Submission #286877

#	Time	Username	Problem	Language	Result	Execution time	Memory
286877		tmwilliamlin168	Ancient Books (IOI17_books)	C++14	50 / 100	196 ms	18936 KiB

books

#include "books.h"
#include <bits/stdc++.h>
using namespace std;

#define ll long long

ll minimum_walk(vector<int> p, int s) {
	int n=p.size();
	ll ans=0;
	vector<int> a(n);
	for(int i=0; i<n; ++i) {
		ans+=abs(i-p[i]);
		++a[min(i, p[i])];
		--a[max(i, p[i])];
	}
	for(int i=0; i+1<n; ++i) {
		a[i+1]+=a[i];
		ans+=2*!a[i];
	}
	for(int i=n-2; ~i&&!a[i]; --i)
		ans-=2*!a[i];
	return ans;
}

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