Submission #558538

#	Time	Username	Problem	Language	Result	Execution time	Memory
558538		Tien_Noob	Bigger segments (IZhO19_segments)	C++17	100 / 100	77 ms	13068 KiB

segments

//Make CSP great again
//Vengeance
#include <bits/stdc++.h>
#define TASK "TESTCODE"
#define Log2(x) 31 - __builtin_clz(x)
using namespace std;
const int N = 1e6;
long long a[N + 1];
int n, dp[N + 1], pre[N + 1];
void read()
{
    cin >> n;
    for (int i = 1; i <= n; ++ i)
    {
        cin >> a[i];
        a[i] += a[i - 1];
    }
}
void solve()
{
    for (int i = 1; i <= n; ++ i)
    {
        pre[i] = max(pre[i], pre[i - 1]);
        dp[i] = dp[pre[i]] + 1;
        int j = lower_bound(a + 1, a + n + 1, 2 * a[i] - a[pre[i]]) - a;
        pre[j] = max(pre[j], i);
    }
    cout << dp[n];
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (fopen(TASK".INP", "r"))
    {
        freopen(TASK".INP", "r", stdin);
        //freopen(TASK".OUT", "w", stdout);
    }
    int t = 1;
    bool typetest = false;
    if (typetest)
    {
        cin >> t;
    }
    for (int __ = 1; __ <= t; ++ __)
    {
        //cout << "Case " << __ << ": ";
        read();
        solve();
    }
}

Compilation message (stderr)

segments.cpp: In function 'int main()':
segments.cpp:36:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |         freopen(TASK".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 10 / 10
• Subtask 4: 36 / 36
• Subtask 5: 27 / 27