제출 #1025944

#제출 시각아이디문제언어결과실행 시간메모리
1025944ttamxThe short shank; Redemption (BOI21_prison)C++17
100 / 100
374 ms275592 KiB
#include<bits/stdc++.h> using namespace std; const int INF=INT_MAX/2; int main(){ cin.tie(nullptr)->sync_with_stdio(false); int n,d,t; cin >> n >> d >> t; vector<int> a(n); for(auto &x:a)cin >> x; vector<int> pre(n,-1); stack<pair<int,int>> s; s.emplace(-INF,-1); int ans=0; for(int i=0;i<n;i++){ int x=min(a[i],t)-i; while(s.top().first>x)s.pop(); if(a[i]>t)pre[i]=s.top().second; else ans++; s.emplace(a[i]-i,i); } vector<pair<int,int>> range; for(int i=0;i<n;i++)if(pre[i]!=-1)range.emplace_back(pre[i],i-1); int m=range.size(); ans+=m; vector<vector<int>> g(m); vector<int> par(m,-1); stack<pair<int,int>> st; for(int i=0;i<m;i++){ int x=range[i].first; while(!st.empty()&&st.top().first>=x){ int j=st.top().second; st.pop(); g[i].emplace_back(j); par[j]=i; } st.emplace(x,i); } vector<int> b,dep(m),cnt(m+1); function<int(int)> dfs=[&](int u){ int deep=-1; for(auto v:g[u])if(dfs(v)>dep[u])dep[u]=dep[v],deep=v; for(auto v:g[u])if(v!=deep)cnt[dep[v]]++; return ++dep[u]; }; for(int i=0;i<m;i++)if(par[i]==-1)cnt[dfs(i)]++; for(int i=m;i>=0;i--)while(cnt[i]--&&d-->0)ans-=i; cout << ans; }
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