C :

#include<stdio.h>
#include<string.h>
int main(void)
{
    int left=0,right=0,t=0;
    char string[300];
    scanf("%s",string);
    for(int i=0;i<strlen(string);i++)
    {
        if(string[i]=='(')
        {
            left++;
            t++;
        }
        if(string[i]==')')
        {
            right++;
            if(t)t--;
        }
    }
    if(left==right&&t==0)
    printf("YES\n");
    else
    {
        printf("NO\n");
    }
    
}

C++ :

#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
string s;
bool my_judge(string);
int main()
{
	//freopen("stack10.in","r",stdin);
	//freopen("stack10.out","w",stdout);
	getline(cin,s);	
	if(my_judge(s))cout<<"YES"<<endl;
	else cout<<"NO"<<endl;
	return 0;	
}
bool my_judge(string c)
{
	int top=0,i=0;
	while(c[i]!='@')
	{
		if(c[i]=='(')top++;
		if(c[i]==')')
		{
			if(top>0)top--;
			else return false;
		}
		++i;
	}
	if(top==0)return true;
	else return false;
}

Pascal :

program acm21147;
var
 ch:char;  j:integer;
begin
 while not eoln do
  begin
   read(ch);
   if ch='(' then
    begin
     inc(j);
    end;
   if (ch=')') then
    begin
     dec(j);
    end;
   if j<0 then
    begin
     writeln('NO');
     halt;
    end;
  end;
 if j<>0 then writeln('NO')
 else writeln('YES');
end.

Python :

# coding=utf-8
import queue
s=queue.LifoQueue()
x=input()
for c in x:
    if c=='(':
        s.put(c)
    elif c==')':
        if not s.empty():
            s.get()
        else:
            s.put(1)
            break

if s.empty():
    print('YES')
else:
    print('NO')