Submission #1126033

#TimeUsernameProblemLanguageResultExecution timeMemory
1126033AverageAmogusEnjoyerFinancial Report (JOI21_financial)C++17
100 / 100
493 ms25100 KiB
#pragma GCC optimize("O3,unroll-loops") #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt") #include <bits/stdc++.h> using namespace std; using ll = long long; template<class T> bool cmin(T &i, T j) { return i > j ? i=j,true:false; } template<class T> bool cmax(T &i, T j) { return i < j ? i=j,true:false; } mt19937 mrand(chrono::steady_clock::now().time_since_epoch().count()); uniform_int_distribution<int> ui(0, 1 << 30); int rng() { return ui(mrand); } struct segment2 { int n; vector<int> st; segment2(int N) { n=N; st.resize(4*n); } int query(int l,int r,int u,int tl,int tr) { if (l > r) return 0; if (l == tl && r == tr) return st[u]; int mid=(tl+tr)/2; return max(query(l,min(mid,r),2*u,tl,mid),query(max(mid+1,l),r,2*u+1,mid+1,tr)); } int query(int l,int r) { return query(l,r,1,0,n-1); } void upd(int p,int x,int u,int tl,int tr) { if (tl == tr) { st[u]=x; return; } int mid=(tl+tr)/2; if (p <= mid) upd(p,x,2*u,tl,mid); else upd(p,x,2*u+1,mid+1,tr); st[u]=max(st[2*u],st[2*u+1]); } void upd(int p,int x) { upd(p,x,1,0,n-1); } }; struct DSU { int n; vector<int> sz,par; vector<int> lef; DSU(int N) { n=N; sz.assign(n,1); par.resize(n); iota(par.begin(),par.end(),0); lef=par; } int get(int u) { return par[u]==u?u:par[u]=get(par[u]); } void unite(int u,int v) { u=get(u),v=get(v); if (u==v) return; if (sz[u]<sz[v]) swap(u,v); sz[u]+=sz[v]; par[v]=u; lef[u]=min(lef[u],lef[v]); } }; int main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); int n,k; cin >> n >> k; vector<int> a(n); vector<int> order(n); for (int i=0;i<n;i++) cin >> a[i]; iota(order.begin(),order.end(),0); sort(order.begin(),order.end(),[&](int i,int j) { if (a[i]==a[j]) return i > j; return a[i] < a[j]; }); segment2 dp(n); set<int> active; DSU dsu(n); for (int t=0;t<n;t++) { int i=order[t]; auto it=active.lower_bound(i); if (it!=active.end() && *it <= i + k) dsu.unite(i,*it); if (it!=active.begin() && *prev(it) >= i - k) dsu.unite(*prev(it),i); int l=dsu.lef[dsu.get(i)]; // cout << l << endl; dp.upd(i,dp.query(l,i)+1); active.insert(i); } cout << dp.query(0,n-1) << endl; }
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