数据结构 C 代码 6.3: N 后问题

摘要: N 后问题说明, 一山不容二只母老虎.

先上代码, 再说废话.

#include 
#include 
#include 


bool place(int* paraSolution, int paraT){
	int j;
    for (j = 1; j < paraT; j ++){
        if ((abs(paraT - j) == abs(paraSolution[j] - paraSolution[paraT])) || (paraSolution[j] == paraSolution[paraT]))
            return false;
    }//Of for
    return true;
}//Of place


void backtracking(int* paraSolution, int paraN, int paraT){
	int i;
    if (paraT > paraN){
        for (i = 1; i <= paraN; i ++)
            printf("%d ", paraSolution[i]);
		printf("rn");
    }else{
        for (i = 1; i <= paraN; i ++){
            paraSolution[paraT] = i;
            if (place(paraSolution, paraT))
                backtracking(paraSolution, paraN, paraT + 1);
        }//Of for i
    }//Of if
}//Of backtracking


void nQueen(int paraN){
	int i;
	int* solution = (int*)malloc((paraN + 1) * sizeof(int));
	for (i = 0; i <= paraN; i ++)
		solution[i] = 0;

    backtracking(solution, paraN, 1);
}//Of nQueen


int main(){
	nQueen(5);
	return 1;
}//Of main

1 3 5 2 4
1 4 2 5 3
2 4 1 3 5
2 5 3 1 4
3 1 4 2 5
3 5 2 4 1
4 1 3 5 2
4 2 5 3 1
5 2 4 1 3
5 3 1 4 2
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1. 回溯算法是万能解题法.
2. 回溯法的框架都是一致的.