hdu 4288 Coder 一个很水的版本 >_<

#include <iostream>
#include <vector>
#include <cstring>
#include <cstdio>
#include <algorithm>

using namespace std;

char s[5];
int n;
vector<int> a;

int main(){
//freopen("sum.in","r",stdin);
int len,val;
vector<int>::iterator it;
while(cin>>n){
len = 0;
a.clear();
while(n--){
scanf("%s",s);
if(s[0]=='s'){
long long ans = 0;
for(int i=2;i<len;i+=5)
ans += a[i];
cout<<ans<<endl;
}
else if(s[0]=='a'){
len++;
scanf("%d",&val);
it = lower_bound(a.begin(),a.end(),val);
a.insert(it,val);
}
else{
len--;
scanf("%d",&val);
it = lower_bound(a.begin(),a.end(),val);
a.erase(it);
}
}
}
return 0;
}