Submission #1073209

#	Time	Username	Problem	Language	Result	Execution time	Memory
1073209		fv3	Catfish Farm (IOI22_fish)	C++17	0 / 100	1146 ms	2097152 KiB

fish

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

using namespace std;
typedef long long ll;

int N, M;
vector<int> X, Y, W;
vector<vector<ll>> ps, v, dp;

ll get_score(int l, int r, int hl, int hr)
{
    if (l < 0) return 0;
    const int mn_h = min(hl, hr);
    if (l == r - 1)
    {
        return dp[l][hl] - ps[r][mn_h] - ps[l][mn_h];
    }
    if (l == r - 2)
        return dp[l][hl] - ps[l+1][mn_h];
    return dp[l][hl];
}

ll max_weights(int N_, int M_, vector<int> X_, vector<int> Y_, vector<int> W_) 
{
    N = N_; M = M_;
    X = X_; Y = Y_; W = W_;

    ps = v = vector<vector<ll>>(N+1, vector<ll>(N));
    for (int i = 0; i < M; i++)
        v[X[i]][Y[i]] = W[i];

    for (int i = 0; i < N; i++)
    {
        ll sum = 0;
        for (int j = 0; j < N; j++)
        {
            sum += v[i][j];
            ps[i][j] = sum;
        }
    }

    dp = vector<vector<ll>>(N, vector<ll>(N));
    ll res = 0;
    for (int i = 0; i < N; i++)
    {
        dp[0][i] = ps[1][i];
        res = max(res, dp[0][i]);
    }

    for (int r = 1; r < N; r++)
    {
        for (int hr = 0; hr < N; hr++)
        {
            ll mx = max(0ll, dp[r-1][N-1] - ps[r-1][hr] - ps[r][hr]);
            for (int l = r - 3; l < r - 1; l++)
            {
                if (l < 0) continue;
                for (int hl = 0; hl < N; hl++)
                    mx = max(mx, get_score(l, r, hl, hr));
            }
            dp[r][hr] = ps[r-1][hr] + ps[r+1][hr] + mx;
            res = max(res, dp[r][hr]);
        }
    }

    return res;
}

• 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