Submission #641439

#	Time	Username	Problem	Language	Result	Execution time	Memory
641439		ggoh	고대 책들 (IOI17_books)	C++14	12 / 100	2085 ms	312 KiB

books

#include "books.h"
#include<bits/stdc++.h>
using namespace std;
#define sz(v) ((int)(v).size())
typedef long long lint;

int b,n,sz,cnt;
int v[1000002],rev[1000002];
vector<int>go;
lint ans=0;
void dfs(int p,int q)
{
  if(b==-1)
  {
    ans+=p;
    return ;
  }
  if(q==b)
  {
    if(p==b)
    {
      int tmp=go[p];
      go[p]=q;
      while(b-1>=0 && go[b-1]==b-1)b--;
      b--;
      dfs(p,tmp);
    }
    else
    {
      ans+=abs(p-b);
      dfs(b,q);
    }
    return ;
  }
  if(go[p]==p)
  {
    ans++;
    if(rev[b]>p)dfs(p+1,q);
    else dfs(p-1,q);
  }
  else
  {
    int tmp=go[p];
    go[p]=q;
    if(tmp==b)
    {
      dfs(p,tmp);
      return ;
    }
    ans++;
    if(rev[b]>p)dfs(p+1,tmp);
    else dfs(p-1,tmp);
  }
}

lint minimum_walk(vector<int> p, int s) {
  n=sz(p);
  go=p;
  for(int i=0;i<n;i++)rev[go[i]]=i;
  b=n;
  while(b-1>=0 && go[b-1]==b-1)b--;
  b--;
  dfs(0,-1);
	return ans;
}

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