제출 #421156

#제출 시각아이디문제언어결과실행 시간메모리
421156Jasiekstrz밀림 점프 (APIO21_jumps)C++17
23 / 100
4003 ms240064 KiB
#include "jumps.h" #include<bits/stdc++.h> #define fi first #define se second using namespace std; const int NN=2e5; const int PP=27e4; const int L=18; int n; int tab[NN+10]; int e[NN+10][2]; int jb[NN+10][L+2]; int js[NN+10][L+2]; int pot; set<pair<int,int>> tree[2*PP+10]; void upd_ans(int &ans,int i,int c) { auto it=tree[i].upper_bound({c,n+10}); if(it!=tree[i].begin() && (ans==-1 || prev(it)->fi>tab[ans])) ans=prev(it)->se; return; } int read_t(int l,int r,int c) // largest <=c { int ans=-1; for(l+=pot-1,r+=pot-1;l<=r;l/=2,r/=2) { if(l%2==1) upd_ans(ans,l++,c); if(r%2==0) upd_ans(ans,r--,c); } return ans; } void init(int N,vector<int> H) { n=N; tab[0]=tab[N+1]=N+10; e[0][0]=e[0][1]=0; e[N+1][0]=e[N+1][1]=N+1; for(int i=0;i<N;i++) tab[i+1]=H[i]; vector<int> st; st={0}; for(int i=1;i<=N;i++) { while(tab[st.back()]<tab[i]) { e[st.back()][1]=i; st.pop_back(); } e[i][0]=st.back(); st.push_back(i); } while(st.size()>1) { e[st.back()][1]=N+1; st.pop_back(); } for(int i=0;i<=N+1;i++) { if(tab[e[i][0]]>tab[e[i][1]]) swap(e[i][0],e[i][1]); js[i][0]=e[i][0]; jb[i][0]=e[i][1]; } for(int l=1;l<=L;l++) { for(int i=0;i<=N+1;i++) { js[i][l]=js[js[i][l-1]][l-1]; jb[i][l]=jb[jb[i][l-1]][l-1]; } } for(pot=1;pot<n;pot*=2); for(int i=1;i<=N;i++) { for(int j=i+pot-1;j>0;j/=2) tree[j].insert({tab[i],i}); } return; } int minimum_jumps(int A,int B,int C,int D) { A++;B++;C++;D++; int mx2g=read_t(C,D,n+10); int mx2=tab[mx2g]; int x=read_t(A,B,mx2); if(x==-1) return -1; int ans=0; #warning C==D for(int l=L;l>=0;l--) { if(tab[jb[x][l]]<=tab[C]) { x=jb[x][l]; ans+=(1<<l); } } for(int l=L;l>=0;l--) { if(tab[js[x][l]]<=tab[C]) { x=js[x][l]; ans+=(1<<l); } } if(x<C || D<x) return -1; return ans; }

컴파일 시 표준 에러 (stderr) 메시지

jumps.cpp:92:2: warning: #warning C==D [-Wcpp]
   92 | #warning C==D
      |  ^~~~~~~
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