Submission #1053554

#	Time	Username	Problem	Language	Result	Execution time	Memory
1053554		Unforgettablepl	Ancient Books (IOI17_books)	C++17	12 / 100	2054 ms	412 KiB

books

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

const int THRESHOLD = 13;

long long minimum_walk(vector<int> p, int s) {
	int n = p.size();
	vector<int> res(n,-1);
	for(int i=0;i<n;i++)res[p[i]]=i;
	long long ans = 1e10;
	vector<int> curr(n);iota(curr.begin(), curr.end(),0);
	int currhand = 0;
	curr[0]=-1;
	function<void(int,long long,int)> calc = [&](int x,long long t,int moves) {
		if(moves>THRESHOLD)return;
		swap(currhand,curr[x]);
		if(curr==res) {
			ans = min(ans,t+x);
		} else for(int i=0;i<n;i++)if(i!=x) {
			calc(i,t+abs(x-i),moves+1);
		}
		swap(currhand,curr[x]);
	};
	calc(0,0,0);
	swap(curr[0],currhand);
	calc(0,0,0);
	return ans;
}

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