Submission #770125

#	Time	Username	Problem	Language	Result	Execution time	Memory
770125		APROHACK	Ancient Books (IOI17_books)	C++14	12 / 100	1 ms	316 KiB

books

#include "books.h"
#include <bits/stdc++.h>
#define ll long long 
#define ff first
#define ss second
#define pb push_back
using namespace std;
int n;
int startTo[1000000];

int searchR(int pos){
	for(int i = pos ; i < n ; i ++){
		if(startTo[i] != -1)return i;
	}
	return -1;
}
int searchL(int pos){
	for(int i = pos-1 ; i>= 0 ; i --){
		if(startTo[i] != -1)return i;
	}
	return -1;
}

long long minimum_walk(std::vector<int> p, int s) {
	n = p.size();
	int cont = 0;
	for(int i = 0 ; i < n ; i ++){
		startTo[i] = -1;
		if(p[i] > i){
			startTo[i] = p[i];
			cont ++;
		}
	}
	int pos = 0, temp;
	ll ans = 0;
	while(true){
		int nextR = searchR(pos);
		if(nextR != -1){
			ans += nextR-pos;
			pos = nextR;
			//cout << "move to " << nextR << endl;
			ans+= startTo[pos]-pos;
			temp = pos;
			pos = startTo[pos];
			
			//cout << "move to " << startTo[temp] << endl;
			startTo[temp] = -1;
			continue;
		}
		int nextL = searchL(pos);
		if(nextL != -1){
			ans += pos-nextL;
			pos = nextL;
			//cout << "move to " << nextL << endl;
			ans += startTo[pos] - pos;
			temp = pos;
			pos = startTo[pos];
			
			
			//cout << "move to " << startTo[temp] << endl;
			startTo[temp] = -1;
			continue;
		}
		ans+= pos;
		return ans;
	}
	
}

• Subtask 1: 12 / 12
• Subtask 2: 0 / 10
• Subtask 3: 0 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 30