3174 含K个3的数

#include<bits/stdc++.h>
#define f(i,s,e) for(int i = s; i <= e; i++)
#define ll long long
using namespace std;
const int N = 1e3+10,inf = 0x3f3f3f3f;int main()
{int n,k,sum = 0; //sum用来统计n里有多少个3cin >> n >> k;int f1 = 0,f2 = 0; //f1 = 1说明能被19整除，f2 = 1说明n里面刚好有k个3if(n % 19 == 0) f1 = 1; //n能被19整除 while(n > 0){if(n % 10 == 3) sum++; //3出现的次数 + 1n /= 10; } if(sum == k) f2 = 1; //刚好有k个3if(f1 == 1 && f2 == 1) //两个条件同时为真cout << "YES";else cout << "NO"; return 0;
}