Submission #1053306

#	Time	Username	Problem	Language	Result	Execution time	Memory
1053306		Zbyszek99	Cop and Robber (BOI14_coprobber)	C++17	0 / 100	42 ms	17072 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 rob,police,move;
};

//   DP[police][robber][turn]
bool DP[MAX_N][MAX_N][2];
int zlicz[MAX_N][MAX_N][2];
int where_go[MAX_N][MAX_N];
vector<dp> graf2[MAX_N][MAX_N][2];

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)
    {
        rep(j,0,n-1)
        {
            for(auto& it: graf[j])
            {
                zlicz[i][j][1]++;
            }
            zlicz[i][j][0] = 0;
        }
    }
    rep(i,0,n-1)
    {
        winning_pos.push({i,i,0});
        winning_pos.push({i,i,1});
        zlicz[i][i][0] = 1;
        zlicz[i][i][1] = 0;
    }
    while(!winning_pos.empty())
    {
        dp t = winning_pos.front();
        winning_pos.pop();
//        cout << t.police << " " << t.rob << " " << t.move << " win\n";
        DP[t.police][t.rob][t.move] = 1;
        if(t.move == 0)
        {
            for(auto it: graf[t.police])
            {
                zlicz[it][t.rob][1]--;
                //cout << it << " " << t.rob << " " << 1 << " " << zlicz[it][t.rob][1] << " new\n";
                if(zlicz[it][t.rob][1] == 0)
                {
                    where_go[it][t.rob] = t.police;
                    winning_pos.push({t.rob,it,1});
                }
            }
            zlicz[t.police][t.rob][1]--;
        //    cout << t.police << " " << t.rob << " " << 1 << " " << zlicz[t.police][t.rob][1] << " new\n";
            if(zlicz[t.police][t.rob][1] == 0)
            {
                where_go[t.police][t.rob] = t.police;
                winning_pos.push({t.rob,t.police,1});
            }    
        }
        if(t.move == 1)
        {
            for(auto it: graf[t.rob])
            {
                zlicz[t.police][it][0]++;
          //      cout << t.police << " " << it << " " << 0 << " " << zlicz[t.police][it][0] << " new\n";
                if(zlicz[t.police][it][0] == 1)
                {
                    winning_pos.push({it,t.police,0});
            //        where_go[t.police][it] = 
                }
            }
        }
    }
    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;
//     }
// }

Compilation message (stderr)

coprobber.cpp: In function 'int start(int, bool (*)[500])':
coprobber.cpp:41:23: warning: unused variable 'it' [-Wunused-variable]
   41 |             for(auto& it: graf[j])
      |                       ^~

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