题解 | #合并表记录#

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

int main(){
	int num, k, v;
	cin >> num;
	map<int, int>m;
	for (int i = 0; i < num; i++){
			cin >> k >> v;
			m[k] += v;		
	}
	for (auto it = m.begin(); it != m.end(); it++){
		cout << it->first << ' ' << it->second << '\n';
	}
	return 0;
}