Submission #427122

#	Time	Username	Problem	Language	Result	Execution time	Memory
427122		Hazem	Ancient Books (IOI17_books)	C++14	12 / 100	103 ms	416 KiB

books

#include "books.h"
#include <bits/stdc++.h>
#define LL long long 
 
using namespace std;
 
const LL LINF  = 1e18;
 
int a[10],n;
vector<int>vec;
 
bool check(){
 
	bool q = 1;
	for(int i=0;i<n;i++)
		q &= (a[i]==vec[i]);
	
	return q;
}
 
LL bt(int pos,int cur,int cnt);
 
LL move(int pos,int cur,int cnt){
 
	LL ret = LINF;
	if(pos<n-1)
		ret = min(ret,bt(pos+1,cur,cnt+1));
	
	if(pos>0)
		ret = min(ret,bt(pos-1,cur,cnt+1));
 
	return ret;
}
 
LL bt(int pos,int cur,int cnt){
 
	if(!pos&&check())
		return cnt;
	
	if(cnt>10)
		return LINF;
 
	LL ret = LINF;
	ret = min(ret,move(pos,cur,cnt));
	
	swap(cur,a[pos]);
	if(!pos&&check())
		return cnt;
		
	ret = min(ret,move(pos,cur,cnt));
	swap(cur,a[pos]);
 
	return ret;
}
 
long long minimum_walk(std::vector<int> P, int s) {	
	
	vec = P;
	n = P.size();
	for(int i=0;i<n;i++)
		a[i] = i;
 
	LL ans = bt(0,-1,0);
	return ans;
}

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