Submission #72055052

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
inline int read()
{
	int x=0,f=1;char ch=getchar();
	while (ch<'0'||ch>'9'){if (ch=='-') f=-1;ch=getchar();}
	while (ch>='0'&&ch<='9'){x=x*10+ch-48;ch=getchar();}
	return x*f;
}
void out(int x)
{
    if(x<0)putchar('-'),x=-x;
    if(x<10)putchar(x+'0');
    else out(x/10),putchar(x%10+'0');
}
int n;
stack<int>q;
int main(){
	n=read();
	for(int i=1;i<=n;i++){
		int p=read();
		q.push(p);
		if(q.size()>=4){
			int a=q.top();
			q.pop();
			int b=q.top();
			q.pop();
			int c=q.top();
			q.pop();
			int d=q.top();
			q.pop();
			if(!(a==b&&b==c&&c==d)){
				q.push(d);
				q.push(c);
				q.push(b);
				q.push(a);
			}
		}
	}
	cout<<q.size();
	return 0;
}

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