全部WA掉了……

#include<bits/stdc++.h>
using namespace std;
int n,x,t;
long long ans;
set<int>s;
set<int>::iterator it,tmp;
inline int read(){
	int s=0,f=1;
	char ch=getchar();
	while (!isdigit(ch)){
		if (ch=='-') f=-1;
		ch=getchar();
	}
	while (isdigit(ch)){
		s=s*10+(ch-'0');
		ch=getchar();
	}
	return s*f;
}
int main(){
	n=read();
	s.insert(0);
	for (int i=1;i<=n;i++){
		x=read();
		it=s.lower_bound(x);
		if (it!=s.end()){
			if ((*it)==x) continue;
			tmp=it;
			tmp--;
			ans+=min(x-(*tmp),(*it)-x);
		}
		else{
			ans+=x-(*it);
			s.insert(x);
		}
	}
	printf("%d\n",ans);
	return 0;
}

谢谢！