Submission #105246

#	Time	Username	Problem	Language	Result	Execution time	Memory
105246		puyu_liao	Ancient Books (IOI17_books)	C++14	50 / 100	257 ms	8440 KiB

books

#include<bits/stdc++.h>
#include<stdio.h>
using namespace std;
#define IOS {cin.tie(0);ios_base::sync_with_stdio(false);}

#include"books.h"
typedef long long lll;
#define N 1000005
bitset<N> vis;

lll minimum_walk(vector<int> p,int s){
	vis.reset();
	int ll = s,rr = s,gl,gr;
	lll ans = 0;
	for(int i=0;i<p.size();) if(!vis[i]){
		gl = p.size()+1, gr = -1;
		int j = i;
		do{
			int t = j;
			if(vis[t]) {
				j++;
				continue;
			}
			vis[t] = 1;
			while(!vis[p[t]]){ 
				gl = min(gl,t); gr = max(gr,t);
				vis[p[t]] = 1;
				ans += abs(p[t] - t);
				t = p[t];
				gl = min(gl,t); gr = max(gr,t);
			}	
			ans += abs(p[t] - t);
			j++;
		}while(j<=gr);
		if(gl <= gr && gl < s) ll = min(ll,gl);
		if(gl <= gr && gr > s) rr = max(rr,gr);
		if(gl <= gr) ans -= 2*(gr - gl);
		i = j;
	}
	return ans + rr+rr-ll-ll;
}

Compilation message (stderr)

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

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