# | 제출 시각 | 아이디 | 문제 | 언어 | 결과 | 실행 시간 | 메모리 |
---|---|---|---|---|---|---|---|
952828 | onepunchac168 | 밀림 점프 (APIO21_jumps) | C++14 | 1034 ms | 77916 KiB |
이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include "jumps.h"
#include <vector>
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define mask(x) (1<<x)
typedef int ll;
typedef pair <ll,ll> ii;
const int N=2e5+5;
ll nxtb[N];
ll nxta[N];
int n;
ll a[N];
ll mx[20][N];
ll pos[N];
ll sa[N],sb[N];
ll nxt[N][20];
vector <ll> adj[N];
ll cha[N][20];
ll get(int u,int v)
{
ll kc=log2(v-u+1);
//cout<<u<<" "<<v<<" "<<kc<<" "<<mx[kc][u]<<" "<<mx[kc][v-mask(kc)+1]<<" "<<v<<" "<<mask(kc)<<'\n';
return max(mx[kc][u],mx[kc][v-mask(kc)+1]);
}
void dfs(int u)
{
for (auto v:adj[u])
{
cha[v][0]=u;
for (int i=1;i<=18;i++)
{
cha[v][i]=cha[cha[v][i-1]][i-1];
}
sa[v]=sa[u]+1;
dfs(v);
}
}
void init(int N, std::vector<int> H)
{
stack <ll> st;
n=N;
for (int i=1;i<=n;i++)
{
a[i]=H[i-1];
pos[a[i]]=i;
}
for (int i=1;i<=n;i++)
{
while (!st.empty()&&a[st.top()]<=a[i])
{
st.pop();
}
if (!st.empty())
{
nxta[i]=st.top();
}
else nxta[i]=0;
sa[i]=sa[nxta[i]]+1;
st.push(i);
}
while (!st.empty())
{
st.pop();
}
for (int i=n;i>=1;i--)
{
while (!st.empty()&&a[st.top()]<=a[i])
{
st.pop();
}
if (!st.empty())
{
nxtb[i]=st.top();
}
else nxtb[i]=n+1;
sb[i]=sb[nxtb[i]]+1;
st.push(i);
mx[0][i]=a[i];
if (nxtb[i]!=n+1)
{
ll rr=nxta[i];
if (a[nxta[i]]<a[nxtb[i]])
{
rr=nxtb[i];
}
nxta[i]=rr;
}
ll rr=nxta[i];
if (rr!=0&&rr!=n+1)
{
adj[rr].pb(i);
}
nxt[i][0]=nxtb[i];
for (int j=1;j<=18;j++)
{
nxt[i][j]=nxt[nxt[i][j-1]][j-1];
}
}
dfs(pos[n]);
for (int i=1;i<=18;i++)
{
for (int j=1;j<=n;j++)
{
mx[i][j]=max(mx[i-1][j],mx[i-1][j+mask(i-1)]);
}
}
}
const char nl='\n';
int minimum_jumps(int A, int B, int C, int D)
{
A++;
B++;
C++;
D++;
ll aa=get(C,D);
int left=A;
int right=B;
int ans=-1;
int gmax=1e9+5;
while (left<=right)
{
int mid=(left+right)/2;
if (get(mid,C-1)<aa)
{
ans=mid;
right=mid-1;
}
else left=mid+1;
}
//cout<<nl;
if (ans!=-1)
{
ll bb=pos[get(ans,B)];
ll cc=get(bb,C-1);
int left=C;
int res;
int right=D;
while (left<=right)
{
int mid=(left+right)/2;
if (get(C,mid)>cc)
{
res=mid;
right=mid-1;
}
else left=mid+1;
}
if (A!=B||C!=D){
gmax=min(gmax,minimum_jumps(bb-1,bb-1,res-1,res-1));
}
}
ll bb=pos[get(A,B)];
ll dd=0;
ll hh=0;
if (B+1<=C-1){hh=get(B+1,C-1);}
for (int i=18;i>=0;i--)
{
if (cha[bb][i]==0)
{
continue;
}
if (cha[bb][i]<C&&a[cha[bb][i]]<aa)
{
dd+=mask(i);
bb=cha[bb][i];
}
}
if (bb!=0&&bb<C&&a[bb]<aa)
{
for (int i=18;i>=0;i--)
{
if (nxt[bb][i]>=1&&nxt[bb][i]<=n)
{
if (nxt[bb][i]<C)
{
bb=nxt[bb][i];
dd+=mask(i);
}
}
}
bb=nxt[bb][0];
if (bb>=C&&bb<=D){
gmax=min(gmax,dd+1);
}
}
if (gmax==1e9+5)
{
return -1;
}
return gmax;
}
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