Submission #872196

#	Time	Username	Problem	Language	Result	Execution time	Memory
872196		Ludissey	Catfish Farm (IOI22_fish)	C++17	23 / 100	1088 ms	109832 KiB

fish

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

map<pair<int,pair<int,int>>, int> memo;
int N,M;
int dp(int x, int last, int lastlast){
  if(memo.find({x,{last,lastlast}})!=memo.end()) return memo[{x,{last,lastlast}}];
  if(x==N) return 0;
 
  memo[{x,{last,lastlast}}] = 0;
  for (auto i:fsh[x])
  {
    int c=dp(x+1, i, last);
    if(x>0){
      for (auto y:cfsh[x-1]) {
        if(y>last&&y<=max(i,lastlast)) c+=a[{x-1,y-1}];
      }
    }
    if(x==N-1) for (int y = i; y < last; y++) c+=a[{x,y}];
    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; 
  fsh.resize(N+1, vector<int>(1,0));
  cfsh.resize(N+1);
  for (int i = 0; i < M; i++){
    a[{X[i],Y[i]}] = W[i];

    fsh[X[i]+1].push_back(Y[i]+1);
    cfsh[X[i]].push_back(Y[i]+1);
    if(X[i]>0) {
      fsh[X[i]-1].push_back(Y[i]+1);
    }
  }
  for (int i = 0; i < N; i++) sort(fsh[i].begin(),fsh[i].end());
  
  int p=dp(0,0,0);
  return p;
}

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