Submission #833056

#	Time	Username	Problem	Language	Result	Execution time	Memory
833056		Lobo	Ancient Books (IOI17_books)	C++17	50 / 100	83 ms	8140 KiB

books

#include "books.h"
#include<bits/stdc++.h>
using namespace std;

#define int long long

long long minimum_walk(std::vector<int32_t> p, int32_t s) {
	// return 0;

	int l = 0;
	int r = (int) p.size()-1;

	while(l < s && p[l] == l) l++;
	while(r > s && p[r] == r) r--;

	if(r < l) return 0;
	// int n = p.size();
	int ans = 0;
	int max_reach = -1;
	for(int i = l; i <= r; i++) {
		ans+= abs(p[i]-i);
		if(i != l && max_reach < i) ans+= 2;
		max_reach = max(max_reach,(int) p[i]);
	}

	return ans;
}

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