luogu【P1179】数字统计

思路：水题 晚自习结束前三分钟打的QwQ

#include<iostream>#include<cstdio>#include<cstring>using namespace std;int ans;int div(int n){int t;while(n){t=n%10;n/=10;if (t==2) ans++;}}int main(){int l,r;cin>>l>>r;for (int i=l;i<=r;i++){div(i);}cout<<ans;}