제출 #949770

#제출 시각아이디문제언어결과실행 시간메모리
949770Aiperiii밀림 점프 (APIO21_jumps)C++14
23 / 100
763 ms36564 KiB
#include <bits/stdc++.h> #include "jumps.h" //#define int long long #define ff first #define ss second #define pb push_back #define all(x) x.begin(),x.end() using namespace std; const int N=2e5+5; int jmp_high[N][20],jmp_low[N][20]; vector <int> h; int n; void init(int N,vector<int> H) { stack <int> st; n=N; for(int i=0;i<N;i++)h.pb(H[i]); h.pb(1e9);H.pb(1e9); vector <int> l(N+1,N),r(N+1,N); for(int i=0;i<N;i++){ while(!st.empty() && H[st.top()]<H[i]){ r[st.top()]=i; st.pop(); } st.push(i); } while(!st.empty())st.pop(); for(int i=N-1;i>=0;i--){ while(!st.empty() && H[st.top()]<H[i]){ l[st.top()]=i; st.pop(); } st.push(i); } for(int i=0;i<=N;i++){ if(H[l[i]]>H[r[i]]){ jmp_high[i][0]=l[i]; jmp_low[i][0]=r[i]; } else{ jmp_high[i][0]=r[i]; jmp_low[i][0]=l[i]; } } for(int k=1;k<20;k++){ for(int i=0;i<=N;i++){ jmp_high[i][k]=jmp_high[jmp_high[i][k-1]][k-1]; jmp_low[i][k]=jmp_low[jmp_low[i][k-1]][k-1]; } } } int minimum_jumps(int A, int B, int C, int D) { int ans=0; for(int k=19;k>=0;k--){ if(h[jmp_high[A][k]]<=h[C]){ A=jmp_high[A][k]; ans+=(1<<k); } } for(int k=19;k>=0;k--){ if(h[jmp_low[A][k]]<=h[C]){ A=jmp_low[A][k]; ans+=(1<<k); } } if(A==C)return ans; return -1; } /*signed main(){ ios_base::sync_with_stdio(); cin.tie(0);cout.tie(0); int n,q; cin>>n>>q; vector <int> a(n); for(int i=0;i<n;i++)cin>>a[i]; init(n,a); for(int i=0;i<q;i++){ int a,b,c,d; cin>>a>>b>>c>>d; cout<<minimum_jumps(a,b,c,d)<<"\n"; } }*/ /* 7 10 3 2 1 6 4 5 7 */
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