Submission #469257

#TimeUsernameProblemLanguageResultExecution timeMemory
469257kderyloThe short shank; Redemption (BOI21_prison)C++17
80 / 100
2100 ms377644 KiB
#include <iostream> #include <vector> using namespace std; const int stala=2097152; int tab[stala]; int przedzial[stala]; vector<int>wektor; vector<int>wektor2; vector<int>tree[2*stala]; bool odwiedzony[stala]; int w[4*stala]; int W[4*stala]; int ind[4*stala]; int maks_index; void update(int index,int index2,int war) { index=index+stala-1; index2=index2+stala-1; w[index]+=war; if(index!=index2) { w[index2]+=war; } while(index>0) { if(index/2!=index2/2) { if(index%2==0) { w[index+1]+=war; W[index+1]=w[index+1]+max(W[2*(index+1)],W[(2*(index+1))+1]); if(index<stala) { ind[index+1]=(W[2*(index+1)]>W[(2*(index+1))+1]) ? ind[2*(index+1)]:ind[(2*(index+1))+1]; } } if(index2%2==1) { w[index2-1]+=war; W[index2-1]=w[index2-1]+max(W[2*(index2-1)],W[(2*(index2-1))+1]); if(index2<stala) { ind[index2-1]=(W[2*(index2-1)]>W[(2*(index2-1))+1]) ? ind[2*(index2-1)]:ind[(2*(index2-1))+1]; } } } W[index]=w[index]+max(W[2*index],W[(2*index)+1]); W[index2]=w[index2]+max(W[2*index2],W[(2*index2)+1]); if(index<stala) { ind[index]=(W[2*index]>W[(2*index)+1]) ? ind[2*index]:ind[(2*index)+1]; } if(index2<stala) { ind[index2]=(W[2*index2]>W[(2*index2)+1]) ? ind[2*index2]:ind[(2*index2)+1]; } index=index/2; index2=index2/2; } } int query(int index,int index2) { maks_index=0; index=index+stala-1; index2=index2+stala-1; int resp=0; int resl=0; int indp=ind[index2]; int indl=ind[index]; while(index>0) { resl+=w[index]; resp+=w[index2]; if((index/2)!=(index2/2)) { if(index%2==0) { indl=(resl>W[index+1]) ? indl:ind[index+1]; resl=max(resl,W[index+1]); } if(index2%2==1) { indp=(resp>W[index2-1]) ? indp:ind[index2-1]; resp=max(resp,W[index2-1]); } } index=index/2; index2=index2/2; } maks_index=(resp>resl) ? indp:indl; return max(resp,resl); } void pre() { for(int i=stala;i<2*stala;i++) { ind[i]=i-stala+1; } for(int i=stala-1;i>=1;i--) { ind[i]=ind[2*i]; } } void update2(int x1,int x2,int index) { x1+=stala-1; x2+=stala-1; tree[x1].push_back(index); if(x1!=x2) { tree[x2].push_back(index); } while(x1/2!=x2/2) { if(x1%2==0) { tree[x1+1].push_back(index); } if(x2%2==1) { tree[x2-1].push_back(index); } x1/=2; x2/=2; } } void query2(int x1) { x1+=stala-1; while(x1>0) { for(int i=0;i<(int)tree[x1].size();i++) { if(odwiedzony[tree[x1][i]]==0) { odwiedzony[tree[x1][i]]=1; update(przedzial[tree[x1][i]],tree[x1][i]-1,-1); } } tree[x1].clear(); x1/=2; } } int main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int ile,materace,t; cin>>ile>>materace>>t; for(int i=1;i<=ile;i++) { cin>>tab[i]; } for(int i=1;i<=ile;i++) { if(tab[i]<=t) { int index=min(ile,t-tab[i]+i); while(!wektor.empty()&&wektor.back()<=index) { wektor.pop_back(); wektor2.pop_back(); } wektor.push_back(index); wektor2.push_back(i); przedzial[i]=i; } else if(!wektor.empty()) { przedzial[i]=wektor2.back(); } else { przedzial[i]=-1; } if(!wektor.empty()) { if(wektor.back()==i) { wektor.pop_back(); wektor2.pop_back(); } } } pre(); int nie=0; for(int i=1;i<=ile;i++) { if(przedzial[i]==-1) { nie++; } else if(przedzial[i]<i) { update(przedzial[i],i-1,1); update2(przedzial[i],i-1,i); } } for(int i=1;i<=materace;i++) { nie+=query(1,ile); query2(maks_index); } cout<<ile-nie; return 0; }
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