归类了 OJ,整理了一下

This commit is contained in:
Fengyi Chen
2024-02-15 22:38:30 +08:00
parent 76c1ecea65
commit 8dbc0861b2
231 changed files with 0 additions and 0 deletions

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@ -0,0 +1,21 @@
#include <iostream>
#include <iomanip>
#include <cstring>
#include <cstdio>
#include <ctime>
using namespace std;
int main(){
int a,b,sum=0;
cin >>a>>b;
for(int i=a;i<=b;i++){
int c=i;
while(c){
if(c%10==2){
sum++;
}
c/=10;
}
}
cout <<sum;
return 0;
}