oj.uz

Submission #417413

# Submission time Handle Problem Language Result Execution time Memory
417413 2021-06-03T16:58:08 Z CSQ31 Rainforest Jumps (APIO21_jumps) C++14
4 / 100
 1180 ms 51220 KB 
#include "jumps.h"
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define sz(a) (int)(a.size())
typedef long long int ll;
typedef pair<int,int> pii;
typedef vector<vector<int>> vii;
const int MAXN = 2e5+5;
int l[20][MAXN],r[20][MAXN],high[20][MAXN];
vector<int>H;
void init(int n, vector<int>h){
	H = h;
	H.insert(H.begin(),1e9);
	h.pb(1e9);
	stack<pii>stk;
	for(int i=0;i<=n+1;i++){
		while(!stk.empty() && stk.top().fi < H[i])stk.pop();
		if(!stk.empty())l[0][i] = stk.top().se;
		else l[0][i] = i;
		stk.push({H[i],i});
	}
	while(!stk.empty())stk.pop();
	for(int i=n+1;i>=0;i--){
	    while(!stk.empty() && stk.top().fi < H[i])stk.pop();
		if(!stk.empty())r[0][i] = stk.top().se;
		else r[0][i] = i;
		stk.push({H[i],i});
	}
	for(int i=0;i<=n+1;i++){
		high[0][i] = (H[r[0][i]] > H[l[0][i]])?r[0][i]:l[0][i];
	}
	//cout<<high[0][1]<<'\n';
	for(int j=1;j<20;j++){
		for(int i=0;i<=n+1;i++){
			l[j][i] = l[j-1][l[j-1][i]];
			r[j][i] = r[j-1][r[j-1][i]];
			high[j][i] = high[j-1][high[j-1][i]];
		}
	}
	
}
//
int minimum_jumps(int a,int b,int c,int d){
	a++;
	b++;
	c++;
	d++;
	if(c-1 == b){
		return r[0][b] <=d?1:-1;
	}
	int mid = b+1; //mid just means bigger element in (b,c),cuz we have to cross mid regardless
	for(int i=19;i>=0;i--)if(r[i][mid] < c)mid = r[i][mid];
	if(r[0][mid] > d || r[0][b] > d)return -1;
	int cur = b;
	for(int i=19;i>=0;i--)if(l[i][cur] >= a && H[l[i][cur]] < H[mid])cur = l[i][cur]; //cur is where we should start from
	int ans= 0;
	//if(a == 1)cout<<l[0][cur]<<'\n';
	if(l[0][cur] >= a){
		if(r[0][l[0][cur]] <= d)return 1; //if this case fails it just means we can never ever again go left
	}else{
		for(int i=19;i>=0;i--){
			if(H[high[i][cur]] <= H[mid]){
				cur = high[i][cur];
				ans+=(1<<i);
			}
		}
		//if(a == 1)cout<<cur<<" "<<ans<<'\n';
		if(cur == mid)return r[0][mid] <=d?ans+1:-1;
		else if(high[0][cur] != 0 && r[0][high[0][cur]] <= d)return ans+2; 
	}
	for(int i=19;i>=0;i--){
		if(r[i][cur] < c){
			cur = r[i][cur];
			ans+=(1<<i);
		}
	}
	cur = r[0][cur];
	if(c<=cur && cur<=d)return ans+1;
	else return -1; 
	
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 584 KB Output is correct
2 Correct 1 ms 584 KB Output is correct
3 Correct 163 ms 41052 KB Output is correct
4 Correct 1123 ms 51180 KB Output is correct
5 Correct 942 ms 26152 KB Output is correct
6 Correct 1040 ms 51204 KB Output is correct
7 Correct 908 ms 35344 KB Output is correct
8 Correct 1180 ms 51220 KB Output is correct

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 584 KB Output is correct
2 Correct 1 ms 584 KB Output is correct
3 Incorrect 1 ms 584 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 584 KB Output is correct
2 Correct 1 ms 584 KB Output is correct
3 Incorrect 1 ms 584 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 584 KB Output is correct
2 Correct 1 ms 584 KB Output is correct
3 Incorrect 1 ms 584 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 584 KB Output is correct
2 Incorrect 1 ms 584 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 584 KB Output is correct
2 Incorrect 1 ms 584 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 584 KB Output is correct
2 Correct 1 ms 584 KB Output is correct
3 Correct 163 ms 41052 KB Output is correct
4 Correct 1123 ms 51180 KB Output is correct
5 Correct 942 ms 26152 KB Output is correct
6 Correct 1040 ms 51204 KB Output is correct
7 Correct 908 ms 35344 KB Output is correct
8 Correct 1180 ms 51220 KB Output is correct
9 Correct 1 ms 584 KB Output is correct
10 Correct 1 ms 584 KB Output is correct
11 Incorrect 1 ms 584 KB Output isn't correct
12 Halted 0 ms 0 KB -