#include <bits/stdc++.h>
using namespace std;
using lint = long long;
const lint INF = 1e15;
lint N, X;
lint A[200005];
lint lis[200005];
lint lds[200005];
pair<lint, lint> anslis[200005];
pair<lint, lint> anslds[200005];
lint LIS() {
for (int i = 0; i <= N; i++) lis[i] = INF, lds[i] = -INF;
lis[0] = -INF, lds[N] = INF;
lint res = 0;
for (lint i = 0, cur = 0; i < N; i++) {
lint j = upper_bound(lis, lis + N + 1, A[i] - X) - lis;
if (lis[j - 1] < A[i] - X && A[i] - X < lis[j]) lis[j] = A[i] - X, cur = max(cur, j);
anslis[i] = {j, lis[j]};
}
for (lint i = N - 1, cur = N - 1; i >= 0; i--) {
lint j = lower_bound(lds, lds + N + 1, A[i]) - lds;
if (j >= 1 && lds[j - 1] < A[i] && A[i] < lds[j]) lds[j - 1] = A[i], cur = min(cur, j - 1);
anslds[i] = {cur, lds[cur]};
}
for (lint i = 0; i <= N; i++) {
if (lis[i] < INF) res = max(res, i);
}
for (lint i = 0; i + 1 < N; i++) {
if (anslis[i].second < anslds[i + 1].second)
res = max(res, anslis[i].first + N - anslds[i + 1].first);
}
return res;
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> N >> X;
for (int i = 0; i < N; i++) cin >> A[i];
lint ans = LIS();
cout << ans << "\n";
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
376 KB |
Output is correct |
2 |
Correct |
2 ms |
380 KB |
Output is correct |
3 |
Correct |
2 ms |
376 KB |
Output is correct |
4 |
Correct |
2 ms |
376 KB |
Output is correct |
5 |
Correct |
2 ms |
376 KB |
Output is correct |
6 |
Correct |
2 ms |
376 KB |
Output is correct |
7 |
Correct |
2 ms |
380 KB |
Output is correct |
8 |
Correct |
2 ms |
376 KB |
Output is correct |
9 |
Correct |
2 ms |
376 KB |
Output is correct |
10 |
Correct |
2 ms |
376 KB |
Output is correct |
11 |
Correct |
2 ms |
376 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
376 KB |
Output is correct |
2 |
Correct |
2 ms |
380 KB |
Output is correct |
3 |
Correct |
2 ms |
376 KB |
Output is correct |
4 |
Correct |
2 ms |
376 KB |
Output is correct |
5 |
Correct |
2 ms |
376 KB |
Output is correct |
6 |
Correct |
2 ms |
376 KB |
Output is correct |
7 |
Correct |
2 ms |
380 KB |
Output is correct |
8 |
Correct |
2 ms |
376 KB |
Output is correct |
9 |
Correct |
2 ms |
376 KB |
Output is correct |
10 |
Correct |
2 ms |
376 KB |
Output is correct |
11 |
Correct |
2 ms |
376 KB |
Output is correct |
12 |
Correct |
2 ms |
376 KB |
Output is correct |
13 |
Correct |
2 ms |
376 KB |
Output is correct |
14 |
Correct |
2 ms |
376 KB |
Output is correct |
15 |
Correct |
2 ms |
376 KB |
Output is correct |
16 |
Correct |
2 ms |
376 KB |
Output is correct |
17 |
Correct |
2 ms |
376 KB |
Output is correct |
18 |
Correct |
2 ms |
376 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
376 KB |
Output is correct |
2 |
Correct |
2 ms |
380 KB |
Output is correct |
3 |
Correct |
2 ms |
376 KB |
Output is correct |
4 |
Correct |
2 ms |
376 KB |
Output is correct |
5 |
Correct |
2 ms |
376 KB |
Output is correct |
6 |
Correct |
2 ms |
376 KB |
Output is correct |
7 |
Correct |
2 ms |
380 KB |
Output is correct |
8 |
Correct |
2 ms |
376 KB |
Output is correct |
9 |
Correct |
2 ms |
376 KB |
Output is correct |
10 |
Correct |
2 ms |
376 KB |
Output is correct |
11 |
Correct |
2 ms |
376 KB |
Output is correct |
12 |
Correct |
2 ms |
376 KB |
Output is correct |
13 |
Correct |
2 ms |
376 KB |
Output is correct |
14 |
Correct |
2 ms |
376 KB |
Output is correct |
15 |
Correct |
2 ms |
376 KB |
Output is correct |
16 |
Correct |
2 ms |
376 KB |
Output is correct |
17 |
Correct |
2 ms |
376 KB |
Output is correct |
18 |
Correct |
2 ms |
376 KB |
Output is correct |
19 |
Incorrect |
2 ms |
504 KB |
Output isn't correct |
20 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
72 ms |
11344 KB |
Output is correct |
2 |
Correct |
71 ms |
11332 KB |
Output is correct |
3 |
Correct |
71 ms |
11252 KB |
Output is correct |
4 |
Correct |
73 ms |
11276 KB |
Output is correct |
5 |
Correct |
55 ms |
11260 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
19 ms |
3064 KB |
Output is correct |
2 |
Correct |
18 ms |
3064 KB |
Output is correct |
3 |
Correct |
18 ms |
3064 KB |
Output is correct |
4 |
Incorrect |
15 ms |
3192 KB |
Output isn't correct |
5 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
37 ms |
5852 KB |
Output is correct |
2 |
Correct |
35 ms |
5880 KB |
Output is correct |
3 |
Correct |
73 ms |
11228 KB |
Output is correct |
4 |
Correct |
55 ms |
11288 KB |
Output is correct |
5 |
Correct |
30 ms |
5880 KB |
Output is correct |
6 |
Correct |
51 ms |
10716 KB |
Output is correct |
7 |
Correct |
57 ms |
10716 KB |
Output is correct |
8 |
Correct |
34 ms |
5880 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
376 KB |
Output is correct |
2 |
Correct |
2 ms |
380 KB |
Output is correct |
3 |
Correct |
2 ms |
376 KB |
Output is correct |
4 |
Correct |
2 ms |
376 KB |
Output is correct |
5 |
Correct |
2 ms |
376 KB |
Output is correct |
6 |
Correct |
2 ms |
376 KB |
Output is correct |
7 |
Correct |
2 ms |
380 KB |
Output is correct |
8 |
Correct |
2 ms |
376 KB |
Output is correct |
9 |
Correct |
2 ms |
376 KB |
Output is correct |
10 |
Correct |
2 ms |
376 KB |
Output is correct |
11 |
Correct |
2 ms |
376 KB |
Output is correct |
12 |
Correct |
2 ms |
376 KB |
Output is correct |
13 |
Correct |
2 ms |
376 KB |
Output is correct |
14 |
Correct |
2 ms |
376 KB |
Output is correct |
15 |
Correct |
2 ms |
376 KB |
Output is correct |
16 |
Correct |
2 ms |
376 KB |
Output is correct |
17 |
Correct |
2 ms |
376 KB |
Output is correct |
18 |
Correct |
2 ms |
376 KB |
Output is correct |
19 |
Incorrect |
2 ms |
504 KB |
Output isn't correct |
20 |
Halted |
0 ms |
0 KB |
- |