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Problem on 2nd test of "Kefa and First Steps"

 2 years ago
source link: http://codeforces.com/blog/entry/99014
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I write 3, 2, 2, 9, and I get 3 from my compiler. But in the second test on Codeforces, it gets 0. I can't understand why. 

#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n, ans = 1;
    scanf("%d", &n);
    int a[n];
    vector <int> s;
    for(int i = 0; i < n; i++){
        scanf("%d", &a[i]);
    }
    for(int i = 0; i <= n - 1; i++){
        if(a[i] <= a[i + 1]){
            ans++;
        }
        else{
            s.push_back(ans);
            ans = 1;
        }
    }
    int size = s.size();
    int mx = 0;
    for(int i = 0; i < size; i++){
        if(s[i] >= mx){
            mx = s[i];
        }
    }
    cout << mx;
    return 0;
}

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