Submission #871836

#	Time	Username	Problem	Language	Result	Execution time	Memory
871836		Ludissey	Catfish Farm (IOI22_fish)	C++17	14 / 100	1077 ms	2097152 KiB

fish

#include "fish.h"
#include <bits/stdc++.h>
#define int long long
using namespace std;
vector<vector<int>> a;
vector<vector<int>> fsh;

vector<vector<int>> prefx;
vector<vector<vector<int>>> memo;
int N,M;
int dp(int x, int last, int lastlast){
  if(memo[x][last][lastlast]!=-1) return memo[x][last][lastlast];
  if(x==N) return memo[x][last][lastlast]=0;
 
  memo[x][last][lastlast] = 0;
  for (auto i:fsh[x])
  {
    int c=dp(x+1, i, last);
    if(x>0) c+=max(0LL,prefx[x-1][max(i,lastlast)]-prefx[x-1][last]);
    if(x==N-1) c+=max(0LL,prefx[x][last]-prefx[x][i]);
    memo[x][last][lastlast]=max(c, memo[x][last][lastlast]);
  }
  return memo[x][last][lastlast];
}
 
long long max_weights(signed n, signed m, std::vector<signed> X, std::vector<signed> Y, std::vector<signed> W) {
  N=n; M=m; 
  a.resize(N, vector<int>(N,0));
  fsh.resize(N+1, vector<int>(1,0));
  prefx.resize(N, vector<int>(N+1,0)); //y+1
  memo.resize(N+1, vector<vector<int>>(N+1, vector<int>(N+1,-1)));
  for (int i = 0; i < M; i++){
    a[X[i]][Y[i]] = W[i];
    fsh[X[i]+1].push_back(Y[i]+1);
    if(X[i]>0) fsh[X[i]-1].push_back(Y[i]+1);

  }
  for (int x = 0; x < N; x++)
  {
    for (int y = 0; y < N; y++)
    {
       prefx[x][y+1]=a[x][y]+prefx[x][y];
    }
  }
  
  int p=dp(0,0,0);
  return p;
}

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