This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
typedef int64_t ll;
int main(){
ll n;
cin >> n;
vector<ll> slots(n);
vector<ll> users(n);
for(ll i = 0; i < n; i++){
cin >> slots[i];
}
for(ll i = 0; i < n; i++){
cin >> users[i];
}
ll j = 1;
ll happy = 0;
ll stage = 0;
for(ll i = 0; i < n; i++){
if(j==i){
j++;
}
while(slots[i]!=0){
if(j==n) {stage = 1; break;}
ll x = min(slots[i], users[j]);
slots[i]-=x;
users[j]-=x;
happy+=x;
if(users[j]==0){
j++;
}
}
if(stage == 1) {
ll x = min(slots[i], users[i]);
slots[i]-=x;
users[i]-=x;
break;
}
}
happy -= accumulate(users.begin(), users.end(), ll(0));
cout << happy;
}
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