Submission #900322

#	Time	Username	Problem	Language	Result	Execution time	Memory
900322		Perl32	Bigger segments (IZhO19_segments)	C++14	13 / 100	1 ms	348 KiB

segments

//I wrote this code 4 u <3
#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#ifdef LOCAL
#include "algo/debug.h"
#else
#define debug(...) 42
#endif

signed main(int32_t argc, char *argv[]) {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }
    vector<ll> pref(n + 1);
    partial_sum(a.begin(), a.end(), pref.begin() + 1);
    vector<int> dp(n + 1), id(n + 2);
    for (int i = 1; i <= n; ++i) {
        id[i] = max(id[i], id[i - 1]);
        dp[i] = dp[id[i]] + 1;
        int j = lower_bound(pref.begin() + 1, pref.end(), 2 * pref[i] - pref[id[i]]) - pref.begin();
        id[j] = max(id[j], i);
    }
    cout << dp[n];
}

/*

 */

• Subtask 1: 13 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27