# Check whether two strings can be made equal by copying their characters with the adjacent ones

• Last Updated : 08 Jun, 2021

Given two strings str1 and str2, the task is to check whether both of the string can be made equal by copying any character of the string with its adjacent character. Note that this operation can be performed any number of times.
Examples:

Input: str1 = “abc”, str2 = “def”
Output: No
As all the characters in both the string are different.
So, there is no way they can be made equal.
Input: str1 = “abc”, str2 = “fac”
Output: Yes
str1 = “abc” -> “aac”
str2 = “fac” -> “aac”

Approach: In order for the strings to be made equal with the given operation, they have to be of equal lengths and there has to be at least one character which is common in both the strings. To check that, create a frequency array freq[] which will store the frequency of all the characters of str1 and then for every character of str2 if its frequency in str1 is greater than 0 then it is possible to make both the strings equal.
Below is the implementation of the above approach:

## C++

 `// C++ implementation of the approach``#include ``using` `namespace` `std;` `#define MAX 26` `// Function that returns true if both``// the strings can be made equal``// with the given operation``bool` `canBeMadeEqual(string str1, string str2)``{``    ``int` `len1 = str1.length();``    ``int` `len2 = str2.length();` `    ``// Lengths of both the strings``    ``// have to be equal``    ``if` `(len1 == len2) {` `        ``// To store the frequency of the``        ``// characters of str1``        ``int` `freq[MAX];``        ``for` `(``int` `i = 0; i < len1; i++) {``            ``freq[str1[i] - ``'a'``]++;``        ``}` `        ``// For every character of str2``        ``for` `(``int` `i = 0; i < len2; i++) {` `            ``// If current character of str2``            ``// also appears in str1``            ``if` `(freq[str2[i] - ``'a'``] > 0)``                ``return` `true``;``        ``}``    ``}` `    ``return` `false``;``}` `// Driver code``int` `main()``{``    ``string str1 = ``"abc"``, str2 = ``"defa"``;` `    ``if` `(canBeMadeEqual(str1, str2))``        ``cout << ``"Yes"``;``    ``else``        ``cout << ``"No"``;` `    ``return` `0;``}`

## Java

 `// Java implementation of the above approach``class` `GFG``{``    ``static` `int` `MAX = ``26``;``    ` `    ``// Function that returns true if both``    ``// the strings can be made equal``    ``// with the given operation``    ``static` `boolean` `canBeMadeEqual(String str1,``                                  ``String str2)``    ``{``        ``int` `len1 = str1.length();``        ``int` `len2 = str2.length();``    ` `        ``// Lengths of both the strings``        ``// have to be equal``        ``if` `(len1 == len2)``        ``{``    ` `            ``// To store the frequency of the``            ``// characters of str1``            ``int` `freq[] = ``new` `int``[MAX];``            ` `            ``for` `(``int` `i = ``0``; i < len1; i++)``            ``{``                ``freq[str1.charAt(i) - ``'a'``]++;``            ``}``    ` `            ``// For every character of str2``            ``for` `(``int` `i = ``0``; i < len2; i++)``            ``{``    ` `                ``// If current character of str2``                ``// also appears in str1``                ``if` `(freq[str2.charAt(i) - ``'a'``] > ``0``)``                    ``return` `true``;``            ``}``        ``}``        ``return` `false``;``    ``}``    ` `    ``// Driver code``    ``public` `static` `void` `main (String[] args)``    ``{``        ``String str1 = ``"abc"``, str2 = ``"defa"``;``    ` `        ``if` `(canBeMadeEqual(str1, str2))``            ``System.out.println(``"Yes"``);``        ``else``            ``System.out.println(``"No"``);``    ``}``}` `// This code is contributed by AnkitRai01`

## Python3

 `# Python3 implementation of the approach``MAX` `=` `26` `# Function that returns true if both``# the strings can be made equal``# with the given operation``def` `canBeMadeEqual(str1, str2):``    ``len1 ``=` `len``(str1)``    ``len2 ``=` `len``(str2)` `    ``# Lengths of both the strings``    ``# have to be equal``    ``if` `(len1 ``=``=` `len2):` `        ``# To store the frequency of the``        ``# characters of str1``        ``freq ``=` `[``0` `for` `i ``in` `range``(``MAX``)]``        ``for` `i ``in` `range``(len1):``            ``freq[``ord``(str1[i]) ``-` `ord``(``'a'``)] ``+``=` `1` `        ``# For every character of str2``        ``for` `i ``in` `range``(len2):` `            ``# If current character of str2``            ``# also appears in str1``            ``if` `(freq[``ord``(str2[i]) ``-` `ord``(``'a'``)] > ``0``):``                ``return` `True` `    ``return` `False` `# Driver code``str1 ``=` `"abc"``str2 ``=` `"defa"` `if` `(canBeMadeEqual(str1, str2)):``    ``print``(``"Yes"``)``else``:``    ``print``(``"No"``)` `# This code is contributed by Mohit Kumar`

## C#

 `// C# implementation of the above approach``using` `System;` `class` `GFG``{``    ``static` `int` `MAX = 26;``    ` `    ``// Function that returns true if both``    ``// the strings can be made equal``    ``// with the given operation``    ``static` `Boolean canBeMadeEqual(String str1,``                                   ``String str2)``    ``{``        ``int` `len1 = str1.Length;``        ``int` `len2 = str2.Length;``    ` `        ``// Lengths of both the strings``        ``// have to be equal``        ``if` `(len1 == len2)``        ``{``    ` `            ``// To store the frequency of the``            ``// characters of str1``            ``int` `[]freq = ``new` `int``[MAX];``            ` `            ``for` `(``int` `i = 0; i < len1; i++)``            ``{``                ``freq[str1[i] - ``'a'``]++;``            ``}``    ` `            ``// For every character of str2``            ``for` `(``int` `i = 0; i < len2; i++)``            ``{``    ` `                ``// If current character of str2``                ``// also appears in str1``                ``if` `(freq[str2[i] - ``'a'``] > 0)``                    ``return` `true``;``            ``}``        ``}``        ``return` `false``;``    ``}``    ` `    ``// Driver code``    ``public` `static` `void` `Main (String []args)``    ``{``        ``String str1 = ``"abc"``, str2 = ``"defa"``;``    ` `        ``if` `(canBeMadeEqual(str1, str2))``            ``Console.WriteLine(``"Yes"``);``        ``else``            ``Console.WriteLine(``"No"``);``    ``}``}` `// This code is contributed by Arnab Kundu`

## Javascript

 ``
Output:
`No`

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