제출 #532672

#제출 시각아이디문제언어결과실행 시간메모리
532672DanerZein밀림 점프 (APIO21_jumps)C++14
48 / 100
2660 ms86892 KiB
#include "jumps.h" #include <bits/stdc++.h> using namespace std; typedef vector<int> vi; const int MAX_N=2e5+10; const int MAX_P=MAX_N*4; int st[MAX_P]; int val[MAX_N]; int n; vector<vi> lo,hi; void init_tr(int node,int a,int b){ if(a==b){ st[node]=val[a]; return; } int mid=(a+b)/2,le=2*node+1,ri=2*node+2; init_tr(le,a,mid); init_tr(ri,mid+1,b); st[node]=max(st[le],st[ri]); } int query(int node,int a,int b,int l,int r){ if(b<l || a>r) return 0; if(l<=a && r>=b) return st[node]; int mid=(a+b)/2,le=2*node+1,ri=2*node+2; return max(query(le,a,mid,l,r),query(ri,mid+1,b,l,r)); } int izquier(int x){ int q=query(0,0,n-1,0,x); if(q==val[x]) return -1; int l=0,r=x; while(r-l>1){ int mid=(l+r)/2; q=query(0,0,n-1,mid,r); if(q>val[x]) l=mid; else r=mid; } return l; } int derecha(int x){ int q=query(0,0,n-1,x,n-1); if(q==val[x]) return -1; int l=x,r=n-1; while(r-l>1){ int mid=(l+r)/2; q=query(0,0,n-1,l,mid); if(q>val[x]) r=mid; else l=mid; } return r; } int sh[MAX_N][32]; int sl[MAX_N][32]; bool vis[MAX_N]; void low_edge(int u,int p,int he){ if(he>=1){ sl[u][0]=p; for(int i=1;i<30;i++){ if((1<<i)>he) break; sl[u][i]=sl[sl[u][i-1]][i-1]; } } vis[u]=1; for(auto &v:lo[u]){ if(!vis[v] && v!=p){ low_edge(v,u,he+1); } } } void high_edge(int u,int p,int he){ if(he>=1){ sh[u][0]=p; for(int i=1;i<30;i++){ if((1<<i)>he) break; sh[u][i]=sh[sh[u][i-1]][i-1]; } } vis[u]=1; for(auto &v:hi[u]){ if(!vis[v] && v!=p){ high_edge(v,u,he+1); } } } int ih[MAX_N],il[MAX_N]; void init(int N, std::vector<int> H) { for(int i=0;i<N;i++) val[i]=H[i]; hi.resize(N+1); lo.resize(N+1); n=N; memset(ih,0,sizeof ih); memset(il,0,sizeof il); init_tr(0,0,n-1); for(int i=0;i<n;i++){ int l=izquier(i); int r=derecha(i); if(r!=-1 && l!=-1){ if(val[r]>val[l]){ hi[r].push_back(i); lo[l].push_back(i); } else{ hi[l].push_back(i); lo[r].push_back(i); } ih[i]++; il[i]++; } else{ if(l!=-1) lo[l].push_back(i); if(r!=-1) lo[r].push_back(i); if(l!=-1 || r!=-1) il[i]++; } } memset(vis,0,sizeof vis); memset(sl,-1,sizeof sl); memset(sh,-1,sizeof sh); for(int i=n-1;i>=0;i--){ if(!il[i]) low_edge(i,i,0); } memset(vis,0,sizeof vis); for(int i=n-1;i>=0;i--){ if(!ih[i]) high_edge(i,i,0); } } int jumps(int A,int C){ int res=0; for(int i=29;i>=0;i--){ if(sh[A][i]!=-1 && val[sh[A][i]]<val[C]){ A=sh[A][i]; res+=(1<<i); } } if(val[sh[A][0]]==val[C]) return res+1; for(int i=29;i>=0;i--){ if(sl[A][i]!=-1 && val[sl[A][i]]<val[C]){ A=sl[A][i]; res+=(1<<i); } } if(val[sl[A][0]]==val[C]) return res+1; return -1; } int encontrar(int q,int l,int r){ if(query(0,0,n-1,l,l)==q) return l; while(r-l>1){ int mid=(l+r)/2; if(query(0,0,n-1,l,mid)>=q) r=mid; else l=mid; } return r; } int partir(int l,int r,int q){ int rr=r; while(r-l>1){ int mid=(l+r)/2; if(query(0,0,n-1,mid,r)<q) r=mid; else l=mid; } return encontrar(query(0,0,n-1,r,rr),r,rr); } int minimum_jumps(int A, int B, int C, int D) { if(query(0,0,n-1,A,B)<=val[C]){ A=encontrar(query(0,0,n-1,A,B),A,B); return jumps(A,C); } else{ A=partir(A,B,val[C]); return jumps(A,C); } }
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