| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 37163 |
2017-12-21T16:58:34 Z |
cheater2k |
007 (CEOI14_007) |
C++14 |
|
339 ms |
18956 KB |
#include <bits/stdc++.h>
using namespace std;
const int N = 200005;
int n, m, s, d, a, b;
vector<int> G[N];
int fa[N], fb[N];
void bfs(int start, int f[]) {
for (int i = 1; i <= n; ++i) f[i] = -1;
f[start] = 0;
queue <int> q; q.push(start);
while(!q.empty()) {
int u = q.front(); q.pop();
for (int v : G[u]) if (f[v] == -1) {
f[v] = f[u] + 1; q.push(v);
}
}
}
int maxdep(int start) {
vector<int> d(n + 1, -1);
queue <int> q; q.push(start); d[start] = 0;
int ans = 0;
while(!q.empty()) {
int u = q.front(); q.pop();
ans = max(ans, d[u]);
for (int v : G[u]) if (fa[v] == fa[u] - 1 && fb[v] == fb[u] - 1 && d[v] == -1) {
d[v] = d[u] + 1; q.push(v);
}
}
return ans;
}
int main() {
ios_base::sync_with_stdio(false); cin.tie(0);
cin >> n >> m;
cin >> s >> d >> a >> b;
while(m--) {
int u, v; cin >> u >> v;
G[u].push_back(v); G[v].push_back(u);
}
bfs(a, fa);
bfs(b, fb);
int wa = fa[d] - fa[s];
int wb = fb[d] - fb[s];
if (wa != wb) {
printf("%d\n", max(min(wa, wb), -1));
} else {
int maxs = maxdep(s), maxd = maxdep(d);
printf("%d\n", max(wa - (wa + maxs < maxd), -1));
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
8428 KB |
Output is correct |
| 2 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 3 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 4 |
Correct |
3 ms |
8428 KB |
Output is correct |
| 5 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 6 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 7 |
Correct |
3 ms |
8428 KB |
Output is correct |
| 8 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 9 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 10 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 11 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 12 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 13 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 14 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 15 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 16 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 17 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 18 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 19 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 20 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 21 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 22 |
Correct |
0 ms |
8428 KB |
Output is correct |
| 23 |
Correct |
3 ms |
8428 KB |
Output is correct |
| 24 |
Correct |
3 ms |
8428 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
16 ms |
9896 KB |
Output is correct |
| 2 |
Correct |
59 ms |
10544 KB |
Output is correct |
| 3 |
Correct |
23 ms |
9976 KB |
Output is correct |
| 4 |
Correct |
36 ms |
10620 KB |
Output is correct |
| 5 |
Correct |
19 ms |
9616 KB |
Output is correct |
| 6 |
Correct |
19 ms |
9748 KB |
Output is correct |
| 7 |
Correct |
19 ms |
10184 KB |
Output is correct |
| 8 |
Correct |
23 ms |
10184 KB |
Output is correct |
| 9 |
Correct |
39 ms |
10600 KB |
Output is correct |
| 10 |
Correct |
179 ms |
14872 KB |
Output is correct |
| 11 |
Correct |
46 ms |
11644 KB |
Output is correct |
| 12 |
Correct |
73 ms |
12440 KB |
Output is correct |
| 13 |
Correct |
59 ms |
11888 KB |
Output is correct |
| 14 |
Correct |
49 ms |
11352 KB |
Output is correct |
| 15 |
Correct |
66 ms |
12532 KB |
Output is correct |
| 16 |
Correct |
79 ms |
12256 KB |
Output is correct |
| 17 |
Correct |
59 ms |
12296 KB |
Output is correct |
| 18 |
Correct |
76 ms |
12296 KB |
Output is correct |
| 19 |
Correct |
119 ms |
13484 KB |
Output is correct |
| 20 |
Correct |
246 ms |
16268 KB |
Output is correct |
| 21 |
Correct |
116 ms |
14116 KB |
Output is correct |
| 22 |
Correct |
99 ms |
13340 KB |
Output is correct |
| 23 |
Correct |
96 ms |
14024 KB |
Output is correct |
| 24 |
Correct |
126 ms |
13976 KB |
Output is correct |
| 25 |
Correct |
103 ms |
13680 KB |
Output is correct |
| 26 |
Correct |
93 ms |
13412 KB |
Output is correct |
| 27 |
Correct |
93 ms |
14088 KB |
Output is correct |
| 28 |
Correct |
116 ms |
14096 KB |
Output is correct |
| 29 |
Correct |
133 ms |
14784 KB |
Output is correct |
| 30 |
Correct |
213 ms |
16856 KB |
Output is correct |
| 31 |
Correct |
136 ms |
14948 KB |
Output is correct |
| 32 |
Correct |
113 ms |
14024 KB |
Output is correct |
| 33 |
Correct |
103 ms |
14236 KB |
Output is correct |
| 34 |
Correct |
133 ms |
14496 KB |
Output is correct |
| 35 |
Correct |
106 ms |
14280 KB |
Output is correct |
| 36 |
Correct |
109 ms |
14508 KB |
Output is correct |
| 37 |
Correct |
143 ms |
14500 KB |
Output is correct |
| 38 |
Correct |
146 ms |
15144 KB |
Output is correct |
| 39 |
Correct |
176 ms |
15152 KB |
Output is correct |
| 40 |
Correct |
246 ms |
16792 KB |
Output is correct |
| 41 |
Correct |
339 ms |
18956 KB |
Output is correct |
