제출 #981160

#제출 시각아이디문제언어결과실행 시간메모리
981160Darren0724밀림 점프 (APIO21_jumps)C++17
8 / 100
4082 ms5440 KiB
#include "jumps.h" #include <bits/stdc++.h> using namespace std; int n; vector<int> v,a,b; void init(int N, vector<int> H) { n=N; v=H; a.resize(n,-1); b.resize(n,-1); vector<int> st; for(int i=0;i<n;i++){ while(st.size()&&v[st.back()]<v[i]){ st.pop_back(); } a[i]=(st.size()?st.back():-1); st.push_back(i); } st.clear(); for(int i=n-1;i>=0;i--){ while(st.size()&&v[st.back()]<v[i]){ st.pop_back(); } b[i]=(st.size()?st.back():-1); st.push_back(i); } } int f(int A, int C) { int ans=0; int now=A; while(now!=C){ if(v[now]>v[C])return 1e9; if(a[now]==-1&&b[now]==-1){ return 1e9; } if(a[now]==-1)now=b[now]; else if(b[now]==-1)now=a[now]; else{ int g1=a[now],g2=b[now]; if(v[g1]<v[g2])swap(g1,g2); if(v[g1]<=v[C])now=g1; else if(v[g2]<=v[C])now=g2; else return 1e9; } ans++; } return ans; } int minimum_jumps(int A, int B, int C, int D) { int ans=1e9; for(int i=A;i<=B;i++){ for(int j=C;j<=D;j++){ ans=min(ans,f(i,j)); } } if(ans==1e9)ans=-1; return ans; }
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