Submission #146194

#	Time	Username	Problem	Language	Result	Execution time	Memory
146194		imeimi2000	Bigger segments (IZhO19_segments)	C++17	100 / 100	106 ms	13048 KiB

segments

#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;
typedef long long llong;

int n;
llong S[500001];
int M[500002];
int D[500001];

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n;
    for (int i = 1; i <= n; ++i) {
        cin >> S[i];
        S[i] += S[i - 1];
    }
    for (int i = 1; i <= n; ++i) {
        M[i] = max(M[i], M[i - 1]);
        D[i] = D[M[i]] + 1;
        llong V = (S[i] << 1) - S[M[i]];
        int s = i + 1, e = n + 1;
        while (s < e) {
            int m = (s + e) / 2;
            if (V <= S[m]) e = m;
            else s = m + 1;
        }
        M[s] = max(M[s], i);
    }
    printf("%d\n", D[n]);
    return 0;
}

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