hello, I'm trying to solve this problem http://codeforces.com/problemset/problem/762/B.

and I'm getting a runtime error -1073741819, although the code gives me the correct output locally.

my submission is http://codeforces.com/contest/762/submission/24280499

my code is

#include <iostream>
#include <set>
#include <string>


using namespace std;

int main( int argc, char **argv )
{

    ios::sync_with_stdio( 0 );

    int a, b, c;
    std::cin >> a >> b >> c;

    int m;
    cin >> m;

    std::set<int> ps;
    std::set<int> us;


    std::string t;

    int p;


    for ( int i = 0; i < m; i++ ) {

        cin >> p;
        cin >> t;

        if ( t[0] == 'U' ) {
            us.insert( p );
        } else {

            ps.insert( p );
        }
    }


    int num = 0;
    int tprice = 0;


    for ( set<int>::iterator i = us.begin(); i != us.end(); i++ ) {
        if ( a > 0 ) {


            num++;
            tprice += *i;
            us.erase( i );
            a--;
        } else {
            break;
        }
    }


    for ( set<int>::iterator i = ps.begin(); i != ps.end(); i++ ) {
        if ( b > 0 ) {

            num++;
            tprice += *i;
            ps.erase( i );
            b--;
        } else {
            break;
        }
    }

    us.insert( ps.begin(), ps.end() );

    for ( set<int>::iterator i = us.begin(); i != us.end(); i++ ) {
        if ( c > 0 ) {

            num++;
            tprice += *i;
            c--;
        } else {
            break;
        }
    }


    cout << num << " " << tprice << "\n";


    return 0;
}

Locally, I'm using this compile command

g++ -O2 main.cpp -lm -o main

Any help would be appreciated.