Program Crashes When Declaring Array in C++

Asked Apr 29 '20 at 18:45

Active Apr 29 '20 at 18:45

Viewed 23 times

I have a small chunk of C++ code that involves declaring some arrays of size 200005. When I run my code, it crashes right away. However, when I change const ll MX = 200005 to const ll MX = 20005, that is, change the size of the three arrays to each be 20005 instead of 200005, my program runs without crashing. Why is this happening?

#include <iostream>
using namespace std;

typedef long long ll;
const ll MX = 200005;

int main() {
    ll n; cin >> n;
    ll x[MX], y[MX], v[MX];
    return 0;
}

asked Apr 29 '20 at 18:45

coder_jam

2

It's more data than can fit on your stack. – cigien Apr 29 '20 at 18:46
How is this possible? I've created arrays of size 1 Million and greater before! – coder_jam Apr 29 '20 at 18:46
1

It depends on the system you ran it on, and the size of the data types in the array. – cigien Apr 29 '20 at 18:47
Would using a vector support this size? – coder_jam Apr 29 '20 at 18:48
1

Oh yes, a `vector` will allocate from the heap, so you have a lot more memory to work with. – cigien Apr 29 '20 at 18:48
Thank you, I will use vector. – coder_jam Apr 29 '20 at 18:49
1

The size here is almost 5 million bytes. – Eljay Apr 29 '20 at 18:54

Program Crashes When Declaring Array in C++

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