SOAM TS10 PTNK 2007-2008

#define task "SOAM"

#include <iostream>
#include <cstdio>

using namespace std;

using ll = long long;
using ld = long double;

constexpr int N = 1e5 + 5;
int n, a[N];

void Read()
{
    cin >> n;

    for (int i = 1; i <= n; ++i)
        cin >> a[i];
}

void Solve()
{
    int ans(-N);

    for (int i = 1; i <= n; ++i)
        if (a[i] >= 0)
            ; // Bỏ qua
        else
            ans = max(ans, a[i]);

    if (ans == -N) // Không có số âm trong dãy
        cout << 0;
    else
        cout << ans;
}

int32_t main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    if (fopen(task ".INP", "r"))
    {
        freopen(task ".INP", "r", stdin);
        freopen(task ".OUT", "w", stdout);
    }

    Read();
    Solve();
}