题解 | #合并表记录#

#include <iostream>
#include <map>

using namespace std;

int main() {
    map<int, int> my_map;
    int key_num,key,value;
    cin >> key_num;
    for (int i=0; i < key_num; i++) {
        cin >> key >> value;
        my_map[key] +=value;
    }
    
    for (const auto& record : my_map) {
        cout << record.first << " " << record.second << endl;
    }

    return 0;
}