N皇后问题
#include <stdio.h> static int upperlim, sum; void binqueen(int row, int ld, int rd) { int pos, p; if(row != upperlim) { pos = upperlim & ~(row | ld | rd); while (pos) { p = pos & -pos; pos -= p; binqueen(row+p, (ld+p)<<1, (rd+p)>>1); } } else sum++; } int main(void) { int n; scanf("%d", &n); upperlim = (1<<n) - 1; binqueen(0, 0, 0); printf("%d", sum); return 0; }
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