Submission #379576

#	Time	Username	Problem	Language	Result	Execution time	Memory
379576		Kubin	Cop and Robber (BOI14_coprobber)	C++17	100 / 100	908 ms	7404 KiB

coprobber

#include <bits/stdc++.h>

using namespace std;

const size_t M = 512;

int n;
bool G[M][M];
bool vis[2][M][M], win[2][M][M], lose[2][M][M];
int opt[2][M][M], deg[2][M][M], gdeg[M], vertex;

void dfs(bool t, int u, int v)
{
    vis[t][u][v] = true;
    if(t) // robber
    {
        for(int u1 = 0; u1 < n; u1++) if((u1 == u or G[u1][u]) and not vis[0][u1][v])
        {
            if(lose[1][u][v])
                win[0][u1][v] = true, opt[0][u1][v] = u;
            else if(--deg[0][u1][v] == 0)
                lose[0][u1][v] = true;
            else
                continue;
            dfs(0, u1, v);
        }
    }
    else // cop
    {
        for(int v1 = 0; v1 < n; v1++) if(G[v1][v] and not vis[1][u][v1])
        {
            if(lose[0][u][v])
                win[1][u][v1] = true, opt[1][u][v1] = v;
            else if(--deg[1][u][v1] == 0)
                lose[1][u][v1] = true;
            else
                continue;
            dfs(1, u, v1);
        }
    }
}

int start(int _n, bool _G[500][500])
{
    n = _n;
    for(int u = 0; u < n; u++)
        for(int v = 0; v < n; v++)
            G[u][v] = _G[u][v], opt[0][u][v] = opt[1][u][v] = -1;

    for(int u = 0; u < n; u++)
        for(int v = 0; v < n; v++)
            gdeg[u] += G[u][v];
    for(int u = 0; u < n; u++)
        for(int v = 0; v < n; v++)
            deg[0][u][v] = gdeg[u] + 1, deg[1][u][v] = gdeg[v];

    for(int u = 0; u < n; u++)
        win[0][u][u] = lose[1][u][u] = true;

    for(int u = 0; u < n; u++)
        if(not vis[1][u][u])
            dfs(1, u, u);

    for(int u = 0; u < n; u++)
    {
        bool all = true;
        for(int v = 0; v < n; v++)
            if(not win[0][u][v])
                all = false;
        if(all)
            return vertex = u;
    }
    return -1;
}

int nextMove(int r)
{
    return vertex = opt[0][vertex][r];
}

• Subtask 1: 16 / 16
• Subtask 2: 14 / 14
• Subtask 3: 30 / 30
• Subtask 4: 40 / 40