题解 | #合并表记录#

#include<iostream>
#include<map>
#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

int main()
{
	map<int, int>maps;
	int n;
	cin >> n;
	map<int, int>::iterator it;
	for (int i = 1; i <= n; ++i)
	{
		int k, v;
		cin >> k >> v;
		maps[k] += v;
		//maps[k] += v;
	}
	for (auto c : maps)
		cout << c.first << " " << c.second << endl;
	/*for (it=maps.begin();it!=maps.end();it++)
	{
		cout << it->first << " " << it->second << endl;
	}*/
	return 0;
}