#include <bits/stdc++.h>
using namespace std;
const int INF = 2e9;
const array<int, 2> dd[4] = {{-1, 0}, {0, -1}, {1, 0}, {0, 1}};
int main() {
ios::sync_with_stdio(0), cin.tie(0);
int n, m, o[2]; cin >> n >> m;
string a[n]; for(auto &i : a) cin >> i;
vector<array<int, 2>> g[n*m];
queue<int> q;
int d[n*m];
fill(d, d + n*m, INF);
for(int i {}, u {}; i < n; ++i) {
for(int j {}; j < m; ++j, ++u) {
if(a[i][j] == 'S') o[0] = u, a[i][j] = '.';
if(a[i][j] == 'C') o[1] = u, a[i][j] = '.';
if(a[i][j] == '.') {
if(i && a[i-1][j] == '.') {
g[u-m].push_back({u, 1});
g[u].push_back({u-m, 1});
}
if(j && a[i][j-1] == '.') {
g[u-1].push_back({u, 1});
g[u].push_back({u-1, 1});
}
bool ok {};
for(auto [dx, dy] : dd) {
int x = i + dx, y = j + dy;
if(min(x, y) < 0 || x == n || y == m || a[x][y] == '#') ok = 1;
}
if(ok) q.push(u), d[u] = 0;
}
}
}
while(!empty(q)) {
int u = q.front(); q.pop();
for(auto [v, w] : g[u]) if(d[v] == INF) {
d[v] = d[u] + 1;
q.push(v);
}
}
for(int i {}, u {}; i < n; ++i) {
int last = u = i * m;
for(int j {}; j < m; ++j, ++u) if(a[i][j] == '.') {
if(j && a[i][j-1] != '.') last = u;
else
g[u].push_back({last, d[u] + 1});
}
last = u = i * m + m - 1;
for(int j = m; j--; --u) if(a[i][j] == '.') {
if(j + 1 < m && a[i][j+1] != '.') last = u;
else
g[u].push_back({last, d[u] + 1});
}
}
for(int j {}, u {}; j < m; ++j) {
int last = u = j;
for(int i {}; i < n; ++i, u += m) if(a[i][j] == '.') {
if(i && a[i-1][j] != '.') last = u;
else
g[u].push_back({last, d[u] + 1});
}
last = u = (n - 1) * m + j;
for(int i = n; i--; u -= m) if(a[i][j] == '.') {
if(i + 1 < n && a[i+1][j] != '.') last = u;
else
g[u].push_back({last, d[u] + 1});
}
}
fill(d, d + n*m, INF);
priority_queue<pair<int, int>> pq;
pq.emplace(d[o[0]] = 0, o[0]);
while(!empty(pq)) {
auto [dist, u] = pq.top(); pq.pop();
if((dist *= -1) != d[u]) continue;
for(auto [v, w] : g[u]) if(d[v] > dist + w)
pq.emplace(-(d[v] = dist + w), v);
}
cout << d[o[1]];
}
Compilation message
portals.cpp: In function 'int main()':
portals.cpp:91:16: warning: 'o[1]' may be used uninitialized in this function [-Wmaybe-uninitialized]
91 | cout << d[o[1]];
| ^
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
224 KB |
Output is correct |
| 7 |
Correct |
0 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
320 KB |
Output is correct |
| 9 |
Correct |
0 ms |
324 KB |
Output is correct |
| 10 |
Correct |
1 ms |
212 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
324 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
0 ms |
212 KB |
Output is correct |
| 7 |
Correct |
0 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
212 KB |
Output is correct |
| 9 |
Correct |
1 ms |
596 KB |
Output is correct |
| 10 |
Correct |
1 ms |
596 KB |
Output is correct |
| 11 |
Correct |
1 ms |
468 KB |
Output is correct |
| 12 |
Correct |
1 ms |
468 KB |
Output is correct |
| 13 |
Correct |
1 ms |
448 KB |
Output is correct |
| 14 |
Correct |
0 ms |
316 KB |
Output is correct |
| 15 |
Correct |
1 ms |
468 KB |
Output is correct |
| 16 |
Correct |
1 ms |
320 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
9 ms |
2772 KB |
Output is correct |
| 6 |
Correct |
11 ms |
2948 KB |
Output is correct |
| 7 |
Correct |
13 ms |
3460 KB |
Output is correct |
| 8 |
Correct |
7 ms |
2880 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
316 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
0 ms |
212 KB |
Output is correct |
| 7 |
Correct |
0 ms |
328 KB |
Output is correct |
| 8 |
Correct |
0 ms |
324 KB |
Output is correct |
| 9 |
Correct |
1 ms |
596 KB |
Output is correct |
| 10 |
Correct |
1 ms |
596 KB |
Output is correct |
| 11 |
Correct |
1 ms |
468 KB |
Output is correct |
| 12 |
Correct |
1 ms |
468 KB |
Output is correct |
| 13 |
Correct |
2 ms |
468 KB |
Output is correct |
| 14 |
Correct |
9 ms |
2804 KB |
Output is correct |
| 15 |
Correct |
10 ms |
2920 KB |
Output is correct |
| 16 |
Correct |
12 ms |
3284 KB |
Output is correct |
| 17 |
Correct |
12 ms |
3412 KB |
Output is correct |
| 18 |
Correct |
15 ms |
4024 KB |
Output is correct |
| 19 |
Correct |
19 ms |
4580 KB |
Output is correct |
| 20 |
Correct |
15 ms |
4692 KB |
Output is correct |
| 21 |
Correct |
9 ms |
2836 KB |
Output is correct |
| 22 |
Correct |
9 ms |
2812 KB |
Output is correct |
| 23 |
Correct |
10 ms |
3028 KB |
Output is correct |
| 24 |
Correct |
15 ms |
4564 KB |
Output is correct |
| 25 |
Correct |
1 ms |
212 KB |
Output is correct |
| 26 |
Correct |
1 ms |
456 KB |
Output is correct |
| 27 |
Correct |
1 ms |
212 KB |
Output is correct |
| 28 |
Correct |
7 ms |
2796 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
328 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
320 KB |
Output is correct |
| 9 |
Correct |
1 ms |
580 KB |
Output is correct |
| 10 |
Correct |
2 ms |
596 KB |
Output is correct |
| 11 |
Correct |
1 ms |
468 KB |
Output is correct |
| 12 |
Correct |
1 ms |
468 KB |
Output is correct |
| 13 |
Correct |
1 ms |
468 KB |
Output is correct |
| 14 |
Correct |
9 ms |
2804 KB |
Output is correct |
| 15 |
Correct |
10 ms |
2900 KB |
Output is correct |
| 16 |
Correct |
11 ms |
3288 KB |
Output is correct |
| 17 |
Correct |
11 ms |
3412 KB |
Output is correct |
| 18 |
Correct |
16 ms |
4068 KB |
Output is correct |
| 19 |
Correct |
17 ms |
4580 KB |
Output is correct |
| 20 |
Correct |
16 ms |
4692 KB |
Output is correct |
| 21 |
Correct |
10 ms |
2900 KB |
Output is correct |
| 22 |
Correct |
10 ms |
2772 KB |
Output is correct |
| 23 |
Correct |
10 ms |
3088 KB |
Output is correct |
| 24 |
Correct |
446 ms |
83820 KB |
Output is correct |
| 25 |
Correct |
669 ms |
108424 KB |
Output is correct |
| 26 |
Correct |
602 ms |
108412 KB |
Output is correct |
| 27 |
Correct |
600 ms |
108144 KB |
Output is correct |
| 28 |
Correct |
319 ms |
61700 KB |
Output is correct |
| 29 |
Correct |
341 ms |
62556 KB |
Output is correct |
| 30 |
Correct |
383 ms |
64756 KB |
Output is correct |
| 31 |
Correct |
15 ms |
4564 KB |
Output is correct |
| 32 |
Correct |
579 ms |
108100 KB |
Output is correct |
| 33 |
Correct |
0 ms |
212 KB |
Output is correct |
| 34 |
Correct |
1 ms |
468 KB |
Output is correct |
| 35 |
Correct |
405 ms |
80820 KB |
Output is correct |
| 36 |
Correct |
1 ms |
212 KB |
Output is correct |
| 37 |
Correct |
7 ms |
2808 KB |
Output is correct |
| 38 |
Correct |
273 ms |
61464 KB |
Output is correct |
| 39 |
Correct |
214 ms |
53452 KB |
Output is correct |
