제출 #1225136

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1225136		trimkus	메기 농장 (IOI22_fish)	C++20	0 / 100	1047 ms	2162688 KiB

fish

#include "fish.h"

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

void chmax(ll& x, ll y) {
  x = max(x, y);
}

long long max_weights(int N, int M, std::vector<int> X, std::vector<int> Y,
                      std::vector<int> W) {
    vector<vector<ll>> a(N + 3, vector<ll>(N + 3));
    for (int i = 0; i < M; ++i) {
        a[X[i] + 1][Y[i] + 1] += W[i];
    }
    vector<vector<vector<ll>>> dp(N + 2, vector<vector<ll>>(N + 2, vector<ll>(2)));
    // 1 - for hi < h(i - 1)
    // 0 - for hi >= h(i - 1)
    for (int i = 2; i <= N; ++i) {
      ll res = 0;
      for (int j = N; j >= 0; --j) {
        res = max(res, max(dp[i - 1][j][0], dp[i - 1][j][1]));
        dp[i][j][1] = max(dp[i][j][1], res);
        res += a[i][j];
      }
      res = 0;
      for (int j = 0; j <= N; ++j) {
        res = max(res, dp[i - 1][j][1]);
        dp[i][j][0] = max(res, dp[i][j][0]);
      }
      res = 0;
      for (int j = 0; j <= N; ++j) {
        res = max(res + a[i - 1][j], dp[i][j][0]);
        dp[i][j][0] = max(dp[i][j][0], res);
      }

    }
    // for (int i = 1; i <= N; ++i) {
    //   for (int j = 0; j <= N; ++j) {
    //     for (int k = 0; k < 2; ++k) {
    //       cerr << dp[i][j][k] << " ";
    //     }
    //     cerr << "\n";
    //   }
    //   cerr << "\n";
    // }
    // cerr << "\n";
    ll res = 0;
    for (int i = 0; i <= N; ++i) {
      for (int k = 0; k < 2; ++k) {
        res = max(res, dp[N][i][k]);
      }
    }
    return res;
}

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