请点击我

#include <iostream>
#include <vector>
#include <cmath>
#include <iomanip>
using namespace std;
const int MAX = 2000005; 
vector<int> cnt(MAX,0);
int main(){
    int n;
    cin>>n;
    while(n--){
        double a;
        int t;
        cin>>a>>t;
        for(int k=1;k<=t;++k){
            int num=floor(k*a); 
            cnt[num]++;
        }
    }
    for (int i=1;i<MAX;i++) {
        if(cnt[i]%2==1){
            cout<<i<<endl;
            break;
        }
    }
    return 0;
}