#include <bits/stdc++.h>
using namespace std;
inline int in() {
int result = 0;
char ch = getchar_unlocked();
while(true) {
if(ch >= '0' && ch <= '9')
break;
ch = getchar_unlocked();
}
result = ch-'0';
while(true) {
ch = getchar_unlocked();
if (ch < '0' || ch > '9')
break;
result = result*10 + (ch - '0');
}
return result;
}
inline void out(int x) {
if(!x) {
putchar_unlocked('0');
return;
}
if(x<0) {
putchar_unlocked('-');
x=-x;
}
int rev=x, c=0;
while(!(rev%10)) {
++c;
rev/=10;
}
rev=0;
while(x) {
rev=rev*10+x%10;
x/=10;
}
while(rev) {
putchar_unlocked(rev%10+'0');
rev/=10;
}
while(c--)
putchar_unlocked('0');
}
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(cdp(v), dp[u]);
}
return dp[u];
}
int main() {
n=in(), m=in(), s=in()-1, d=in()-1, a=in()-1, b=in()-1;
while(m--) {
int u=in()-1, v=in()-1;
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])
out(max(min(da[d]-da[s], db[d]-db[s]), -1));
else
out(max(da[d]-da[s]-(cdp(d)<cdp(s)), -1));
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 2 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 3 |
Correct |
8 ms |
5144 KB |
Output is correct |
| 4 |
Correct |
7 ms |
5192 KB |
Output is correct |
| 5 |
Correct |
8 ms |
5252 KB |
Output is correct |
| 6 |
Correct |
7 ms |
5300 KB |
Output is correct |
| 7 |
Correct |
7 ms |
5300 KB |
Output is correct |
| 8 |
Correct |
6 ms |
5300 KB |
Output is correct |
| 9 |
Correct |
6 ms |
5308 KB |
Output is correct |
| 10 |
Correct |
9 ms |
5308 KB |
Output is correct |
| 11 |
Correct |
8 ms |
5308 KB |
Output is correct |
| 12 |
Correct |
7 ms |
5308 KB |
Output is correct |
| 13 |
Correct |
7 ms |
5308 KB |
Output is correct |
| 14 |
Correct |
9 ms |
5308 KB |
Output is correct |
| 15 |
Correct |
7 ms |
5308 KB |
Output is correct |
| 16 |
Correct |
8 ms |
5372 KB |
Output is correct |
| 17 |
Correct |
8 ms |
5372 KB |
Output is correct |
| 18 |
Correct |
9 ms |
5372 KB |
Output is correct |
| 19 |
Correct |
7 ms |
5392 KB |
Output is correct |
| 20 |
Correct |
7 ms |
5392 KB |
Output is correct |
| 21 |
Correct |
7 ms |
5392 KB |
Output is correct |
| 22 |
Correct |
6 ms |
5392 KB |
Output is correct |
| 23 |
Correct |
7 ms |
5392 KB |
Output is correct |
| 24 |
Correct |
7 ms |
5392 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
20 ms |
7144 KB |
Output is correct |
| 2 |
Correct |
54 ms |
8168 KB |
Output is correct |
| 3 |
Correct |
36 ms |
8168 KB |
Output is correct |
| 4 |
Correct |
47 ms |
8300 KB |
Output is correct |
| 5 |
Correct |
25 ms |
8300 KB |
Output is correct |
| 6 |
Correct |
29 ms |
8300 KB |
Output is correct |
| 7 |
Correct |
27 ms |
8300 KB |
Output is correct |
| 8 |
Correct |
31 ms |
8300 KB |
Output is correct |
| 9 |
Correct |
37 ms |
8300 KB |
Output is correct |
| 10 |
Correct |
121 ms |
12380 KB |
Output is correct |
| 11 |
Correct |
53 ms |
12380 KB |
Output is correct |
| 12 |
Correct |
86 ms |
12380 KB |
Output is correct |
| 13 |
Correct |
74 ms |
12380 KB |
Output is correct |
| 14 |
Correct |
53 ms |
12380 KB |
Output is correct |
| 15 |
Correct |
67 ms |
12380 KB |
Output is correct |
| 16 |
Correct |
65 ms |
12380 KB |
Output is correct |
| 17 |
Correct |
65 ms |
12380 KB |
Output is correct |
| 18 |
Correct |
58 ms |
12380 KB |
Output is correct |
| 19 |
Correct |
103 ms |
12380 KB |
Output is correct |
| 20 |
Correct |
174 ms |
14716 KB |
Output is correct |
| 21 |
Correct |
122 ms |
14716 KB |
Output is correct |
| 22 |
Correct |
91 ms |
14716 KB |
Output is correct |
| 23 |
Correct |
92 ms |
14716 KB |
Output is correct |
| 24 |
Correct |
143 ms |
14716 KB |
Output is correct |
| 25 |
Correct |
125 ms |
14716 KB |
Output is correct |
| 26 |
Correct |
82 ms |
14716 KB |
Output is correct |
| 27 |
Correct |
112 ms |
14716 KB |
Output is correct |
| 28 |
Correct |
182 ms |
14716 KB |
Output is correct |
| 29 |
Correct |
184 ms |
14716 KB |
Output is correct |
| 30 |
Correct |
180 ms |
15272 KB |
Output is correct |
| 31 |
Correct |
113 ms |
15272 KB |
Output is correct |
| 32 |
Correct |
161 ms |
15272 KB |
Output is correct |
| 33 |
Correct |
101 ms |
15272 KB |
Output is correct |
| 34 |
Correct |
131 ms |
15272 KB |
Output is correct |
| 35 |
Correct |
117 ms |
15272 KB |
Output is correct |
| 36 |
Correct |
129 ms |
15272 KB |
Output is correct |
| 37 |
Correct |
178 ms |
15272 KB |
Output is correct |
| 38 |
Correct |
147 ms |
15272 KB |
Output is correct |
| 39 |
Correct |
163 ms |
15272 KB |
Output is correct |
| 40 |
Correct |
216 ms |
15908 KB |
Output is correct |
| 41 |
Correct |
252 ms |
17992 KB |
Output is correct |
