Backspace String Comapre

Backspace String Compare


Given two strings S and T, return if they are equal when both are typed into empty text editors. # means a backspace character.

Sample input   1 : S = "ab#c"  T = "ad#c"
Sample output 1 : True
Explanation : Both S and T become "ac"

Sample input   2 : S = "a#c" T = "b"
Sample output 2 : False
Explanation : S become "c" but T become "b"

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#include <stdio.h>
#include<string.h>
char stack[100];
int top=-1;
//push character in to stack
void push(char cha)
{
    top++;
    stack[top]=cha;
}
//pop character from stack
int pop()
{
    stack[top]='\0'; //set empty character
    top--;
    if(top<-1) //this is incase ##abc 
    {           //if two ## come at the beginning
        top=-1;
    }
}
int main()
{
    char str1[20],str2[20];
    int len1,len2,i,j;
    gets(str1);
    gets(str2);
    len1=strlen(str1);
    len2=strlen(str2);
    for(i=0;i<len1;i++)
    {
        if(str1[i]=='#')
        {
            pop();
        }
        else
        {
            push(str1[i]);
        }
    }
    strcpy(str1,stack);
    top=-1;//reset the stack 
    for(j=0;j<len2;j++)
    {
        if(str2[j]=='#')
        {
            pop();
        }
        else
        {
            push(str2[j]);
        }
    }
    strcpy(str2,stack);
    if(strcmp(str2,str1)==0)
    {
        printf("True ( %s == %s )",str1,str2);
    }
    else
    {
        printf("False ( %s != %s )",str1,str2);
    }
    return 0;
}

OUTPUT :

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