#include<bits/stdc++.h>
using namespace std;
const int N = 2e5 + 1;
vector<int> g[N];
int fa[N];
int fb[N];
int n;
int bfs(int s,int d[]) {
fill(d + 1,d + 1 + n,-1);
d[s] = 0;
queue<int> q;
q.push(s);
while(q.size()) {
int u = q.front(); q.pop();
for(int v : g[u])
if (d[v] < 0) {
d[v] = d[u] + 1;
q.push(v);
}
}
return 1;
}
int go(int s) {
vector<int> d(n + 1,-1);
d[s] = -1;
queue<int> q;
q.push(s);
int ans = 0;
while(q.size()) {
int u = q.front(); q.pop();
for(int v : g[u])
if (fa[v] + 1 == fa[u] && fb[v] + 1 == fb[u] && d[v] < 0) {
d[v] = d[u] + 1;
ans = max(ans,d[v]);
q.push(v);
}
}
return ans;
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int m, s, d, a, b;
cin >> n >> m >> s >> d >> a >> b;
while (m--) {
int x, y; cin >> x >> y;
g[x].push_back(y);
g[y].push_back(x);
}
bfs(a,fa);
bfs(b,fb);
int dA = fa[d] - fa[s];
int dB = fb[d] - fb[s];
if (dA != dB) cout << max(min(dA,dB),-1);
if (dA == dB) cout << max(dA - (dA + go(s) < go(d)),-1);
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
5112 KB |
Output is correct |
| 2 |
Correct |
5 ms |
5232 KB |
Output is correct |
| 3 |
Correct |
5 ms |
5232 KB |
Output is correct |
| 4 |
Correct |
5 ms |
5232 KB |
Output is correct |
| 5 |
Correct |
5 ms |
5232 KB |
Output is correct |
| 6 |
Correct |
5 ms |
5240 KB |
Output is correct |
| 7 |
Correct |
5 ms |
5240 KB |
Output is correct |
| 8 |
Correct |
6 ms |
5368 KB |
Output is correct |
| 9 |
Correct |
5 ms |
5368 KB |
Output is correct |
| 10 |
Correct |
5 ms |
5368 KB |
Output is correct |
| 11 |
Correct |
5 ms |
5368 KB |
Output is correct |
| 12 |
Correct |
6 ms |
5440 KB |
Output is correct |
| 13 |
Correct |
5 ms |
5440 KB |
Output is correct |
| 14 |
Correct |
5 ms |
5440 KB |
Output is correct |
| 15 |
Correct |
5 ms |
5440 KB |
Output is correct |
| 16 |
Correct |
6 ms |
5440 KB |
Output is correct |
| 17 |
Correct |
6 ms |
5440 KB |
Output is correct |
| 18 |
Correct |
6 ms |
5440 KB |
Output is correct |
| 19 |
Correct |
6 ms |
5440 KB |
Output is correct |
| 20 |
Correct |
6 ms |
5440 KB |
Output is correct |
| 21 |
Correct |
6 ms |
5440 KB |
Output is correct |
| 22 |
Correct |
6 ms |
5440 KB |
Output is correct |
| 23 |
Correct |
6 ms |
5440 KB |
Output is correct |
| 24 |
Correct |
6 ms |
5508 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
23 ms |
7116 KB |
Output is correct |
| 2 |
Correct |
33 ms |
7896 KB |
Output is correct |
| 3 |
Correct |
25 ms |
7896 KB |
Output is correct |
| 4 |
Correct |
35 ms |
8028 KB |
Output is correct |
| 5 |
Correct |
26 ms |
8028 KB |
Output is correct |
| 6 |
Correct |
26 ms |
8028 KB |
Output is correct |
| 7 |
Correct |
29 ms |
8028 KB |
Output is correct |
| 8 |
Correct |
30 ms |
8028 KB |
Output is correct |
| 9 |
Correct |
39 ms |
8028 KB |
Output is correct |
| 10 |
Correct |
150 ms |
12280 KB |
Output is correct |
| 11 |
Correct |
52 ms |
12280 KB |
Output is correct |
| 12 |
Correct |
59 ms |
12280 KB |
Output is correct |
| 13 |
Correct |
49 ms |
12280 KB |
Output is correct |
| 14 |
Correct |
37 ms |
12280 KB |
Output is correct |
| 15 |
Correct |
57 ms |
12280 KB |
Output is correct |
| 16 |
Correct |
63 ms |
12280 KB |
Output is correct |
| 17 |
Correct |
53 ms |
12280 KB |
Output is correct |
| 18 |
Correct |
56 ms |
12280 KB |
Output is correct |
| 19 |
Correct |
104 ms |
12280 KB |
Output is correct |
| 20 |
Correct |
181 ms |
14224 KB |
Output is correct |
| 21 |
Correct |
102 ms |
14224 KB |
Output is correct |
| 22 |
Correct |
86 ms |
14224 KB |
Output is correct |
| 23 |
Correct |
104 ms |
14224 KB |
Output is correct |
| 24 |
Correct |
114 ms |
14224 KB |
Output is correct |
| 25 |
Correct |
103 ms |
14224 KB |
Output is correct |
| 26 |
Correct |
107 ms |
14224 KB |
Output is correct |
| 27 |
Correct |
114 ms |
14224 KB |
Output is correct |
| 28 |
Correct |
123 ms |
14224 KB |
Output is correct |
| 29 |
Correct |
171 ms |
14224 KB |
Output is correct |
| 30 |
Correct |
254 ms |
14812 KB |
Output is correct |
| 31 |
Correct |
129 ms |
14812 KB |
Output is correct |
| 32 |
Correct |
137 ms |
14812 KB |
Output is correct |
| 33 |
Correct |
125 ms |
14812 KB |
Output is correct |
| 34 |
Correct |
139 ms |
14812 KB |
Output is correct |
| 35 |
Correct |
110 ms |
14812 KB |
Output is correct |
| 36 |
Correct |
94 ms |
14812 KB |
Output is correct |
| 37 |
Correct |
111 ms |
14812 KB |
Output is correct |
| 38 |
Correct |
105 ms |
14812 KB |
Output is correct |
| 39 |
Correct |
141 ms |
14812 KB |
Output is correct |
| 40 |
Correct |
202 ms |
15200 KB |
Output is correct |
| 41 |
Correct |
307 ms |
17372 KB |
Output is correct |
