Submission #465733

#	Time	Username	Problem	Language	Result	Execution time	Memory
465733		MohamedFaresNebili	Portals (BOI14_portals)	C++14	70 / 100	1079 ms	5572 KiB

portals

#include <bits/stdc++.h>

using namespace std;

void solve()
{
    /// JUST KEEP GOING
    const int nx[4] = {0, 0, 1, -1}, ny[4] = {1, -1, 0, 0};
    int n, m; cin>>n>>m; char grid[n][m]; int d[n][m];
    int sx, sy; int ex, ey;
    for(int l=0;l<n;l++) {
        for(int i=0;i<m;i++) {
            cin>>grid[l][i]; d[l][i]=1000000000;
            if(grid[l][i]=='S') {
                sx=l; sy=i; d[sx][sy]=0;
            }
            else if(grid[l][i]=='C') {
                ex=l; ey=i;
            }
        }
    }
    queue<pair<int, int>>q; q.push({sx, sy});
    while(!q.empty()) {
        int a=q.front().first, b=q.front().second; q.pop(); bool wall=false;
        for(int l=0;l<4;l++) {
            int x=a+nx[l], y=b+ny[l];
            if(x<0||x>=n||y<0||y>=m||grid[x][y]=='#') {
                wall=true; continue;
            }
            if(d[x][y]>d[a][b]+1) {
                d[x][y]=d[a][b]+1; q.push({x, y});
            }
        }
        int p=1000000000;
        if(!wall) {
            for(int l=0;l<4;l++) {
                int x=a, y=b; int k=0;
                while(x>=0&&y>=0&&x<n&&y<m&&grid[x][y]!='#') {
                    x+=nx[l]; y+=ny[l]; k++;
                }
                x-=nx[l]; y-=ny[l];
                p=min(p, k);
            }
        }
        else p=1;
        for(int l=0;l<4;l++) {
            int x=a, y=b;
            while(x>=0&&y>=0&&x<n&&y<m&&grid[x][y]!='#') {
                x+=nx[l]; y+=ny[l];
            }
            x-=nx[l], y-=ny[l];
            if(d[x][y]>d[a][b]+p) {
                d[x][y]=d[a][b]+p; q.push({x, y});
            }
        }
    }
    cout<<d[ex][ey]<<'\n';
}

int32_t main()
{

    int t; t=1;
    while(t--) {
        solve();
    }
    return 0;
}

Compilation message (stderr)

portals.cpp: In function 'void solve()':
portals.cpp:57:22: warning: 'ex' may be used uninitialized in this function [-Wmaybe-uninitialized]
   57 |     cout<<d[ex][ey]<<'\n';
      |                      ^~~~
portals.cpp:57:22: warning: 'ey' may be used uninitialized in this function [-Wmaybe-uninitialized]

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