OJ Board

Problem ID:727
Here is my code:
//polish notation
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
typedef struct node
{
char data;
struct node *next;
struct node *prev;
}node;
char a[1000][1000];
node* push(node *head,char ch)
{

node *cursor=head;
node *new_node=(node *)malloc(sizeof ...

Problem ID:727
Here is my code:
I can not understand why my code get RE .Please help me.
I did not get any reply though I sent another message .

Problem no:727
I got RE error but I can not what the problem is in my code.Please help me.