Submission #830559

#	Time	Username	Problem	Language	Result	Execution time	Memory
830559		NeroZein	Catfish Farm (IOI22_fish)	C++17	14 / 100	1165 ms	2097152 KiB

fish

#include "fish.h"
#include <bits/stdc++.h>
#include <vector>

using namespace std;

const int N = 3003;
int n; 
long long dp[N][N][2][2]; 
vector<vector<int>> a;

long long bt(int col, int last, bool me, bool recent) {
  if (col > n) {
    return 0;
  }
  if (last > n || last < 0) {
    return -1e16;
  }
  long long& ret = dp[col][last][me][recent];
  if (ret != -1) {
    return ret;
  }
  if (me) {
    ret = max(bt(col, last - 1, me, recent) + a[col][last],
              bt(col + 1, last, me ^ (last == 0), (last == 0)));
  } else {
    ret = max(bt(col, last + 1, me, recent) + a[col - 1][last] * (recent == false), 
              bt(col + 1, last, me ^ (last == n), false));      
  }; 
  return ret;
}

long long max_weights(int N_, int M, vector<int> X, vector<int> Y, vector<int> W) {
  n = N_; 
  a.resize(n + 1);
  for (int i = 0; i <= n; ++i) {
    a[i].resize(n + 1); 
  }
  for (int i = 0; i < M; ++i) {
    a[X[i] + 1][Y[i] + 1] = W[i];
  }
  memset(dp, -1, sizeof dp);
  return bt(1, 0, 0, 0);
}

• 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