ld_k_s @ 2019-08-01 15:37:26
#include <bits/stdc++.h>
using namespace std;
int main() {
int t;
cin >> t;
for (int i = 0; i < t; i++) {
int n, a, c = 0;
cin >> n >> a;
long long s = 1;
for (int j = 1; j <= n; j++) {
s *= j;
}
while (s != 0) {
if (s % 10 == a) {
c++;
}
s /= 10;
}
cout << c << endl;
}
return 0;
}
by Pine_applee @ 2020-01-07 15:59:24
高精