题解 | #合并表记录#

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

int main() {
    int n = 0;
    cin >> n;
    map<int, int> table;
    int a = 0, b = 0;
    for (int i = 0; i < n; ++i) {
        cin >> a >> b;
        table[a] += b;
    }

    for (auto& data : table) {
        cout << data.first << " " << data.second << "\n";
    }

}
// 64 位输出请用 printf("%lld")