统一单位再判断

#include<bits/stdc++.h>
using namespace std;
long long change(long long size,string t){  //统一单位
    if(t == "B") return size;  
    else if(t == "KB") return size * 1000;  
    else if(t == "MB") return size * 1000 * 1000;
    else if(t == "GB") return size * 1000 * 1000 * 1000;
}
int main() {  
    int n; cin >> n;  
    long long maxx = -1;  
    string ans,te;  
    long long curs;  
    for(int i = 1;i <= n;i++){  
        cin >> curs >> te;  
        long long cur = change(curs,te);  
        if(cur > maxx){
            maxx = cur;
            ans = te;
        }
    }
    if (ans == "GB") cout << maxx / (1000 * 1000 * 1000) << " GB";
    else if (ans == "MB") cout << maxx / (1000 * 1000) << " MB";
    else if (ans == "KB") cout << maxx / 1000 << " KB";
    else if (ans == "B") cout << maxx << " B";
    return 0;  
}