题解 | #合并表记录#

#include <iostream>
#include <map>
using namespace std;
void GetResult();

int main() {
    #if 0
    int a, b;
    while (cin >> a >> b) { // 注意 while 处理多个 case
        cout << a + b << endl;
    }
    #endif
    GetResult();
    return 0;
}
// 64 位输出请用 printf("%lld")
void GetResult()
{
    map<int, int> maps;
    int cnt = 0;
    int idx = 0;
    int val = 0;
    cin >> cnt;
    for(int i=0; i<cnt; i++)
    {
        cin >> idx;
        cin >> val;
        maps[idx] += val;
    }
    
    auto mapiter = maps.begin();
    while(mapiter !=maps.end())
    {
        //cout << "hello";
        cout << mapiter->first <<" "<<mapiter->second <<endl;
        mapiter++;
    }
}