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Submission #465771

# Submission time Handle Problem Language Result Execution time Memory
465771 2021-08-16T18:30:41 Z MohamedFaresNebili Portals (BOI14_portals) C++14
100 / 100
 638 ms 52292 KB 
#include <bits/stdc++.h>

using namespace std;

void solve()
{
    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 sx, sy, ex, ey; int d[n][m]; set<int>h[m], v[n];
    for(int l=0;l<m;l++) {
        h[l].insert(-1); h[l].insert(n);
    }
    for(int l=0;l<n;l++) {
        v[l].insert(-1); v[l].insert(m);
    }
    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[l][i]=0; }
            if(grid[l][i]=='C') { ex=l; ey=i; }
            if(grid[l][i]=='#') {
                h[i].insert(l);
                v[l].insert(i);
            }
        }
    }
    priority_queue<pair<int, pair<int, int>>>pq; pq.push({0, {sx, sy}});
    while(!pq.empty()) {
        int a=pq.top().second.first, b=pq.top().second.second, w=-pq.top().first; pq.pop();
        if(a==ex&&b==ey) { cout<<w<<'\n'; return; }
      	if(d[a][b]<w) continue;
        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]=='#') continue;
            if(d[x][y]>d[a][b]+1) {
                d[x][y]=d[a][b]+1; pq.push({-d[x][y], {x, y}});
            }
        }
        auto i=h[b].lower_bound(a), j=h[b].upper_bound(a), u=v[a].lower_bound(b), k=v[a].upper_bound(b); i--; u--;
        int p=min({*j-a, a-*i, *k-b, b-*u});
        int a1=*i+1, aa=*j-1, b1=*u+1, bb=*k-1;
        if(a1>=0&&a1<n&&grid[a1][b]!='#') {
            if(d[a1][b]>d[a][b]+p) {
                d[a1][b]=d[a][b]+p;
                pq.push({-d[a1][b], {a1, b}});
            }
        }
        if(aa>=0&&aa<n&&grid[aa][b]!='#') {
            if(d[aa][b]>d[a][b]+p) {
                d[aa][b]=d[a][b]+p;
                pq.push({-d[aa][b], {aa, b}});
            }
        }
        if(b1>=0&&b1<m&&grid[a][b1]!='#') {
            if(d[a][b1]>d[a][b]+p) {
                d[a][b1]=d[a][b]+p;
                pq.push({-d[a][b1], {a, b1}});
            }
        }
        if(bb>=0&&bb<m&&grid[a][bb]!='#') {
            if(d[a][bb]>d[a][b]+p) {
                d[a][bb]=d[a][b]+p;
                pq.push({-d[a][bb], {a, bb}});
            }
        }
    }
}

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

Compilation message

portals.cpp: In function 'void solve()':
portals.cpp:30:9: warning: 'ex' may be used uninitialized in this function [-Wmaybe-uninitialized]
   30 |         if(a==ex&&b==ey) { cout<<w<<'\n'; return; }
      |         ^~
portals.cpp:30:17: warning: 'ey' may be used uninitialized in this function [-Wmaybe-uninitialized]
   30 |         if(a==ex&&b==ey) { cout<<w<<'\n'; return; }
      |            ~~~~~^~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 0 ms 280 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 0 ms 204 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 16 ms 2124 KB Output is correct
6 Correct 17 ms 2044 KB Output is correct
7 Correct 14 ms 1740 KB Output is correct
8 Correct 11 ms 1780 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 16 ms 2128 KB Output is correct
15 Correct 18 ms 1932 KB Output is correct
16 Correct 13 ms 1740 KB Output is correct
17 Correct 17 ms 1884 KB Output is correct
18 Correct 14 ms 1404 KB Output is correct
19 Correct 4 ms 460 KB Output is correct
20 Correct 7 ms 556 KB Output is correct
21 Correct 16 ms 2088 KB Output is correct
22 Correct 16 ms 2060 KB Output is correct
23 Correct 18 ms 1868 KB Output is correct
24 Correct 9 ms 572 KB Output is correct
25 Correct 0 ms 204 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 0 ms 204 KB Output is correct
28 Correct 11 ms 1780 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 16 ms 2124 KB Output is correct
15 Correct 17 ms 1996 KB Output is correct
16 Correct 13 ms 1856 KB Output is correct
17 Correct 16 ms 1812 KB Output is correct
18 Correct 14 ms 1372 KB Output is correct
19 Correct 3 ms 460 KB Output is correct
20 Correct 7 ms 552 KB Output is correct
21 Correct 15 ms 2084 KB Output is correct
22 Correct 16 ms 2064 KB Output is correct
23 Correct 17 ms 1972 KB Output is correct
24 Correct 613 ms 35304 KB Output is correct
25 Correct 296 ms 5696 KB Output is correct
26 Correct 83 ms 5452 KB Output is correct
27 Correct 163 ms 5700 KB Output is correct
28 Correct 602 ms 45816 KB Output is correct
29 Correct 630 ms 44360 KB Output is correct
30 Correct 638 ms 43324 KB Output is correct
31 Correct 9 ms 460 KB Output is correct
32 Correct 234 ms 5708 KB Output is correct
33 Correct 0 ms 204 KB Output is correct
34 Correct 1 ms 332 KB Output is correct
35 Correct 352 ms 29044 KB Output is correct
36 Correct 0 ms 204 KB Output is correct
37 Correct 11 ms 1780 KB Output is correct
38 Correct 385 ms 36864 KB Output is correct
39 Correct 393 ms 52292 KB Output is correct