Hj8 consolidated statement record

describe

Data table records contain table indexes and values （int The positive integer of the range ）, Please merge records with the same table index , That is to sum the values of the same index , Output according to key Values in ascending order are output .

Input description ：

First enter the number of key value pairs
Then type in pairs of index and value value , Space off

Output description ：

Output the merged key value pairs （ Multiple lines ）

Example 1

Input ：

4
0 1
0 2
1 2
3 4

Output ：

0 3
1 2
3 4

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

int main()
{
    int n;
    map<int,int>m;
    cin>>n;// Enter the number of key value pairs 
    for(int i = 0;i<n;i++)
    {
        pair<int,int>tmp;
        cin>>tmp.first;
        cin>>tmp.second;
        if(m.find(tmp.first)!= m.end())
        {
            //m[tmp.first] += tmp.second
            m[tmp.first] += tmp.second;
        } 
        else
        {
            m[tmp.first] = tmp.second;
        }
    }
    
    for(map<int,int>::iterator it = m.begin();it != m.end();it++)
    {
        cout<<it->first<<" "<<it->second<<endl;
    }  
    
    return 0;
}