Submission #643979

#	Time	Username	Problem	Language	Result	Execution time	Memory
643979		NintsiChkhaidze	Catfish Farm (IOI22_fish)	C++17	0 / 100	771 ms	151408 KiB

fish

#include "fish.h"
#include <bits/stdc++.h>
#define ll long long
using namespace std;

const int N = 3005;
ll p[N][N],dp[N][N][5],suff[N][N];

ll max_weights(int n, int m, vector<int> X, vector<int> Y, vector<int> W) {

  for (int i = 0;i < m; i++){
    X[i]++,Y[i]++;
    p[X[i]][Y[i]] += W[i];
  }

  for (int j = 1; j <= n; j++)
    for (int i = 1; i <= n; i++)
      p[j][i] += p[j][i - 1];

  for (int j = 2; j <= n; j++){
    for (int a = 0; a <= n; a++){
      
      //update dp[j][a][0]
      for (int b = a; b <= n; b++){
        ll v = suff[j - 1][b];
        dp[j][a][0] = max(dp[j][a][0], v - p[j][a]);
      }

      //update dp[j][a][1]
      for (int b = 0; b <= a; b++){
        ll v = dp[j - 1][b][1] - p[j - 1][b];
        dp[j][a][1] = max(dp[j][a][1], v + p[j - 1][a]);
      }
      
      //c 0 a
      if (j >= 3){ 
        for (int c = 0; c <= n; c++){
          ll v = max(dp[j - 2][c][0],dp[j - 2][c][1]);
          dp[j][a][1] = max(dp[j][a][1], v + p[j - 1][max(a,c)]);
        }
      }
      
    }

    for (int a = n; a >= 0; a--)
      suff[j][a] = max(suff[j][a + 1],max(dp[j][a][0],dp[j][a][1]) + p[j + 1][a]);

    
  }

  ll ans = 0;
  for (int a = 0; a <= n; a++)
      ans=max(ans,max(dp[n][a][0],dp[n][a][1]));
  return ans;
}

• Subtask 1: 0 / 3
• Subtask 2: 0 / 6
• Subtask 3: 0 / 9
• Subtask 4: 0 / 14
• Subtask 5: 0 / 21
• Subtask 6: 0 / 17
• Subtask 7: 0 / 14
• Subtask 8: 0 / 16