#include#include #define N 8int column[N+1]; // 同栏是否有皇后，1表示有int rup[2*N+1]; // 右上至左下是否有皇后int lup[2*N+1]; // 左上至右下是否有皇后int queen[N+1] = {0};int num; // 解答编号void backtrack(int); // 递回求解int main(void) { int i; num = 0; for(i = 1; i <= N; i++) column[i] = 1; for(i = 1; i <= 2*N; i++) rup[i] = lup[i] = 1; backtrack(1); return 0;}void showAnswer() { int x, y; printf("\n解答 %d\n", ++num); for(y = 1; y <= N; y++) { for(x = 1; x <= N; x++) { if(queen[y] == x) { printf(" Q"); } else { printf(" ."); } } printf("\n"); }}void backtrack(int i) { int j; if(i > N) { showAnswer(); } else { for(j = 1; j <= N; j++) { if(column[j] == 1 && rup[i+j] == 1 && lup[i-j+N] == 1) { queen[i] = j; // 设定为占用 column[j] = rup[i+j] = lup[i-j+N] = 0; backtrack(i+1); column[j] = rup[i+j] = lup[i-j+N] = 1; } } }}
http://www.oschina.net/code/snippet_234517_12132