谁能告诉我一下为什么要用long int 型的啊?我之前用int型的全是wa!!要急死了!!!
# include <stdio.h> int main(void) { long int ans, n; scanf("%ld",&n); ans=n * (n-1) / 2 * (n-2) / 3 * (n-3) / 4; printf("%ld\n",ans); return 0; }