Submission #494041

#	Time	Username	Problem	Language	Result	Execution time	Memory
494041		goodluck2020	Portals (BOI14_portals)	C++14	0 / 100	1 ms	332 KiB

portals

#include <bits/stdc++.h>
#define task "portals"

using namespace std;
const int N = 1e3 + 5;
int n, m, A[N][N];
struct Data
{
    int x, y;
} S, C, D;
int dx[] = {0, 0, 1, -1};
int dy[] = {1, -1, 0, 0};
namespace sub4
{
    queue < Data > Q;
    int Visited[N][N], dist[N][N];
    void Go(int x, int y)
    {
        Q.push({x, y});
        Visited[x][y] = 1;
        dist[x][y] = dist[D.x][D.y] + 1;
    }
    void solve()
    {
        Q.push(S); Visited[S.x][S.y] = 1;
        while(!Q.empty())
        {
            D = Q.front(); Q.pop();
            bool ok = 1;
            for(int i = 0; i < 4; i++)
            {
                int x = D.x + dx[i];
                int y = D.y + dy[i];
                if(A[x][y] && !Visited[x][y]) Go(x, y);
                ok &= A[x][y];
            }
            if(!ok)
            {
                int x, y;
                x = D.x; y = D.y;
                while(A[x][y])
                {
                    if(A[x-1][y] && !Visited[x][y]) Go(x, y);
                    x--;
                }
                x = D.x; y = D.y;
                while(A[x][y])
                {
                    if(A[x+1][y] && !Visited[x][y]) Go(x, y);
                    x++;
                }
                x = D.x; y = D.y;
                while(A[x][y])
                {
                    if(A[x][y - 1] && !Visited[x][y]) Go(x, y);
                    y--;
                }
                x = D.x; y = D.y;
                while(A[x][y])
                {
                    if(A[x][y + 1] && !Visited[x][y]) Go(x, y);
                    y++;
                }
            }
        }
        cout << dist[C.x][C.y];
    }
}
int main()
{
    if(fopen(task ".inp","r"))
    {
        freopen(task ".inp","r",stdin);
        freopen(task ".out","w",stdout);
    }
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n >> m;
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= m; j++)
        {
            char ch;
            cin >> ch;
            if(ch == 'S') S = {i, j};
            if(ch == 'C') C = {i, j};
            if(ch != '#') A[i][j] = 1;
        }
    if(n <= 200 && m <= 200) sub4::solve();
}

Compilation message (stderr)

portals.cpp: In function 'int main()':
portals.cpp:73:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |         freopen(task ".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
portals.cpp:74:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |         freopen(task ".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 19
• Subtask 5: 0 / 30