八皇后问题

目前仅有代码，图解后续完善（递归，回溯）

#include <stdio.h>

int place[8]={0};
int col[8]={1,1,1,1,1,1,1,1};
int up_diagonal[15]={1,1,1,1,1,1,1,1,1,1,1,1,1,1,1};
int sub_diagonal[15]={1,1,1,1,1,1,1,1,1,1,1,1,1,1,1};
int sum = 0;

void Queens(int);
void print(void);

int main(void){
	Queens(0);
	return 0;
}

void Queens(int x){
	int i;
	for(i = 0 ; i < 8 ; i ++){
		if(col[i] == 1 && up_diagonal[x-i+7] == 1 && sub_diagonal[x+i] == 1){
			place[x] = i;
			col[i] = 0;
			up_diagonal[x-i+7] = 0;
			sub_diagonal[x+i] = 0;
			if(x < 7){
				Queens(x+1);
			}else{
				sum ++;
				print();
			}
			col[i] = 1;
			up_diagonal[x-i+7] = 1;
			sub_diagonal[x+i] = 1;
		}
	}
}

void print(void){
	printf("第%d种解法：
",sum);
	int line , i , j;
	int table[8][8]={0};
	for(line = 0 ; line < 8 ; line ++){
		table[line][place[line]] = 1;
	}
	for(i = 0 ; i < 8 ; i ++){
		for(j = 0 ; j < 8 ; j ++){
			printf("%d ",table[i][j]);
		}
		printf("
");
	}
	printf("
");
}