Canguros Problema Preselectivo

Canguros.cpp

#include <iostream>
#include <queue>
#define op_io ios_base::sync_with_stdio(0);cin.tie(0);
using namespace std;

int main(){
    op_io
    int n,c;
    cin>>c>>n;
    char comando;
    long long actual;
    queue<long long> canguros;
    while(n--){
        cin>>comando;
        switch(comando){
        case 'N':
            cin>>actual;
            canguros.push(actual);
            break;
        case 'A':
            c-=canguros.front() + 1;
            canguros.pop();
            break;
        case 'C':
            cout << canguros.size() << "\n";
            break;
        case 'R':
            cout << c << "\n";
            break;
        }
    }
    return 0;
}