제출 #645581

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
645581		Pety	Cigle (COI21_cigle)	C++14	100 / 100	189 ms	67460 KiB

cigle

#include <bits/stdc++.h>
#define ll long long

using namespace std;

const int INF = 1e9;
const int MOD = 1e9 + 7;

int dp[5002][5002], sum[5002], n, pref[5002];

int main () 
{
  ios_base::sync_with_stdio(false);
  cin.tie(0); cout.tie(0);
  cin >> n;
  for (int i = 1; i <= n; i++) {
    int a;
    cin >> a;
    sum[i] = sum[i - 1] + a;
  }
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j < i; j++)
      pref[j] = max(pref[j - 1], dp[j][i - 1]);
    int matches = 0;
    int ind = i - 1, best = pref[i - 1];
    for (int j = i; j <= n; j++) {
      dp[i][j] = best;
      while (ind > 0 && sum[j] - sum[i - 1] > sum[i - 1] - sum[ind]) 
        ind--;
      if (ind && sum[j] - sum[i - 1] == sum[i - 1] - sum[ind]) {
        matches++;
        best = max(best, matches + pref[ind]);
      }
    }
  }
  int mx = 0;
  for (int i = 1; i <= n; i++)
    mx = max(mx, dp[i][n]);
  cout << mx << "\n";
  return 0;
}

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