제출 #1126029

#제출 시각아이디문제언어결과실행 시간메모리
1126029AverageAmogusEnjoyerFinancial Report (JOI21_financial)C++17
0 / 100
4094 ms14516 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); } 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]; }); vector<int> L(n),R(n),dp(n); auto Set = [&](vector<int> &v,int l,int r,int x) { for (;l<=r;l++) v[l]=x; }; auto Max = [&](int l,int r) { int res=0; for (;l<=r;l++) cmax(res,dp[l]); return res; }; set<int> active; for (int t=0,t2=0;t<n;t=t2) { vector<pair<int,int>> to_insert; while(t2 < n && a[order[t]] == a[order[t2]]) { int i=order[t2]; t2++; if (active.empty()) { L[i]=R[i]=i; to_insert.emplace_back(i,1); active.insert(i); continue; } auto it=active.lower_bound(i); if (it==active.end()) { --it; int bef=*it; if (bef < i - k) { L[i]=R[i]=i; to_insert.emplace_back(i,1); } else { int CL=L[bef],CR=i; Set(R,CL,CR,CR); Set(L,CL,CR,CL); to_insert.emplace_back(i,Max(CL,i)+1); } } else { if (it!=active.begin()) { auto it2=it; --it2; int bef=*it2,aft=*it; if (bef < i - k) { if (aft > i - k) { L[i]=R[i]=i; to_insert.emplace_back(i,1); } else { int CL=i,CR=R[aft]; Set(R,CL,CR,CR); Set(L,CL,CR,CL); to_insert.emplace_back(i,Max(CL,i)+1); } } else { if (aft > i - k) { int CL=L[bef],CR=i; Set(R,CL,CR,CR); Set(L,CL,CR,CL); to_insert.emplace_back(i,Max(CL,i)+1); } else { int CL=L[bef],CR=R[aft]; Set(R,CL,CR,CR); Set(L,CL,CR,CL); to_insert.emplace_back(i,Max(CL,i)+1); } } } else { int aft=*it; if (aft > i - k) { L[i]=R[i]=i; to_insert.emplace_back(i,1); } else { int CL=i,CR=R[aft]; Set(R,CL,CR,CR); Set(L,CL,CR,CL); to_insert.emplace_back(i,Max(CL,i)+1); } } } active.insert(i); } for (auto &[p,x]: to_insert) dp[p]=x; to_insert.clear(); } cout << *max_element(dp.begin(),dp.end()) << "\n"; }
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