Submission #1052577

#TimeUsernameProblemLanguageResultExecution timeMemory
1052577user736482Rainforest Jumps (APIO21_jumps)C++17
37 / 100
4011 ms36004 KiB
#include<bits/stdc++.h> using namespace std; int lft[200007],rgt[200007],jmpl[200007][18],jmpg[200007][18]; bool czy1=1; bool odw[200007]; int n; vector<int>v; void init(int N,vector<int>V){ n=N; v=V; while(v.size()<200007) v.push_back(200006); stack<int>s; lft[200006]=200006; rgt[200006]=200006; //s.push(n); for(int i=0;i<n;i++){ lft[i]=200006; rgt[i]=200006; } //return; for(int i=0;i<n;i++){ if(s.empty() || v[s.top()]>v[i]) s.push(i); else{ rgt[s.top()]=i; s.pop(); i--; } } while(s.size()>0) s.pop(); for(int i=n-1;i>=0;i--){ if(s.empty() || v[s.top()]>v[i]) s.push(i); else{ czy1=0; lft[s.top()]=i; s.pop(); i++; } } for(int i=0;i<n;i++){ int pm=lft[i]; if(v[lft[i]]>v[rgt[i]]){ lft[i]=rgt[i]; rgt[i]=pm; } jmpg[i][0]=rgt[i]; jmpl[i][0]=lft[i]; } jmpl[200006][0]=200006; jmpg[200006][0]=200006; for(int i=1;i<18;i++){ for(int j=0;j<n;j++){ jmpl[j][i]=jmpl[jmpl[j][i-1]][i-1]; jmpg[j][i]=jmpg[jmpg[j][i-1]][i-1]; // cout<<jmpg[j][i]<<" "; } jmpl[200006][i]=200006; jmpg[200006][i]=200006; // cout<<"\n"; } //for(int i=0;i<n;i++) //cout<<lft[i]<<" "<<rgt[i]<<"\n"; } int minimum_jumps(int a,int b,int c,int d){ if(czy1) return c-b; int odp=0; if(a==b && c==d){ int akindex=-1; //int odp=0; while(v[jmpg[a][akindex+1]]<=v[c]) akindex++; if(akindex>=0){ odp+=1<<akindex; //cout<<akindex<<" a "; //return 0; //cout<<a<<" "; a=jmpg[a][akindex]; //cout<<a<<" "; akindex--;} while(akindex>=0){ if(v[jmpg[a][akindex]]>v[c]){ akindex--; continue; } odp+=1<<akindex; a=jmpg[a][akindex]; akindex--; //cout<<a<<" "; } akindex=-1; while(v[jmpl[a][akindex+1]]<=v[c]) akindex++; if(akindex>=0){ odp+=1<<akindex; //cout<<akindex<<" a "; //return 0; a=jmpl[a][akindex]; akindex--;} while(akindex>=0){ if(v[jmpl[a][akindex]]>v[c]){ akindex--; continue; } odp+=1<<akindex; a=jmpl[a][akindex]; akindex--; //cout<<a<<" "; } if(a!=c) odp=-1; //return odp; a=b; } odw[200006]=1; int ans[n]; for(int i=0;i<n;i++){ odw[i]=0; ans[i]=200007;} for(int i=a;i<=b;i++) odw[i]=1; priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>>pq; for(int i=a;i<=b;i++){ pq.push({0,i}); } while(!pq.empty()){ pair<int,int>pom=pq.top(); pq.pop(); ans[pom.second]=pom.first; if(!odw[lft[pom.second]]){ odw[lft[pom.second]]=1; pq.push({pom.first+1,lft[pom.second]}); } if(!odw[rgt[pom.second]]){ odw[rgt[pom.second]]=1; pq.push({pom.first+1,rgt[pom.second]}); } //return 0; } int mn=200007; for(int i=c;i<=d;i++){ mn=min(mn,ans[i]); } if(mn==200007) mn=-1; //cout<<ans[11]; //cout<<mn; return mn; }
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