0710 编程之美之N!末尾0的个数

#include<iostream> using namespace std; int main_()//解法1 { int n; while (cin >> n) { int count = 0; for (int i = 1; i <= n; ++i) { int j = i; while (j%5==0) { count++; j = j/ 5; } } cout << count << endl; } return 0; } int main()//解法2 { int n; while (cin >> n) { int count = 0; while (n) { count += n / 5; n /= 5; } cout << count << endl; } cin.get(); return 0; }