제출 #1025955

#제출 시각아이디문제언어결과실행 시간메모리
1025955ttamxThe short shank; Redemption (BOI21_prison)C++17
100 / 100
205 ms51284 KiB
#include<bits/stdc++.h> using namespace std; const int INF=INT_MAX/2; const int N=2e6+5; int n,d,t,ans; int a[N],pre[N],par[N],dep[N],deep[N],cnt[N]; stack<pair<int,int>> s,st; int main(){ cin.tie(nullptr)->sync_with_stdio(false); cin >> n >> d >> t; for(int i=1;i<=n;i++)cin >> a[i]; s.emplace(-INF,0); for(int i=1;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); } for(int i=1;i<=n;i++)if(pre[i]){ ans++; while(!st.empty()&&st.top().first>=pre[i]){ par[st.top().second]=i; st.pop(); } st.emplace(pre[i],i); } for(int i=1;i<=n;i++)if(pre[i]){ cnt[dep[deep[i]]]--; dep[i]=dep[deep[i]]+1; cnt[dep[i]]++; if(dep[i]>dep[deep[par[i]]])deep[par[i]]=i; } for(int i=n;i>=1;i--)while(cnt[i]--&&d-->0)ans-=i; cout << ans; }
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