Submission #1073256

#	Time	Username	Problem	Language	Result	Execution time	Memory
1073256		fv3	Catfish Farm (IOI22_fish)	C++17	0 / 100	828 ms	2097152 KiB

fish

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

using namespace std;
typedef long long ll;

int N, M;
vector<vector<ll>> ps, dp;

ll get_score(int l, int r, int hl, int hr)
{
    if (l < 0) return -(1ll << 59);
    if (l == r - 2)
        return dp[l][hl] + ps[r-1][max(hl, hr)];
    else
    {
        if (hr < hl)
            return dp[l][hl] + ps[r][hl] - ps[r][hr];
        else
            return dp[l][hl] + ps[r-1][hr] - ps[r-1][hl];
    }
}

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

    const int mxN = max(N, 9);

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

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

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

    for (int r = 1; r < N; r++)
    {
        for (int hr = 0; hr < mxN; hr++)
        {
            ll mx = ps[r-1][hr];
            for (int hl = 0; hl < mxN; hl++)
                mx = max(mx, get_score(r-2, r, hl, hr));
            for (int hl = 0; hl < mxN; hl++)
                mx = max(mx, get_score(r-1, r, hl, hr));    

            dp[r][hr] = mx;
            res = max(res, dp[r][hr] + ps[r+1][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