Submission #71604

#	Time	Username	Problem	Language	Result	Execution time	Memory
71604		idan_izmirli	Ancient Books (IOI17_books)	C++14	50 / 100	209 ms	10176 KiB

books

#include "books.h"

long long minimum_walk(std::vector<int> p, int s) {
	long long result=-2;
	int current_max=0;
	for(int i=0;i<p.size();i++)
	{
		if(p[i]<i)
		{
			result+=i-p[i];
		}
		else
		{
			result+=p[i]-i;
		}
      	if(p[i]>current_max)
		{
			current_max=p[i];
		}
		if(current_max==i)
		{
			result+=2;
		}
	}
	for(int i=0;i<s;i++)
	{
		if(p[i]!=i)
		{
			break;
		}
		result-=2;
	}
	for(int i=p.size()-1;i>s;i--)
	{
		if(p[i]!=i)
		{
			break;
		}
		result-=2;
	}
	return result;
}

Compilation message (stderr)

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:6:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<p.size();i++)
              ~^~~~~~~~~

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