#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
typedef pair<int, int> ii;
const int N = 2e5 + 5, inf = 1e9 + 123;
int n, m, src[2], a[2], d[2][N], l = -1, r = 6e5 + 5;
vector<int> gr[N];
void dijkstra (bool _) {
for (int i = 1; i <= n; ++i) d[_][i] = inf;
d[_][ src[_] ] = 0;
priority_queue<ii, vector<ii>, greater<ii> > pq; pq.push(ii(d[_][ src[_] ], src[_]) );
while (!pq.empty() ) {
ii tmp = pq.top(); pq.pop();
int u = tmp.se;
if (tmp.fi > d[_][u]) continue ;
for (int v : gr[u]) {
if (d[_][v] > d[_][u] + 1) {
d[_][v] = d[_][u] + 1;
pq.push(ii(d[_][v], v) );
}
}
}
}
bool check (int Time) {
d[1][ a[0] ] -= Time;
d[1][ a[1] ] -= Time;
if (d[0][ a[0] ] > d[1][ a[0] ] || d[0][ a[1] ] > d[1][ a[1] ]) {
d[1][ a[0] ] += Time;
d[1][ a[1] ] += Time;
return false;
}
d[1][ a[0] ] += Time;
d[1][ a[1] ] += Time;
return true;
}
int main () {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
//freopen("SPY.INP", "r", stdin);
//freopen("SPY.OUT", "w", stdout);
cin >> n >> m;
cin >> src[0] >> src[1] >> a[0] >> a[1];
while (m --) {
int u, v; cin >> u >> v;
gr[u].pb(v); gr[v].pb(u);
}
dijkstra(0);
dijkstra(1);
while (l < r) {
int mid = (l + r + 1) / 2;
if (check(mid) ) l = mid;
else r = mid - 1;
}
cout << l;
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
5084 KB |
Output is correct |
| 2 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 3 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 4 |
Incorrect |
6 ms |
5152 KB |
Output isn't correct |
| 5 |
Incorrect |
5 ms |
5152 KB |
Output isn't correct |
| 6 |
Correct |
6 ms |
5200 KB |
Output is correct |
| 7 |
Correct |
7 ms |
5200 KB |
Output is correct |
| 8 |
Incorrect |
7 ms |
5200 KB |
Output isn't correct |
| 9 |
Correct |
6 ms |
5200 KB |
Output is correct |
| 10 |
Correct |
6 ms |
5200 KB |
Output is correct |
| 11 |
Correct |
6 ms |
5300 KB |
Output is correct |
| 12 |
Incorrect |
6 ms |
5300 KB |
Output isn't correct |
| 13 |
Correct |
6 ms |
5328 KB |
Output is correct |
| 14 |
Incorrect |
6 ms |
5328 KB |
Output isn't correct |
| 15 |
Correct |
6 ms |
5328 KB |
Output is correct |
| 16 |
Incorrect |
6 ms |
5328 KB |
Output isn't correct |
| 17 |
Incorrect |
6 ms |
5344 KB |
Output isn't correct |
| 18 |
Incorrect |
6 ms |
5348 KB |
Output isn't correct |
| 19 |
Correct |
6 ms |
5348 KB |
Output is correct |
| 20 |
Correct |
7 ms |
5348 KB |
Output is correct |
| 21 |
Correct |
6 ms |
5348 KB |
Output is correct |
| 22 |
Correct |
7 ms |
5348 KB |
Output is correct |
| 23 |
Correct |
6 ms |
5348 KB |
Output is correct |
| 24 |
Incorrect |
7 ms |
5348 KB |
Output isn't correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
38 ms |
6880 KB |
Output is correct |
| 2 |
Incorrect |
50 ms |
7528 KB |
Output isn't correct |
| 3 |
Correct |
40 ms |
7528 KB |
Output is correct |
| 4 |
Incorrect |
47 ms |
7716 KB |
Output isn't correct |
| 5 |
Correct |
39 ms |
7716 KB |
Output is correct |
| 6 |
Correct |
37 ms |
7716 KB |
Output is correct |
| 7 |
Correct |
49 ms |
7716 KB |
Output is correct |
| 8 |
Correct |
46 ms |
7716 KB |
Output is correct |
| 9 |
Incorrect |
58 ms |
7716 KB |
Output isn't correct |
| 10 |
Correct |
183 ms |
12032 KB |
Output is correct |
| 11 |
Incorrect |
87 ms |
12032 KB |
Output isn't correct |
| 12 |
Correct |
129 ms |
12032 KB |
Output is correct |
| 13 |
Incorrect |
104 ms |
12032 KB |
Output isn't correct |
| 14 |
Correct |
82 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
136 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
122 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
109 ms |
12032 KB |
Output is correct |
| 18 |
Incorrect |
123 ms |
12032 KB |
Output isn't correct |
| 19 |
Correct |
153 ms |
12032 KB |
Output is correct |
| 20 |
Incorrect |
260 ms |
13692 KB |
Output isn't correct |
| 21 |
Incorrect |
153 ms |
13692 KB |
Output isn't correct |
| 22 |
Correct |
147 ms |
13692 KB |
Output is correct |
| 23 |
Correct |
162 ms |
13692 KB |
Output is correct |
| 24 |
Correct |
148 ms |
13692 KB |
Output is correct |
| 25 |
Incorrect |
163 ms |
13692 KB |
Output isn't correct |
| 26 |
Correct |
140 ms |
13692 KB |
Output is correct |
| 27 |
Correct |
173 ms |
13692 KB |
Output is correct |
| 28 |
Correct |
186 ms |
13692 KB |
Output is correct |
| 29 |
Correct |
189 ms |
13692 KB |
Output is correct |
| 30 |
Incorrect |
269 ms |
14248 KB |
Output isn't correct |
| 31 |
Incorrect |
184 ms |
14248 KB |
Output isn't correct |
| 32 |
Correct |
181 ms |
14248 KB |
Output is correct |
| 33 |
Correct |
185 ms |
14248 KB |
Output is correct |
| 34 |
Incorrect |
269 ms |
14248 KB |
Output isn't correct |
| 35 |
Incorrect |
160 ms |
14248 KB |
Output isn't correct |
| 36 |
Incorrect |
167 ms |
14248 KB |
Output isn't correct |
| 37 |
Correct |
197 ms |
14248 KB |
Output is correct |
| 38 |
Correct |
214 ms |
14248 KB |
Output is correct |
| 39 |
Correct |
240 ms |
14248 KB |
Output is correct |
| 40 |
Incorrect |
286 ms |
14344 KB |
Output isn't correct |
| 41 |
Correct |
373 ms |
16524 KB |
Output is correct |
