[백준] 10833번 : 사과 - C++

https://www.acmicpc.net/problem/10833

#include <iostream>

using namespace std;

int main() {
    int n,a,b;
    cin>>n;
    int sum=0;
    for(int i=0;i<n;i++){
        cin>>a>>b;
        sum+=b%a;
    }
    cout<<sum;
}