#include <bits/stdc++.h>
using namespace std;
const int mxN=2e5;
int n, m, s, d, a, b, da[mxN], db[mxN], qu[mxN], qh, qt, dp[mxN];
vector<int> adj[mxN];
inline void bfs(int s, int dist[mxN]) {
qh=qt=0;
memset(dist, 0x3F, 4*n);
qu[qt++]=s;
dist[s]=0;
while(qh<qt) {
int u=qu[qh++];
for(int v : adj[u]) {
if(dist[v]>n) {
qu[qt++]=v;
dist[v]=dist[u]+1;
}
}
}
}
int cdp(int u) {
if(!dp[u]) {
dp[u]=da[u];
for(int v : adj[u])
if(da[v]==da[u]-1&&da[v]==db[v])
dp[u]=min(dp[v], dp[u]);
}
return dp[u];
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> n >> m >> s >> d >> a >> b, --s, --d, --a, --b;
while(m--) {
int u, v;
cin >> u >> v, --u, --v;
adj[u].push_back(v);
adj[v].push_back(u);
}
bfs(a, da);
bfs(b, db);
if(da[s]!=db[s]||da[d]!=db[d])
cout << max(min(da[d]-da[s], db[d]-db[s]), -1);
else
cout << max(da[d]-da[s]-(cdp(d)<cdp(s)), -1);
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
4984 KB |
Output is correct |
| 2 |
Correct |
7 ms |
5096 KB |
Output is correct |
| 3 |
Correct |
7 ms |
5096 KB |
Output is correct |
| 4 |
Incorrect |
8 ms |
5140 KB |
Output isn't correct |
| 5 |
Incorrect |
7 ms |
5220 KB |
Output isn't correct |
| 6 |
Partially correct |
7 ms |
5228 KB |
Partially correct |
| 7 |
Correct |
7 ms |
5232 KB |
Output is correct |
| 8 |
Incorrect |
7 ms |
5232 KB |
Output isn't correct |
| 9 |
Correct |
8 ms |
5300 KB |
Output is correct |
| 10 |
Correct |
9 ms |
5316 KB |
Output is correct |
| 11 |
Correct |
8 ms |
5316 KB |
Output is correct |
| 12 |
Incorrect |
7 ms |
5372 KB |
Output isn't correct |
| 13 |
Correct |
9 ms |
5376 KB |
Output is correct |
| 14 |
Correct |
7 ms |
5384 KB |
Output is correct |
| 15 |
Correct |
9 ms |
5516 KB |
Output is correct |
| 16 |
Incorrect |
7 ms |
5516 KB |
Output isn't correct |
| 17 |
Incorrect |
8 ms |
5516 KB |
Output isn't correct |
| 18 |
Incorrect |
10 ms |
5516 KB |
Output isn't correct |
| 19 |
Correct |
8 ms |
5532 KB |
Output is correct |
| 20 |
Correct |
6 ms |
5556 KB |
Output is correct |
| 21 |
Correct |
8 ms |
5704 KB |
Output is correct |
| 22 |
Partially correct |
9 ms |
5704 KB |
Partially correct |
| 23 |
Partially correct |
9 ms |
5704 KB |
Partially correct |
| 24 |
Incorrect |
9 ms |
5704 KB |
Output isn't correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
40 ms |
7712 KB |
Output is correct |
| 2 |
Incorrect |
49 ms |
9216 KB |
Output isn't correct |
| 3 |
Correct |
37 ms |
9216 KB |
Output is correct |
| 4 |
Incorrect |
58 ms |
10540 KB |
Output isn't correct |
| 5 |
Correct |
46 ms |
10540 KB |
Output is correct |
| 6 |
Correct |
44 ms |
10856 KB |
Output is correct |
| 7 |
Partially correct |
51 ms |
11492 KB |
Partially correct |
| 8 |
Correct |
38 ms |
12052 KB |
Output is correct |
| 9 |
Incorrect |
66 ms |
13520 KB |
Output isn't correct |
| 10 |
Correct |
257 ms |
23152 KB |
Output is correct |
| 11 |
Incorrect |
66 ms |
23152 KB |
Output isn't correct |
| 12 |
Correct |
96 ms |
23804 KB |
Output is correct |
| 13 |
Incorrect |
90 ms |
24212 KB |
Output isn't correct |
| 14 |
Correct |
71 ms |
24512 KB |
Output is correct |
| 15 |
Correct |
110 ms |
27268 KB |
Output is correct |
| 16 |
Correct |
92 ms |
29044 KB |
Output is correct |
| 17 |
Correct |
92 ms |
29800 KB |
Output is correct |
| 18 |
Correct |
133 ms |
31040 KB |
Output is correct |
| 19 |
Correct |
219 ms |
34976 KB |
Output is correct |
| 20 |
Incorrect |
325 ms |
43208 KB |
Output isn't correct |
| 21 |
Incorrect |
133 ms |
43348 KB |
Output isn't correct |
| 22 |
Correct |
151 ms |
44228 KB |
Output is correct |
| 23 |
Correct |
142 ms |
47016 KB |
Output is correct |
| 24 |
Correct |
133 ms |
48840 KB |
Output is correct |
| 25 |
Incorrect |
143 ms |
50300 KB |
Output isn't correct |
| 26 |
Correct |
155 ms |
51772 KB |
Output is correct |
| 27 |
Correct |
180 ms |
54616 KB |
Output is correct |
| 28 |
Correct |
167 ms |
56516 KB |
Output is correct |
| 29 |
Correct |
253 ms |
60400 KB |
Output is correct |
| 30 |
Incorrect |
361 ms |
68240 KB |
Output isn't correct |
| 31 |
Incorrect |
181 ms |
68984 KB |
Output isn't correct |
| 32 |
Correct |
192 ms |
70020 KB |
Output is correct |
| 33 |
Correct |
169 ms |
72176 KB |
Output is correct |
| 34 |
Incorrect |
225 ms |
74900 KB |
Output isn't correct |
| 35 |
Incorrect |
160 ms |
76600 KB |
Output isn't correct |
| 36 |
Incorrect |
171 ms |
78964 KB |
Output isn't correct |
| 37 |
Correct |
232 ms |
81252 KB |
Output is correct |
| 38 |
Correct |
204 ms |
81252 KB |
Output is correct |
| 39 |
Correct |
253 ms |
81252 KB |
Output is correct |
| 40 |
Incorrect |
327 ms |
82580 KB |
Output isn't correct |
| 41 |
Correct |
414 ms |
84608 KB |
Output is correct |
