Submission #1075825

#	Time	Username	Problem	Language	Result	Execution time	Memory
1075825		Abito	Ancient Books (IOI17_books)	C++17	0 / 100	0 ms	348 KiB

books

#include "books.h"
#include <bits/stdc++.h>
#define int long long
using namespace std;
const int N=1e6+5;
int a[N],par[N],sz[N],n;
bool vis[N];
int getpar(int x){
	if (x==par[x]) return x;
	return par[x]=getpar(par[x]);
}
void link(int x,int y){
	x=getpar(x);
	y=getpar(y);
	if (x==y) return;
	if (sz[x]>sz[y]) swap(x,y);
	sz[y]+=sz[x];
	par[x]=y;
}
long long minimum_walk(std::vector<int32_t> p, int32_t s) {
	n=p.size();int ans=0;
	for (int i=1;i<=n;i++) a[i]=p[i-1]+1,par[i]=i,sz[i]=1;
	for (int i=1;i<=n;i++) link(a[i],i),ans+=abs(a[i]-i);
	int x=0;
	for (int i=1;i<=n;i++){
		if (vis[getpar(i)] || sz[getpar(i)]==1) continue;
		x=i*2-2;
		vis[getpar(i)]=1;
	}
	return x+ans;
}

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