제출 #953231

#제출 시각아이디문제언어결과실행 시간메모리
953231happy_nodeFinancial Report (JOI21_financial)C++17
100 / 100
399 ms39104 KiB
#include <bits/stdc++.h> using namespace std; const int MX=3e5+5; int dp[MX], R[MX]; struct segtree { pair<int,int> t[4*MX]; void update(int v, int l, int r, int pos, pair<int,int> val) { if(l>pos||r<pos) return; if(l==r) { t[v]=val; return; } int mid=(l+r)>>1; update(v*2+0,l,mid+0,pos,val); update(v*2+1,mid+1,r,pos,val); t[v]=max(t[v*2+0],t[v*2+1]); } pair<int,int> query(int v, int l, int r, int ql, int qr) { if(qr<l||r<ql) return make_pair(-1,-1); if(ql<=l&&qr>=r) return t[v]; int mid=(l+r)>>1; return max(query(v*2+0,l,mid+0,ql,qr), query(v*2+1,mid+1,r,ql,qr)); } void reset() { for(int i=0;i<4*MX;i++) { t[i]=make_pair(-1,-1); } } } st; int rev[MX]; struct DSU { int par[MX]; int find(int v) { return par[v]==v?v:par[v]=find(par[v]); } bool merge(int u, int v) { // v itu yang lebih gede u=find(u),v=find(v); if(u==v) return 0; par[u]=v; return 1; } void prep() { for(int i=0;i<MX;i++) par[i]=i; } } ds; int solveChallange(int N, int D, std::vector<int> H) { st.reset(); vector<pair<int,int>> ord; vector<int> P(N); for(int i=0;i<N;i++) { ord.push_back({H[i],-i}); } sort(ord.begin(),ord.end()); int cnt=1; for(auto [h,id]:ord) { id=-id; P[id]=cnt++; rev[P[id]]=id; // dapetin posisi dia } ds.prep(); set<int> pt; for(int i=1;i<=N;i++) { int p=rev[i]; auto it=pt.lower_bound(p); if(it!=pt.end()&&(*it)-p<=D) ds.merge(p,*it); if(it!=pt.begin()) { it--; if(p-(*it)<=D) ds.merge(*it,p); } pt.insert(p); R[p]=min(N-1,ds.find(p)+D); } for(int i=0;i<N;i++) { while(true) { auto [V,p]=st.query(1,1,N,1,P[i]-1); if(p==-1) break; if(R[p]<i) { st.update(1,1,N,P[p],make_pair(-1,-1)); continue; } dp[i]=V+1; break; } dp[i]=max(dp[i],1); st.update(1,1,N,P[i],make_pair(dp[i],i)); } return *max_element(dp,dp+N); } int main() { int N, D; std::vector<int> H; scanf("%d %d", &N, &D); H.resize(N); for (auto &elem : H) { scanf("%d", &elem); } int answer = solveChallange(N, D, H); printf("%d\n", answer); }

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int main()':
Main.cpp:114:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  114 |         scanf("%d %d", &N, &D);
      |         ~~~~~^~~~~~~~~~~~~~~~~
Main.cpp:117:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  117 |         scanf("%d", &elem);
      |         ~~~~~^~~~~~~~~~~~~
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