Submission #420706

#	Time	Username	Problem	Language	Result	Execution time	Memory
420706		rama_pang	Cigle (COI21_cigle)	C++17	100 / 100	324 ms	98400 KiB

cigle

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

int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);

  int N;
  cin >> N;
  vector<int> A(N);
  for (int i = 0; i < N; i++) {
    cin >> A[i];
  }

  vector<vector<int>> dp(N, vector<int>(N));

  for (int mid = N - 1; mid >= 1; mid--) {
    for (int i = N - 1; i >= mid; i--) {
      if (i + 1 < N) {
        dp[mid][i] = max(dp[mid][i], dp[mid][i + 1]);
      }
      if (mid + 1 < N) {
        dp[mid][i] = max(dp[mid][i], dp[mid + 1][i]);
      }
    }
    // [mid - 1, mid] as splitting point
    int sumLft = 0;
    int sumRgt = 0;
    int cost = 0;
    int ptr = mid;
    for (int i = mid - 1; i >= 0; i--) {
      sumLft += A[i];
      while (ptr < N && sumRgt < sumLft) {
        sumRgt += A[ptr];
        ptr += 1;
      }
      cost += (sumLft == sumRgt);
      if (i > 0 && ptr < N) {
        dp[i - 1][mid - 1] = max(dp[i - 1][mid - 1], dp[mid][ptr] + cost);
      }
    }
  }

  int ans = 0;
  for (int i = 0; i < N; i++) {
    ans = max(ans, dp[0][i]);
  }

  cout << ans << '\n';
  return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 11 / 11
• Subtask 3: 13 / 13
• Subtask 4: 15 / 15
• Subtask 5: 52 / 52