题解 | #合并表记录#

C++

#include<iostream>
#include<map>
using namespace std;
int main()
{
    int num;
    cin>>num;
    int key;
    int value;
    map<int,int> mp;
    while(num--)
    {
        cin>>key;
        cin>>value;
        if(mp.find(key)!=mp.end())mp[key] += value;
        else  mp[key] = value;
    }

    for(auto i = mp.begin();i!=mp.end();++i)
    {
        cout<<(*i).first <<" "<<(*i).second<<endl;
    }
    return 0;
}