Check if a string can become empty by recursively deleting a given sub-string in C++

Suppose, we are given two strings, str1 and str2. str2 is a substring of str1, and we can delete str2 from str1. It is possible, that the string str2 appears multiple times in str1. Our goal here is to find out if str1 becomes a null string if we keep removing str2 from str1 multiple times. If it is possible we return 1, otherwise 0.

So, if the input is like str1 = "CCCPPPPPP", str2 = "CPP"; then the output will be true.

To solve this, we will follow these steps −

• while size of str1 > 0, do −
  • index := return the string start position of str2 in str1
  • if index is same as -1, then −
    • Come out from the loop
  • delete str2 from str1
• return 1 if size of str1 is similar to 0, otherwise 0.

Example (C++)

Let us see the following implementation to get better understanding −

 Live Demo

#include<bits/stdc++.h>
using namespace std;
bool solve(string str1, string str2) {
   while (str1.size() > 0) {
      int index = str1.find(str2);
      if (index == -1)
      break;
      str1.erase(index, str2.size());
   }
   return (str1.size() == 0);
}
int main() {
   string str1 = "CCCPPPPPP", str2 = "CPP";
   cout<<solve(str1, str2)<<endl;
   return 0;
}

Input

"CCCPPPPPP", "CPP"

Output

1

Arnab Chakraborty

Published on 18-Jan-2021 11:45:26

• Related Questions & Answers
• Check if a string can become empty by recursively deleting a given sub-string in Python
• String slicing in Python to check if a can become empty by recursive deletion
• Check if a string contains a sub-string in C++
• How to check if a string contains a specific sub string?
• Check if a given string is sum-string in C++
• Check if a string contains a palindromic sub-string of even length in C++
• Check If a String Can Break Another String in C++
• Method to check if a String contains a sub string ignoring case in Java
• Check if a string contains a palindromic sub-string of even length in Python
• Meta Strings (Check if two strings can become same after a swap in one string) in C++
• Check if given string can be formed by concatenating string elements of list in Python
• Check if a given string is a valid number in C++
• Write a program in C++ to check if a string can be obtained by rotating another string by two places
• How to check if a string is empty in Kotlin?
• C Program to Check if a Given String is a Palindrome?