// #pragma GCC optimize("O3") // #pragma GCC optimization("Ofast,unroll-loops") // #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt") #include <bits/stdc++.h> using namespace std; #define int long long #define ll long long #define FOR(i, l, r) for (int i = (l); i <= (r); i++) #define FOD(i, r, l) for (int i = (r); i >= (l); i--) #define fi first #define se second #define pii pair<int, int> const ll mod = 1e9 + 7; const int MAXN = 1e6 + 5; const ll oo = 1e18 + 7; const int base = 10; int n, d, a[MAXN], b[MAXN]; int st[4*MAXN]; void update(int id, int l, int r, int i, int val){ if(l>i || r<i){ return; } if(l>=r){ st[id]=val; return; } int mid=(l+r)/2; update(id*2, l, mid, i, val); update(id*2+1, mid+1, r, i, val); st[id]=max(st[id*2], st[id*2+1]); } int get(int id, int l, int r, int i, int j){ if(l>j || r<i){ return 0; } if(l>=i && r<=j){ return st[id]; } int mid=(l+r)/2; return max(get(id*2, l, mid, i, j), get(id*2+1, mid+1, r, i, j)); } vector<int> nen; unordered_map<int, int> mp, kt; int f[MAXN]; signed main() { ios_base::sync_with_stdio(false); cin.tie(NULL); // freopen("test.txt", "r", stdin); // freopen("o2.out", "w", stdout); if(fopen(".inp", "r")){ freopen(".inp", "r", stdin); freopen(".out", "w", stdout); } cin >> n >> d; FOR(i, 1, n){ cin >> a[i]; } FOR(i, 1, n){ nen.push_back(a[i]); } sort(nen.begin(), nen.end()); FOR(i, 1, n){ mp[a[i]]++; b[i]=lower_bound(nen.begin(), nen.end(), a[i])-nen.begin()+mp[a[i]]; kt[a[i]]=b[i]; } int res=0; FOD(i, n, 1){ if(i+d+1<=n){ update(1, 1, n, b[i+d+1], 0); } int ans=get(1, 1, n, kt[a[i]]+1, n)+1; f[i]=ans; res=max(res, ans); update(1, 1, n, b[i], f[i]); } cout << res; return 0; }

Main.cpp: In function 'int main()':
Main.cpp:62:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |         freopen(".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
Main.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen(".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~