Submission #118293

#	Time	Username	Problem	Language	Result	Execution time	Memory
118293		tinjyu	Ancient Books (IOI17_books)	C++14	12 / 100	2 ms	384 KiB

books

#include "books.h"
#include <bits/stdc++.h>
using namespace std;
bool tag[1000005];
int a[1000005];
long long int ans;
int find(long long int x) 
{
	ans+=abs(x-a[x]);
	//cout<<x<<" "<<ans<<" "<<tag[x]<<endl;  

	if(tag[x]==1)return 0;
	tag[x]=1;
	if(x>a[x])
	{
		for(int i=a[x];i<=x;i++)
		{
			if(tag[i]==0)
			{
				tag[i]=1;
				find(a[i]);
			}
		}
	}
	else
	{
		for(int i=x;i<=a[x];i++)
		{
			if(tag[i]==0)
			{
				tag[i]=1;
				find(a[i]);
			}
		}
	}
	find(a[x]);
}
long long minimum_walk(std::vector<int> p, int s) {
	int n=p.size();
	for(int i=0;i<n;i++)a[i]=p[i];
	int t=0;
	for(int i=0;i<n;i++)
	{
		if(tag[i]==0)
		{
			//cout<<i<<" ";
			tag[i]=1;
			find(a[i]);
			if(a[i]!=i)t=max(t,i);
			//cout<<ans<<endl;
		}
	}
	ans+=t+t;
	return ans;
}

Compilation message (stderr)

books.cpp: In function 'int find(long long int)':
books.cpp:37:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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