Submission #1053405

#	Time	Username	Problem	Language	Result	Execution time	Memory
1053405		Zbyszek99	Cop and Robber (BOI14_coprobber)	C++17	100 / 100	290 ms	8144 KiB

coprobber

#include <bits/stdc++.h>
#include "coprobber.h"
#define rep(i,a,b) for(int i = a; i <= b; i++)
#define pii pair<int,int>
#define pb push_back
using namespace std;

struct dp
{
    int f,s,move;
};

//   DP[police][robber][turn]
bool DP[MAX_N][MAX_N][2];
int zlicz[MAX_N][MAX_N];
int where_go[MAX_N][MAX_N];

vector<int> graf[MAX_N];
int n;
int cur_poz;

int start(int N, bool A[MAX_N][MAX_N])
{
    n = N;
    queue<dp> winning_pos;
    rep(i,0,n-1)
    {
        rep(j,0,n-1)
        {
            if(A[i][j] == 1)
            {
                graf[i].push_back(j);
            }
        }
    }
    rep(i,0,n-1)
    {
        winning_pos.push({i,i,1});
        DP[i][i][1] = true;
    }
    rep(pocz,0,n-1)
    {
        rep(kon,0,n-1)
        {
            zlicz[pocz][kon] = (int)graf[kon].size();
        }
    }
    while(!winning_pos.empty())
    {
        dp t = winning_pos.front();
        winning_pos.pop(); 
        int p = t.f;
        int k = t.s;
        if(t.move == 0)
        {
            rep(new_v,0,n-1)
            {
                if(A[new_v][k])
                {
                    zlicz[p][new_v]--;
                    if (zlicz[p][new_v] == 0 && !DP[p][new_v][1])
                    {
                        DP[p][new_v][1] = true;
                        winning_pos.push({p,new_v,1});
                    }
                }
            }    
        }
        else
        {
            if(!DP[p][k][0])
            {
                where_go[p][k] = p;
                DP[p][k][0] = true;
                winning_pos.push({p,k,0});
            }
            rep(new_v,0,n-1)
            {
                if(A[new_v][p] && !DP[new_v][k][0])
                {   
                    where_go[new_v][k] = p;
                    DP[new_v][k][0] = true;
                    winning_pos.push({new_v,k,0});
                }
            }
        }
        
    }
    rep(start,0,n-1)
    {
        bool is = true;
        rep(end,0,n-1)
        {
            if(DP[start][end][0] == false)
            {
//                cout << start << " " << end << " se\n";
                is = false;
                break;
            } 
        }
        if(is)
        {
            cur_poz = start;
            return start;
        } 
    }
    return -1;    
}

int nextMove(int R)
{
    cur_poz = where_go[cur_poz][R];
    return cur_poz;
}


// int main()
// {
//     int n;
//     cin >> n;
//     bool A[500][500];
//     rep(i,0,n-1)
//     {
//         rep(j,0,n-1)
//         {
//             cin >> A[i][j];
//         }
//     }
//     int poz = start(n,A);
//     cout << "police: " << poz << "\n";
//     if(poz == -1)
//     {
//         return 0;
//     }
//     cout << "Rob poz: ";
//     int rob;
//     cin >> rob;
//     while(poz != rob)
//     {
//         poz = nextMove(rob);
//         cout << "new poz: " << poz << "\n";
//         cout << "Rob: ";
//         cin >> rob;
//     }
// }

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