题解 | #合并表记录#

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

int main() {
   map<int, int> obj;
   int length = 0;
   cin >> length;
   for(int i =0; i< length; ++i)
   {
    int tempkey = 0;
    int tempvalue = 0;
    cin >> tempkey;
    cin>> tempvalue;
    pair temppair = make_pair(tempkey, tempvalue);
    if(!obj[tempkey])
    {
        obj[tempkey] = tempvalue;
    }
    else {
        obj[tempkey] += tempvalue;
    }
   }

     for (map<int,int>::iterator it = obj.begin(); it != obj.end(); it++)
        {
            cout << it->first << " " << it->second << endl;
        }
  
}
// 64 位输出请用 printf("%lld")