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repeat_ map mp. find() + mp. erase()

2022-04-23 00:22:00 【I'll go to bed again】 

//
#include<bits/stdc++.h>
using namespace std;

map< int,int > mp;
map< int,int >::iterator it;

int main()
{
    int n,k,x,a,b;
    while( cin>>n )
    {
        while( n-- )
        {
            cin>>a>>b;
            mp.insert( make_pair( a,b ) );
        }
        cin>>k;
        while( k-- )
        {
            cin>>x;
            it=mp.find( x );

            if( it!=mp.end() )
            {
                it=mp.erase( it );		//  Need a higher version   To get  c.erase()  Return value  eg.c++11 
                cout<<"size:"<<mp.size()<<endl;
                
                if( it!=mp.end() )  
                    cout<<it->first<<" "<<it->second<<endl;
            }
        }
    }
    return 0;
}
// 4
// 1 2 3 4 5 6 7 8
// 1
// 3
// size:3
// 5 6

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