PAT乙级1045 快速排序 (25 分)

Posted 2021-08-08 辉小歌

题目地址

#include<cstdio>
#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
const int N=1e5+10;
int a[N],b[N];
vector<int>ans;
int main(void)
{
	int n; cin>>n;
	for(int i=0;i<n;i++) cin>>a[i],b[i]=a[i];
	sort(b,b+n);
	int temp=-9999; 
	for(int i=0;i<n;i++)
	{
		if(a[i]==b[i]&&a[i]>=temp) ans.push_back(a[i]);
        temp=max(temp,a[i]);
	}
	cout<<ans.size()<<endl;
	for(int i=0;i<ans.size();i++) 
	{
		cout<<ans[i];
		if(i+1!=ans.size()) cout<<" ";
	}
    cout<<endl;
	return 0;
}