题解 | #合并表记录#

#include <iostream>
#include <map>
using namespace std;

int main() {
    int num;
    int a, b;
    map <int,int> dates;

    cin >> num;
    while (cin >> a >> b) {
        dates[a] += b;
    }

    for(auto ite = dates.begin(); ite != dates.end(); ++ite) {
        cout << ite->first << " " << ite->second << endl;
    }
}