# How to fix timeout?

my code is timing out it is on this problem

here is my code:

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

int main() {
int piles, howmanyjuicy, juicy, numinpile, sum, juicypile;
vector<int> storeAns;
cin >> piles;
sum = 0;

for(int i = 0; i < piles; i++){
cin >> numinpile;
sum = sum + numinpile;
storeAns.push_back(sum);
}

cin >> howmanyjuicy;

for(int i = 0; i < howmanyjuicy; i++){
cin >> juicy;
juicypile = 0;
for(int k = 0; k < piles; k++){
juicypile++;
if(storeAns[k] >= juicy){
cout << juicypile << "\n";
break;
}
}
}
}
``````

does anyone know how to optimize this

what do you mean?

What’s your code trying to do to solve the problem?

i just get how many piles there are, store all the sum of the piles into a vector, get how many juicy worms there are, find out where each juicy worm is by looping through to find juicypile and printing out juicypile.

It seems that the complexity of your code is too large. You’re iterating through at most 10^5 piles for every worm, which results in a total of 10^{10} observations.

how do i make it faster?

Binary search & prefix sums.

can you go a little more into detail?

Do you know what those concepts are, first of all?

no

I think it’s best if you read up on those first: