#include <bits/stdc++.h>
#define ll long long
#include "books.h"
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define ar array
using namespace std;
template<typename T> bool ckmin(T &a, const T &b) { return a > b ? a = b, 1 : 0; }
template<typename T> bool ckmax(T &a, const T &b) { return a < b ? a = b, 1 : 0; }
struct seg {
int N; vector<vector<ar<int, 2>>> adj;
seg(int n) : N(1<<(__lg(n)+1)), adj(2*N) {
for (int i = 2; i < 2*N; i++) adj[i].push_back({i >> 1, 0});
}
void add_edge(int x, int y) {
adj[x+N].push_back({y+N, 1});
}
void add_edge(int node, int nl, int nr, int ql, int qr, int x) { // l and r go to x
if (ql > nr || qr < nl) return;
if (ql <= nl && nr <= qr) {
adj[node].push_back({x + N, 0});
return;
}
int mid = (nl+nr)/2;
add_edge(node * 2, nl, mid, ql, qr, x);
add_edge(node * 2 + 1, mid + 1, nr, ql, qr, x);
}
void bfs(vector<int>& dist, vector<int> nodes) {
vector<int> dist2(2 * N, 1e9);
for (int i = 0; i < sz(dist); i++) dist2[i + N] = dist[i];
deque<int> q;
vector<int> idx(sz(dist));
iota(all(idx), 0);
sort(all(idx), [&](int x, int y) { return dist[x] < dist[y]; });
int on = 1;
q.emplace_back(idx[0] + N);
while (q.size()) {
int v = q[0]; q.pop_front();
for (auto [u, w] : adj[v]) {
if (ckmin(dist2[u], dist2[v] + w)) {
if (!w) q.emplace_front(u);
else q.emplace_back(u);
}
}
if (on < sz(dist) && (q.empty() || dist[idx[on]] <= dist2[q[0]])) {
q.emplace_front(idx[on++] + N);
}
}
assert(on == sz(dist));
for (int i = 0; i < sz(dist); i++) dist[i] = dist2[i + N];
}
};
long long minimum_walk(std::vector<int> p, int s) {
int n = p.size();
int l = s, r = s;
bool f = 0;
for (int i = s; i >= 0; i--) if (i != p[i]) l = i, f = 1;
for (int i = s; i < n; i++) if (i != p[i]) r = i, f = 1;
if (!f) {
return 0;
}
seg st(n);
for (int i = 0; i < n; i++) {
if (i) st.add_edge(i, i-1);
if (i+1 < n) st.add_edge(i, i+1);
}
vector<bool> vis(n);
ll ans = 0;
for (int i = 0; i < n; i++) if (!vis[i]) {
int L = i, R = i, tmp = i;
vector<int> pth;
while (!vis[tmp]) {
ans += abs(tmp - p[tmp]);
ckmax(R, tmp), vis[tmp] = 1;
pth.emplace_back(tmp);
tmp = p[tmp];
}
for (int v : pth) st.add_edge(1, 0, st.N-1, L, R, v);
}
vector<int> d1(n, 1e9), d2(n, 1e9);
d1[l] = 0, d2[r] = 0;
st.bfs(d1, {l});
st.bfs(d2, {r});
vector<int> d3(n);
for (int i = 0; i < n; i++) d3[i] = d1[i] + d2[i];
vector<int> tot(n);
iota(all(tot), 0);
st.bfs(d3, tot);
return ans + 2 * d3[s];
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
344 KB |
Output is correct |
2 |
Correct |
0 ms |
344 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
344 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
1 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
0 ms |
344 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
348 KB |
Output is correct |
15 |
Correct |
0 ms |
348 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
0 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
344 KB |
Output is correct |
2 |
Correct |
0 ms |
344 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
344 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
1 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
0 ms |
344 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
348 KB |
Output is correct |
15 |
Correct |
0 ms |
348 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
0 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
1 ms |
604 KB |
Output is correct |
20 |
Correct |
1 ms |
604 KB |
Output is correct |
21 |
Correct |
0 ms |
348 KB |
Output is correct |
22 |
Correct |
0 ms |
604 KB |
Output is correct |
23 |
Correct |
0 ms |
604 KB |
Output is correct |
24 |
Correct |
1 ms |
600 KB |
Output is correct |
25 |
Correct |
1 ms |
604 KB |
Output is correct |
26 |
Correct |
1 ms |
604 KB |
Output is correct |
27 |
Correct |
1 ms |
604 KB |
Output is correct |
28 |
Correct |
1 ms |
676 KB |
Output is correct |
29 |
Correct |
1 ms |
604 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
344 KB |
Output is correct |
2 |
Correct |
0 ms |
344 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
344 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
1 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
0 ms |
344 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
348 KB |
Output is correct |
15 |
Correct |
0 ms |
348 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
0 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
1 ms |
604 KB |
Output is correct |
20 |
Correct |
1 ms |
604 KB |
Output is correct |
21 |
Correct |
0 ms |
348 KB |
Output is correct |
22 |
Correct |
0 ms |
604 KB |
Output is correct |
23 |
Correct |
0 ms |
604 KB |
Output is correct |
24 |
Correct |
1 ms |
600 KB |
Output is correct |
25 |
Correct |
1 ms |
604 KB |
Output is correct |
26 |
Correct |
1 ms |
604 KB |
Output is correct |
27 |
Correct |
1 ms |
604 KB |
Output is correct |
28 |
Correct |
1 ms |
676 KB |
Output is correct |
29 |
Correct |
1 ms |
604 KB |
Output is correct |
30 |
Correct |
1148 ms |
303584 KB |
Output is correct |
31 |
Correct |
1264 ms |
363364 KB |
Output is correct |
32 |
Correct |
51 ms |
8020 KB |
Output is correct |
33 |
Correct |
568 ms |
189444 KB |
Output is correct |
34 |
Correct |
572 ms |
189444 KB |
Output is correct |
35 |
Correct |
662 ms |
197376 KB |
Output is correct |
36 |
Correct |
751 ms |
219152 KB |
Output is correct |
37 |
Correct |
759 ms |
261884 KB |
Output is correct |
38 |
Correct |
777 ms |
284068 KB |
Output is correct |
39 |
Correct |
776 ms |
284420 KB |
Output is correct |
40 |
Correct |
795 ms |
303972 KB |
Output is correct |
41 |
Correct |
999 ms |
315628 KB |
Output is correct |
42 |
Correct |
977 ms |
358844 KB |
Output is correct |
43 |
Correct |
1446 ms |
215040 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
600 KB |
Output is correct |
2 |
Correct |
1 ms |
604 KB |
Output is correct |
3 |
Correct |
1 ms |
604 KB |
Output is correct |
4 |
Correct |
0 ms |
604 KB |
Output is correct |
5 |
Correct |
1 ms |
604 KB |
Output is correct |
6 |
Correct |
1 ms |
604 KB |
Output is correct |
7 |
Correct |
1 ms |
604 KB |
Output is correct |
8 |
Correct |
1 ms |
604 KB |
Output is correct |
9 |
Correct |
1 ms |
604 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
1 ms |
604 KB |
Output is correct |
12 |
Correct |
1 ms |
604 KB |
Output is correct |
13 |
Correct |
1 ms |
604 KB |
Output is correct |
14 |
Correct |
1 ms |
604 KB |
Output is correct |
15 |
Correct |
1 ms |
620 KB |
Output is correct |
16 |
Correct |
1 ms |
604 KB |
Output is correct |
17 |
Correct |
1 ms |
604 KB |
Output is correct |
18 |
Correct |
1 ms |
604 KB |
Output is correct |
19 |
Correct |
1 ms |
604 KB |
Output is correct |
20 |
Correct |
1 ms |
604 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
344 KB |
Output is correct |
2 |
Correct |
0 ms |
344 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
344 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
1 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
0 ms |
344 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
348 KB |
Output is correct |
15 |
Correct |
0 ms |
348 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
0 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
1 ms |
604 KB |
Output is correct |
20 |
Correct |
1 ms |
604 KB |
Output is correct |
21 |
Correct |
0 ms |
348 KB |
Output is correct |
22 |
Correct |
0 ms |
604 KB |
Output is correct |
23 |
Correct |
0 ms |
604 KB |
Output is correct |
24 |
Correct |
1 ms |
600 KB |
Output is correct |
25 |
Correct |
1 ms |
604 KB |
Output is correct |
26 |
Correct |
1 ms |
604 KB |
Output is correct |
27 |
Correct |
1 ms |
604 KB |
Output is correct |
28 |
Correct |
1 ms |
676 KB |
Output is correct |
29 |
Correct |
1 ms |
604 KB |
Output is correct |
30 |
Correct |
1148 ms |
303584 KB |
Output is correct |
31 |
Correct |
1264 ms |
363364 KB |
Output is correct |
32 |
Correct |
51 ms |
8020 KB |
Output is correct |
33 |
Correct |
568 ms |
189444 KB |
Output is correct |
34 |
Correct |
572 ms |
189444 KB |
Output is correct |
35 |
Correct |
662 ms |
197376 KB |
Output is correct |
36 |
Correct |
751 ms |
219152 KB |
Output is correct |
37 |
Correct |
759 ms |
261884 KB |
Output is correct |
38 |
Correct |
777 ms |
284068 KB |
Output is correct |
39 |
Correct |
776 ms |
284420 KB |
Output is correct |
40 |
Correct |
795 ms |
303972 KB |
Output is correct |
41 |
Correct |
999 ms |
315628 KB |
Output is correct |
42 |
Correct |
977 ms |
358844 KB |
Output is correct |
43 |
Correct |
1446 ms |
215040 KB |
Output is correct |
44 |
Correct |
1 ms |
600 KB |
Output is correct |
45 |
Correct |
1 ms |
604 KB |
Output is correct |
46 |
Correct |
1 ms |
604 KB |
Output is correct |
47 |
Correct |
0 ms |
604 KB |
Output is correct |
48 |
Correct |
1 ms |
604 KB |
Output is correct |
49 |
Correct |
1 ms |
604 KB |
Output is correct |
50 |
Correct |
1 ms |
604 KB |
Output is correct |
51 |
Correct |
1 ms |
604 KB |
Output is correct |
52 |
Correct |
1 ms |
604 KB |
Output is correct |
53 |
Correct |
0 ms |
348 KB |
Output is correct |
54 |
Correct |
1 ms |
604 KB |
Output is correct |
55 |
Correct |
1 ms |
604 KB |
Output is correct |
56 |
Correct |
1 ms |
604 KB |
Output is correct |
57 |
Correct |
1 ms |
604 KB |
Output is correct |
58 |
Correct |
1 ms |
620 KB |
Output is correct |
59 |
Correct |
1 ms |
604 KB |
Output is correct |
60 |
Correct |
1 ms |
604 KB |
Output is correct |
61 |
Correct |
1 ms |
604 KB |
Output is correct |
62 |
Correct |
1 ms |
604 KB |
Output is correct |
63 |
Correct |
1 ms |
604 KB |
Output is correct |
64 |
Correct |
937 ms |
189732 KB |
Output is correct |
65 |
Correct |
968 ms |
184120 KB |
Output is correct |
66 |
Correct |
907 ms |
263576 KB |
Output is correct |
67 |
Correct |
915 ms |
271876 KB |
Output is correct |
68 |
Correct |
63 ms |
25800 KB |
Output is correct |
69 |
Correct |
66 ms |
27336 KB |
Output is correct |
70 |
Correct |
66 ms |
25356 KB |
Output is correct |
71 |
Correct |
68 ms |
22964 KB |
Output is correct |
72 |
Correct |
56 ms |
21444 KB |
Output is correct |
73 |
Correct |
68 ms |
34292 KB |
Output is correct |
74 |
Correct |
575 ms |
189440 KB |
Output is correct |
75 |
Correct |
571 ms |
189476 KB |
Output is correct |
76 |
Correct |
1441 ms |
209048 KB |
Output is correct |
77 |
Correct |
1448 ms |
212120 KB |
Output is correct |
78 |
Correct |
1274 ms |
209560 KB |
Output is correct |
79 |
Correct |
1310 ms |
208852 KB |
Output is correct |
80 |
Correct |
57 ms |
8016 KB |
Output is correct |
81 |
Correct |
1058 ms |
349688 KB |
Output is correct |
82 |
Correct |
1076 ms |
349776 KB |
Output is correct |
83 |
Correct |
956 ms |
215936 KB |
Output is correct |
84 |
Correct |
969 ms |
220412 KB |
Output is correct |
85 |
Correct |
898 ms |
227332 KB |
Output is correct |
86 |
Correct |
861 ms |
246532 KB |
Output is correct |
87 |
Correct |
882 ms |
243784 KB |
Output is correct |
88 |
Correct |
935 ms |
223584 KB |
Output is correct |
89 |
Correct |
972 ms |
214124 KB |
Output is correct |
90 |
Correct |
906 ms |
272384 KB |
Output is correct |
91 |
Correct |
874 ms |
264192 KB |
Output is correct |
92 |
Correct |
897 ms |
302164 KB |
Output is correct |