Submission #769933

#	Time	Username	Problem	Language	Result	Execution time	Memory
769933		Jomnoi	Bigger segments (IZhO19_segments)	C++17	27 / 100	1569 ms	66444 KiB

segments

#include <bits/stdc++.h>
using namespace std;

const int MAX_N = 3005;
const long long INF = 1e18 + 7;

long long A[MAX_N], dp[MAX_N][MAX_N];

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);

    int N;
    cin >> N;

    for (int i = 1; i <= N; i++) {
        cin >> A[i];

        A[i] += A[i - 1];
    }

    int ans = 1;
    for (int i = 1; i <= N; i++) dp[i][0] = INF;
    for (int i = 1; i <= N; i++) dp[1][i] = A[i];
    for (int s = 2; s <= N; s++) {
        for (int i = 1; i <= N; i++) {
            dp[s][i] = INF;
            for (int j = i; j >= 1; j--) {
                if (dp[s - 1][j - 1] <= A[i] - A[j - 1]) {
                    dp[s][i] = A[i] - A[j - 1];
                    break;
                }
            }
            // int l = 1, r = i, pos = -1;
            // while (l <= r) {
            //     int mid = (l + r) / 2;

            //     if (dp[s - 1][mid - 1] == INF) l = mid + 1;
            //     else if (dp[s - 1][mid - 1] <= A[i] - A[mid - 1]) l = mid + 1, pos = mid;
            //     else r = mid - 1;
            // }
            // if (pos != -1) dp[s][i] = A[i] - A[pos - 1];
        }

        if (dp[s][N] == INF) break;
        ans = s;
    }
    cout << ans;
    return 0;
}

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