#include <bits/stdc++.h>
using namespace std;
#define db(...) " [" << #__VA_ARGS__ << " : " << (__VA_ARGS__) << "] "
#define N 200005
int n, m;
int a[N];
vector<int> g[N];
// nhan xet: bay len den 1 diem mid sau do di xuong
int up[N]; // bay len
int down[N]; // bay xuong
template<class A, class B>
bool mini(A &a, const B &b) {
return a > b ? (a = b), true : false;
}
void dijkstra(int src, int d[]) {
fill(d + 1, d + n + 1, 2e8);
d[src] = 0;
using T = pair<int, int>;
priority_queue<T, vector<T>, greater<T>> pq;
pq.emplace(0, src);
while (pq.size()) {
auto [c, u] = pq.top();
pq.pop();
if (c != d[u]) {
continue;
}
for (int v : g[u]) {
if (mini(d[v], max(d[u] + 1, a[v]))) {
pq.emplace(d[v], v);
}
}
}
}
signed main() {
ios::sync_with_stdio(false);
cin.tie(0);
cin >> n >> m;
for (int i = 1; i <= n; ++i) {
cin >> a[i];
}
for (int i = 1, u, v; i <= m; ++i) {
cin >> u >> v;
g[u].emplace_back(v);
g[v].emplace_back(u);
}
dijkstra(1, up);
dijkstra(n, down);
int res = 1e9;
for (int i = 1; i <= n; ++i) {
res = min(res, 2 * max(up[i], down[i]));
}
// giao nhau tai (u, v)
for (int u = 1; u <= n; ++u) {
for (int v : g[u]) {
res = min(res, 2 * max(up[u], down[v]) + 1);
}
}
cout << res;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
6492 KB |
Output is correct |
2 |
Correct |
57 ms |
13652 KB |
Output is correct |
3 |
Correct |
58 ms |
17232 KB |
Output is correct |
4 |
Correct |
61 ms |
17484 KB |
Output is correct |
5 |
Correct |
60 ms |
18000 KB |
Output is correct |
6 |
Correct |
62 ms |
17832 KB |
Output is correct |
7 |
Correct |
62 ms |
17916 KB |
Output is correct |
8 |
Correct |
1 ms |
6492 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
6492 KB |
Output is correct |
2 |
Correct |
1 ms |
6492 KB |
Output is correct |
3 |
Correct |
1 ms |
6488 KB |
Output is correct |
4 |
Correct |
1 ms |
6488 KB |
Output is correct |
5 |
Correct |
1 ms |
6492 KB |
Output is correct |
6 |
Correct |
2 ms |
6492 KB |
Output is correct |
7 |
Correct |
2 ms |
6636 KB |
Output is correct |
8 |
Correct |
2 ms |
6492 KB |
Output is correct |
9 |
Correct |
2 ms |
6632 KB |
Output is correct |
10 |
Correct |
2 ms |
6492 KB |
Output is correct |
11 |
Correct |
2 ms |
6492 KB |
Output is correct |
12 |
Correct |
2 ms |
6492 KB |
Output is correct |
13 |
Correct |
2 ms |
6632 KB |
Output is correct |
14 |
Correct |
2 ms |
6708 KB |
Output is correct |
15 |
Correct |
3 ms |
6744 KB |
Output is correct |
16 |
Correct |
3 ms |
6748 KB |
Output is correct |
17 |
Correct |
3 ms |
6748 KB |
Output is correct |
18 |
Correct |
1 ms |
6492 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
6492 KB |
Output is correct |
2 |
Correct |
1 ms |
6492 KB |
Output is correct |
3 |
Correct |
1 ms |
6488 KB |
Output is correct |
4 |
Correct |
1 ms |
6488 KB |
Output is correct |
5 |
Correct |
1 ms |
6492 KB |
Output is correct |
6 |
Correct |
2 ms |
6492 KB |
Output is correct |
7 |
Correct |
2 ms |
6636 KB |
Output is correct |
8 |
Correct |
2 ms |
6492 KB |
Output is correct |
9 |
Correct |
2 ms |
6632 KB |
Output is correct |
10 |
Correct |
2 ms |
6492 KB |
Output is correct |
11 |
Correct |
2 ms |
6492 KB |
Output is correct |
12 |
Correct |
2 ms |
6492 KB |
Output is correct |
13 |
Correct |
2 ms |
6632 KB |
Output is correct |
14 |
Correct |
2 ms |
6708 KB |
Output is correct |
15 |
Correct |
3 ms |
6744 KB |
Output is correct |
16 |
Correct |
3 ms |
6748 KB |
Output is correct |
17 |
Correct |
3 ms |
6748 KB |
Output is correct |
18 |
Correct |
1 ms |
6492 KB |
Output is correct |
19 |
Correct |
2 ms |
6656 KB |
Output is correct |
20 |
Correct |
2 ms |
6492 KB |
Output is correct |
21 |
Correct |
2 ms |
6716 KB |
Output is correct |
22 |
Correct |
2 ms |
6492 KB |
Output is correct |
23 |
Correct |
2 ms |
6488 KB |
Output is correct |
24 |
Correct |
2 ms |
6492 KB |
Output is correct |
25 |
Correct |
2 ms |
6492 KB |
Output is correct |
26 |
Correct |
2 ms |
6576 KB |
Output is correct |
27 |
Correct |
2 ms |
6748 KB |
Output is correct |
28 |
Correct |
3 ms |
6748 KB |
Output is correct |
29 |
Correct |
3 ms |
6748 KB |
Output is correct |
30 |
Correct |
3 ms |
6748 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
6492 KB |
Output is correct |
2 |
Correct |
57 ms |
13652 KB |
Output is correct |
3 |
Correct |
58 ms |
17232 KB |
Output is correct |
4 |
Correct |
61 ms |
17484 KB |
Output is correct |
5 |
Correct |
60 ms |
18000 KB |
Output is correct |
6 |
Correct |
62 ms |
17832 KB |
Output is correct |
7 |
Correct |
62 ms |
17916 KB |
Output is correct |
8 |
Correct |
1 ms |
6492 KB |
Output is correct |
9 |
Correct |
1 ms |
6492 KB |
Output is correct |
10 |
Correct |
1 ms |
6492 KB |
Output is correct |
11 |
Correct |
1 ms |
6488 KB |
Output is correct |
12 |
Correct |
1 ms |
6488 KB |
Output is correct |
13 |
Correct |
1 ms |
6492 KB |
Output is correct |
14 |
Correct |
2 ms |
6492 KB |
Output is correct |
15 |
Correct |
2 ms |
6636 KB |
Output is correct |
16 |
Correct |
2 ms |
6492 KB |
Output is correct |
17 |
Correct |
2 ms |
6632 KB |
Output is correct |
18 |
Correct |
2 ms |
6492 KB |
Output is correct |
19 |
Correct |
2 ms |
6492 KB |
Output is correct |
20 |
Correct |
2 ms |
6492 KB |
Output is correct |
21 |
Correct |
2 ms |
6632 KB |
Output is correct |
22 |
Correct |
2 ms |
6708 KB |
Output is correct |
23 |
Correct |
3 ms |
6744 KB |
Output is correct |
24 |
Correct |
3 ms |
6748 KB |
Output is correct |
25 |
Correct |
3 ms |
6748 KB |
Output is correct |
26 |
Correct |
1 ms |
6492 KB |
Output is correct |
27 |
Correct |
2 ms |
6656 KB |
Output is correct |
28 |
Correct |
2 ms |
6492 KB |
Output is correct |
29 |
Correct |
2 ms |
6716 KB |
Output is correct |
30 |
Correct |
2 ms |
6492 KB |
Output is correct |
31 |
Correct |
2 ms |
6488 KB |
Output is correct |
32 |
Correct |
2 ms |
6492 KB |
Output is correct |
33 |
Correct |
2 ms |
6492 KB |
Output is correct |
34 |
Correct |
2 ms |
6576 KB |
Output is correct |
35 |
Correct |
2 ms |
6748 KB |
Output is correct |
36 |
Correct |
3 ms |
6748 KB |
Output is correct |
37 |
Correct |
3 ms |
6748 KB |
Output is correct |
38 |
Correct |
3 ms |
6748 KB |
Output is correct |
39 |
Correct |
133 ms |
18004 KB |
Output is correct |
40 |
Correct |
112 ms |
17264 KB |
Output is correct |
41 |
Correct |
115 ms |
17092 KB |
Output is correct |
42 |
Correct |
81 ms |
17224 KB |
Output is correct |
43 |
Correct |
86 ms |
17104 KB |
Output is correct |
44 |
Correct |
88 ms |
17260 KB |
Output is correct |
45 |
Correct |
83 ms |
16976 KB |
Output is correct |
46 |
Correct |
104 ms |
17236 KB |
Output is correct |
47 |
Correct |
106 ms |
17212 KB |
Output is correct |
48 |
Correct |
87 ms |
16980 KB |
Output is correct |
49 |
Correct |
127 ms |
17932 KB |
Output is correct |
50 |
Correct |
110 ms |
17744 KB |
Output is correct |
51 |
Correct |
104 ms |
17744 KB |
Output is correct |
52 |
Correct |
162 ms |
20736 KB |
Output is correct |
53 |
Correct |
143 ms |
19504 KB |
Output is correct |
54 |
Correct |
145 ms |
19720 KB |
Output is correct |
55 |
Correct |
186 ms |
19704 KB |
Output is correct |
56 |
Correct |
212 ms |
22856 KB |
Output is correct |
57 |
Correct |
204 ms |
23332 KB |
Output is correct |
58 |
Correct |
222 ms |
24116 KB |
Output is correct |
59 |
Correct |
233 ms |
24132 KB |
Output is correct |
60 |
Correct |
203 ms |
24048 KB |
Output is correct |
61 |
Correct |
229 ms |
24012 KB |
Output is correct |
62 |
Correct |
181 ms |
22868 KB |
Output is correct |
63 |
Correct |
214 ms |
22872 KB |
Output is correct |
64 |
Correct |
232 ms |
23284 KB |
Output is correct |
65 |
Correct |
187 ms |
23044 KB |
Output is correct |
66 |
Correct |
252 ms |
23116 KB |
Output is correct |
67 |
Correct |
218 ms |
23572 KB |
Output is correct |