Submission #1155415

#	Time	Username	Problem	Language	Result	Execution time	Memory
1155415		Ludissey	Cop and Robber (BOI14_coprobber)	C++20	0 / 100	73 ms	39492 KiB

coprobber

#include "coprobber.h"
#include <bits/stdc++.h>
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
 
using namespace std;

vector<vector<int>> neigh;
vector<vector<vector<int>>> visited;
vector<vector<int>> nxt;
int pos=0;

int dfs(int p, int b, bool t){
    if(p==b) return 2;
    if(visited[p][b][t]>0) return visited[p][b][t];
    visited[p][b][t]=1;
    if(t){
        int mx=0;
        int mxI=0;
        for (auto np : neigh[p])
        {
            int d=dfs(np, b, false);
            if(d>mx) {mx=d; mxI=np; }
        }
        int d=dfs(p, b, false);
        if(d>mx) {mx=d; mxI=p; }
        
        nxt[p][b]=mxI;
        return visited[p][b][t]=mx;
    }else{
        int mn=2;
        for (auto nb : neigh[b])
        {
            int d=dfs(p, nb, true);
            if(d<mn) {mn=d; }
        }
        return visited[p][b][t]=mn;

    }

}

int start(int N, bool A[MAX_N][MAX_N])
{
    visited.resize(N,vector<vector<int>>(N,vector<int>(2,0)));
    neigh.resize(N);
    nxt.resize(N,vector<int>(N,0));
    for (int i = 0; i < N; i++)
    {
        visited[i][i][0]=visited[i][i][1]=2;
        for (int j = 0; j < N; j++)
        {
            if(A[i][j]) { neigh[i].push_back(j); neigh[j].push_back(i); }
        }
    }
    for (int i = 0; i < N; i++)
    {
        bool b=true;
        for (int j = 0; j < N; j++)
        {
            if(i==j) continue;
            int d=dfs(i,j,1);
            if(d!=2) b=false;
        }
        if(b){
            pos=i;
            return i;
        }
    }
    return -1;
}

int nextMove(int R)
{
    return pos=nxt[pos][R];
}

• Subtask 1: 0 / 16
• Subtask 2: 0 / 14
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40