C :

#include <stdio.h>
main() {
    char s[256],d[256];int i,j=0;
	scanf("%s",s);
	for(i=0;s[i]!='\0';i++){
		if(s[i]=='(' ||s[i]=='['){
			d[j]=s[i];j++;
		}
		if(s[i]==')'){
			if(d[j-1]=='(')j--;
				else {j--;break;}
		}
		if(s[i]==']'){
			if(d[j-1]=='[')j--;
				else {j--;break;}
		}		
	}
    if (j==0) printf("OK");
    	else printf("Wrong");	
} 

C++ :

#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
string s;
bool my_judge(string);
int main()
{
	//freopen("check10.in","r",stdin);
	//freopen("check10.out","w",stdout);
	cin>>s;
	if(my_judge(s))cout<<"OK"<<endl;
	else cout<<"Wrong"<<endl;
	return 0;
}
bool my_judge(string s)
{
	int top=0,i=0;
	char a[250];
	while(i<s.size())
	{
		if(s[i]=='(')
		{
			top++;
			a[top]='(';
		}
		if(s[i]=='[')
		{
			top++;
			a[top]='[';
		}
		if(s[i]==')')
		{
			if(top==0)return false;
			if(a[top]=='(') top--;
			else return false;
		}
		if(s[i]==']')
		{
			if(top==0)return false;
			if(a[top]=='[') top--;
			else return false;
		}
		i++;
	}
	if(top==0)return true;
}