이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) ((int)x.size())
#define sumof(x) accumulate(all(x), 0ll)
struct ST_node{
int x;
ST_node (int a=0): x(a){}
friend ST_node sus(const ST_node& a, const ST_node& b){
return ST_node(max(a.x, b.x));
}
};
struct SegmentTree{
int n; vector<ST_node> t;
void init(int _n){
n=_n;
t.assign(4*n+1, ST_node());
}
void build(int k, int l, int r, int* a){
if (l==r){
t[k]=ST_node(a[l]);
return;
}
int mid=(l+r)>>1;
build(k<<1, l, mid, a);
build(k<<1|1, mid+1, r, a);
t[k]=sus(t[k<<1], t[k<<1|1]);
}
void init(int _n, int* a){
init(_n);
build(1, 1, n, a);
}
void update(int k, int l, int r, int pos, int val){
if (l==r){
t[k]=ST_node(val);
return;
}
int mid=(l+r)>>1;
if (pos<=mid) update(k<<1, l, mid, pos, val);
else update(k<<1|1, mid+1, r, pos, val);
t[k]=sus(t[k<<1], t[k<<1|1]);
}
ST_node get(int k, int l, int r, int L, int R){
if (r<L || R<l) return t[0];
if (L<=l && r<=R) return t[k];
int mid=(l+r)>>1;
return sus(get(k<<1, l, mid, L, R), get(k<<1|1, mid+1, r, L, R));
}
void update(int pos, int val){
update(1, 1, n, pos, val);
}
int get(int l, int r){
return get(1, 1, n, l, r).x;
}
} st;
const int N=3e5+1;
int n, d, a[N], f[N];
set<pair<int, int>> val[N];
void solve(int tc){
// cout << "Case #" << tc << ": ";
cin >> n >> d;
vector<int> v;
for (int i=1; i<=n; ++i) cin >> a[i], v.push_back(a[i]);
sort(all(v)); v.resize(unique(all(v))-v.begin());
for (int i=1; i<=n; ++i) a[i]=lower_bound(all(v), a[i])-v.begin()+1;
st.init(N);
for (int i=1; i<=n; ++i){
int g=1;
g=max(g, st.get(1, a[i]-1)+1);
g=max(g, st.get(a[i], N));
val[a[i]].emplace(g, i);
f[i]=g;
if (i>d){
val[a[i-d]].erase({f[i], i});
st.update(a[i-d], val[a[i-d]].empty()?0:val[a[i-d]].rbegin()->first);
}
}
cout << f[n];
}
int32_t main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int ntests=1;
// cin >> ntests;
for (int i=1; i<=ntests; ++i) solve(i);
return 0;
}
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