This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
// #define int long long
#define fi first
#define se second
using namespace std;
const int inf = 1e9;
struct node {
int val;
int st, en;
node *left, *right;
void build(int start, int end) {
st = start;
en = end;
if (st == en) {
val = 0;
return;
}
int md = (st + en) / 2;
left = new node();
right = new node();
left->build(st, md);
right->build(md + 1, en);
val = max(left->val, right->val);
}
int query(int lf, int rg) {
if (st > rg || en < lf) return 0ll;
if (lf <= st && en <= rg) return val;
return max(left->query(lf, rg), right->query(lf, rg));
}
void update(int id, int x) {
if (st > id || en < id) return;
if (st == en) {
val = max(val, x);
return;
}
left->update(id, x);
right->update(id, x);
val = max(left->val, right->val);
}
} sg, sg2;
int32_t main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int n, x;
cin >> n >> x;
vector<int> a(n + 1), b;
for (int i = 1; i <= n; i++) {
cin >> a[i];
b.push_back(a[i]);
}
sort(b.begin(), b.end());
b.erase(unique(b.begin(), b.end()), b.end());
auto get = [&](int x) {
return upper_bound(b.begin(), b.end(), x) - b.begin();
};
int m = (int)b.size();
vector<int> dp(n + 1);
sg.build(1, m);
for (int i = n; i >= 1; i--) {
dp[i] = sg.query(get(a[i]) + 1, m) + 1;
sg.update(get(a[i]), dp[i]);
}
int ans = 0;
sg2.build(1, m);
for (int i = 1; i <= n; i++) {
ans = max(ans, dp[i] + sg2.query(1, get(a[i] - 1 + x)));
sg2.update(a[i], sg2.query(1, get(a[i]) - 1) + 1);
}
cout << ans << '\n';
return 0;
}
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