Submission #489069

#	Time	Username	Problem	Language	Result	Execution time	Memory
489069		cfalas	Rainforest Jumps (APIO21_jumps)	C++14	27 / 100	1269 ms	76368 KiB

jumps

#include "jumps.h"
#include<bits/stdc++.h>
using namespace std;
#define mp make_pair
#define INF 10000000
#define MOD 1000000007
#define MID ((l+r)/2)
#define HASHMOD 2305843009213693951
#define ll long long
#define ull unsigned long long
#define F first
#define S second
typedef pair<ll, ll> ii;
typedef pair<ii, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef map<int, int> mii;

#define EPS 1e-6
#define FOR(i,n) for(int i=0;i<((int)(n));i++)
#define FORi(i,a,b) for(int i=((int)(a));i<((int)(b));i++)
#define FOA(v, a) for(auto v : a)

int t, n;
vi a, b;

vi nl, pl;

struct nodemax{
	nodemax* L=NULL, *R=NULL;
	int val=-1;

	void update(int x, int v, int l=0, int r=n-1){
		if(l==r && l==x){
			val = v;
			//cout<<l<<" "<<r<<" "<<val<<endl;
		}
		else if(l==r || l>x || r<x) return;
		else{
			if(!L) L = new nodemax();
			if(!R) R = new nodemax();
			val = -1;
			L->update(x, v, l, MID), val = max(val, L->val);
			R->update(x,v, MID+1,r), val = max(val, R->val);
			//cout<<l<<" "<<r<<" "<<val<<endl;
		}
	}

	int query(int rl, int rr, int l=0, int r=n-1){
		if(rl<=l && r<=rr) return val;
		else if(rl>r || l>rr) return -1;
		else {
			if(!L) L = new nodemax();
			if(!R) R = new nodemax();
			return max(L->query(rl, rr, l, MID), R->query(rl,rr,MID+1,r));
		}
	}
};
struct node{
	node* L=NULL, *R=NULL;
	int val=n;

	void update(int x, int v, int l=0, int r=n-1){
		if(l==r && l==x){
			val = v;
			//cout<<l<<" "<<r<<" "<<val<<endl;
		}
		else if(l==r || l>x || r<x) return;
		else{
			if(!L) L = new node();
			if(!R) R = new node();
			val = n;
			L->update(x, v, l, MID), val = min(val, L->val);
			R->update(x,v, MID+1,r), val = min(val, R->val);
			//cout<<l<<" "<<r<<" "<<val<<endl;
		}
	}

	int query(int rl, int rr, int l=0, int r=n-1){
		if(rl<=l && r<=rr) return val;
		else if(rl>r || l>rr) return n;
		else {
			if(!L) L = new node();
			if(!R) R = new node();
			return min(L->query(rl, rr, l, MID), R->query(rl,rr,MID+1,r));
		}
	}
};

node seg;
nodemax segm;
int hi[201000][20];
int lo[201000][20];
int le[201000][20];
void init(int N, std::vector<int> H) {
	n = N;
	a.resize(n);
	nl.resize(n+1);
	pl.resize(n);
	FOR(i,n) a[i] = H[i];
	
	FORi(i,1,n+1){
		//cout<<endl;
		nl[n-i] = seg.query(a[n-i], n-1);
		seg.update(a[n-i]-1, n-i);
	}
	nl[n] = n;
	FOR(i,n){
		//cout<<endl;
		pl[i] = segm.query(a[i], n-1);
		segm.update(a[i]-1, i);
	}
	FOR(i,n){
		if(nl[i]!=n && (pl[i]==-1 || a[nl[i]]>a[pl[i]])) hi[i][0] = nl[i];
		else hi[i][0] = pl[i];
		if(nl[i]!=n && (pl[i]==-1 || a[nl[i]]<a[pl[i]])) lo[i][0] = nl[i];
		else lo[i][0] = pl[i];
		if(hi[i][0] == -1) hi[i][0] = n;
		if(lo[i][0] == -1) lo[i][0] = n;
		le[i][0] = pl[i];
		if(le[i][0] == -1) le[i][0] = n;
	}
	lo[n][0] = n;
	hi[n][0] = n;
	le[n][0] = n;

	//FOR(i,n) cout<<hi[i][0]<<" "; cout<<" | "; FOR(i,n) cout<<lo[i][0]<<" "; cout<<endl;
	FORi(j,1,20){
		FOR(i,n+1){
			hi[i][j] = hi[hi[i][j-1]][j-1];
			lo[i][j] = lo[lo[i][j-1]][j-1];
			le[i][j] = le[le[i][j-1]][j-1];
			//cout<<hi[i][j]<<" ";
		}
		//cout<<endl;
	}
	//cout<<endl;
}

int minimum_jumps(int A, int B, int C, int D) {
	int s = B;
	int ans=0;
	for(int i=18;i>=0;i--){
		if(le[s][i]>=A && le[s][i]<=B) s = le[s][i];
		//cout<<s<<" ";
	}
	//cout<<endl;
	for(int i=18;i>=0;i--){
		if(hi[s][i]!=n && a[hi[s][i]]<=a[C]) s = hi[s][i], ans+=(1<<i);
		//cout<<s<<" ";
	}
	//cout<<endl;
	//cout<<s<<" "<<ans<<endl;
	for(int i=18;i>=0;i--){
		if(lo[s][i]!=n && a[lo[s][i]]<=a[C]) s = lo[s][i], ans+=(1<<i);
		//cout<<s<<" ";
	}
	//cout<<endl;
	//cout<<s<<" "<<ans<<endl;
	if(s>=C && s<=D) return ans;
	if(lo[s][0]>=C && lo[s][0]<=D) return ans+1;
	else return -1;
}

• Subtask 1: 4 / 4
• Subtask 2: 0 / 8
• Subtask 3: 0 / 13
• Subtask 4: 0 / 12
• Subtask 5: 23 / 23
• Subtask 6: 0 / 21
• Subtask 7: 0 / 19