数三将要放入的皇后的列数传入 若皇后放入成功则返回1,若失败则返回0 */ int check_Chessboard(int chessboard[][8],int row,int column) {//1、首先检查行数和列数是否已经超出棋盘的局限,若超出了//说明前边已经都符合位置,此时返回成功系数1if(row>=8){//打印结果 print_Chessboard(chessboard);return 1;}//2、检查在这一列上是否有皇后,正上方for(int i = 0; i < row;i++){if(chessboard[i][column]==1)return 0;}//3、检查在左上和右上斜对角上是否有皇后//左上45度for(int i=row-1,j=column-1;i>=0&&j>=0;i--,j--){if(chessboard[i][j]==1)return 0;}//右上45度for(int i=row-1,j=column+1;i>=0&&j<8;i--,j++){if(chessboard[i][j]==1)return 0;}//到这里说明摆放成功//摆放成功后把这个位置标记为1chessboard[row][column]=1;//循环的检查下一行的没一个位置for(int i = 0; i < 8; i++){if(check_Chessboard(chessboard,row+1,i)==0)continue;else break;}//若没有摆放成功就返回0;此时需要把该位置重新置为0chessboard[row][column]=0;return 0; } //主调函数 int main() {int chessboard[8][8];for(int i = 0; i < 8; i++){memset(chessboard,0,sizeof(chessboard));check_Chessboard(chessboard,0,i);}return 0; }
以下是运行结果,答案共有92中摆放方法
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