| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 37201 |
2017-12-22T14:04:23 Z |
aome |
007 (CEOI14_007) |
C++14 |
|
366 ms |
19956 KB |
#include <bits/stdc++.h>
using namespace std;
const int N = 200005;
const int INF = 1e9;
int n, m;
int p0, p1, a[2];
int dis[2][N];
int f[N], dis2[N];
bool lose[N];
vector<int> G[N];
void bfs(int t) {
for (int i = 1; i <= n; ++i) dis[t][i] = INF;
queue<int> qu; dis[t][a[t]] = 0, qu.push(a[t]);
while (qu.size()) {
int u = qu.front(); qu.pop();
for (auto v : G[u]) {
if (dis[t][v] == INF) {
dis[t][v] = dis[t][u] + 1, qu.push(v);
}
}
}
}
void dfs(int u) {
f[u] = 1;
for (auto v : G[u]) {
if (dis[0][v] + 1 != dis[0][u] || dis[1][v] + 1 != dis[1][u]) continue;
if (!f[v]) dfs(v); f[u] = max(f[u], f[v] + 1);
}
}
int main() {
ios::sync_with_stdio(false);
cin >> n >> m;
cin >> p0 >> p1 >> a[0] >> a[1];
for (int i = 1; i <= m; ++i) {
int u, v; cin >> u >> v;
G[u].push_back(v), G[v].push_back(u);
}
bfs(0), bfs(1);
for (int i = 1; i <= n; ++i) {
if (dis[0][i] < dis[0][p0] || dis[1][i] < dis[1][p0]) lose[i] = 1;
}
if (dis[0][p0] == dis[1][p0]) {
for (int i = 1; i <= n; ++i) {
if (dis[0][i] == dis[0][p0] && dis[1][i] == dis[1][p0] && !f[i]) dfs(i);
}
for (int i = 1; i <= n; ++i) {
if (f[i] > f[p0]) lose[i] = 1;
}
}
for (int i = 1; i <= n; ++i) dis2[i] = -1;
queue<int> qu; dis2[p1] = 0, qu.push(p1);
while (qu.size()) {
int u = qu.front(); qu.pop();
if (lose[u]) {
cout << dis2[u] - 1; return 0;
}
for (auto v : G[u]) {
if (dis2[v] == -1) {
dis2[v] = dis2[u] + 1, qu.push(v);
}
}
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 2 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 3 |
Correct |
3 ms |
10188 KB |
Output is correct |
| 4 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 5 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 6 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 7 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 8 |
Correct |
3 ms |
10188 KB |
Output is correct |
| 9 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 10 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 11 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 12 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 13 |
Correct |
3 ms |
10188 KB |
Output is correct |
| 14 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 15 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 16 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 17 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 18 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 19 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 20 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 21 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 22 |
Correct |
3 ms |
10188 KB |
Output is correct |
| 23 |
Correct |
0 ms |
10188 KB |
Output is correct |
| 24 |
Correct |
0 ms |
10188 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
26 ms |
11376 KB |
Output is correct |
| 2 |
Correct |
46 ms |
12044 KB |
Output is correct |
| 3 |
Correct |
23 ms |
11508 KB |
Output is correct |
| 4 |
Correct |
43 ms |
12036 KB |
Output is correct |
| 5 |
Correct |
16 ms |
11376 KB |
Output is correct |
| 6 |
Correct |
23 ms |
11508 KB |
Output is correct |
| 7 |
Correct |
26 ms |
11640 KB |
Output is correct |
| 8 |
Correct |
26 ms |
11640 KB |
Output is correct |
| 9 |
Correct |
49 ms |
12168 KB |
Output is correct |
| 10 |
Correct |
179 ms |
16392 KB |
Output is correct |
| 11 |
Correct |
69 ms |
12960 KB |
Output is correct |
| 12 |
Correct |
89 ms |
13752 KB |
Output is correct |
| 13 |
Correct |
79 ms |
13224 KB |
Output is correct |
| 14 |
Correct |
73 ms |
12696 KB |
Output is correct |
| 15 |
Correct |
79 ms |
13752 KB |
Output is correct |
| 16 |
Correct |
83 ms |
14016 KB |
Output is correct |
| 17 |
Correct |
79 ms |
13620 KB |
Output is correct |
| 18 |
Correct |
69 ms |
13620 KB |
Output is correct |
| 19 |
Correct |
143 ms |
14808 KB |
Output is correct |
| 20 |
Correct |
276 ms |
17580 KB |
Output is correct |
| 21 |
Correct |
123 ms |
15408 KB |
Output is correct |
| 22 |
Correct |
116 ms |
14544 KB |
Output is correct |
| 23 |
Correct |
143 ms |
15072 KB |
Output is correct |
| 24 |
Correct |
153 ms |
15224 KB |
Output is correct |
| 25 |
Correct |
136 ms |
14808 KB |
Output is correct |
| 26 |
Correct |
113 ms |
14544 KB |
Output is correct |
| 27 |
Correct |
136 ms |
15204 KB |
Output is correct |
| 28 |
Correct |
139 ms |
15204 KB |
Output is correct |
| 29 |
Correct |
196 ms |
15996 KB |
Output is correct |
| 30 |
Correct |
246 ms |
18108 KB |
Output is correct |
| 31 |
Correct |
123 ms |
16228 KB |
Output is correct |
| 32 |
Correct |
119 ms |
15072 KB |
Output is correct |
| 33 |
Correct |
139 ms |
15336 KB |
Output is correct |
| 34 |
Correct |
139 ms |
15468 KB |
Output is correct |
| 35 |
Correct |
136 ms |
15520 KB |
Output is correct |
| 36 |
Correct |
119 ms |
15904 KB |
Output is correct |
| 37 |
Correct |
143 ms |
16260 KB |
Output is correct |
| 38 |
Correct |
169 ms |
16128 KB |
Output is correct |
| 39 |
Correct |
169 ms |
16128 KB |
Output is correct |
| 40 |
Correct |
236 ms |
17844 KB |
Output is correct |
| 41 |
Correct |
366 ms |
19956 KB |
Output is correct |
