Submission #1092050

#	Time	Username	Problem	Language	Result	Execution time	Memory
1092050		juicy	Bigger segments (IZhO19_segments)	C++17	100 / 100	51 ms	13140 KiB

segments

#include <bits/stdc++.h>

using namespace std;

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

const int N = 5e5 + 5;

int n;
int res[N], lst[N];
long long a[N];

int main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);

  cin >> n;
  for (int i = 1; i <= n; ++i) {
    cin >> a[i];
  }
  partial_sum(a, a + n + 1, a);
  for (int i = 1; i <= n; ++i) {
    long long x = a[i] - a[lst[i]];
    res[i] = res[lst[i]] + 1;
    int l = i + 1, r = n, p = -1;
    while (l <= r) {
      int m = (l + r) / 2;
      if (a[m] - a[i] >= x) {
        p = m;
        r = m - 1;
      } else {
        l = m + 1;
      }
    }
    if (~p) {
      lst[p] = max(lst[p], i);
    }
    lst[i + 1] = max(lst[i + 1], lst[i]);
  }
  cout << res[n];
  return 0;
}

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