# Map every character of one string to another such that all occurrences are mapped to the same character

Given two string **s1** and **s2**, the task is to check if characters of the first string can be mapped with the character of the second string such that if a character **ch1** is mapped with some character **ch2** then all the occurrences of **ch1** will only be mapped with **ch2** for both the strings.

**Examples:**

Input:s1 = “axx”, s2 = “cbc”

Output:Yes

‘a’ in s1 can be mapped to ‘b’ in s2

and ‘x’ in s1 can be mapped to ‘c’ in s2.

Input:s1 = “a”, s2 = “df”

Output:No

**Approach:** If the lengths of both the strings are unequal then the strings cannot be mapped else create two frequency arrays **freq1[]** and **freq2[]** which will store the frequencies of all the characters of the given strings **s1** and **s2** respectively. Now, for every non-zero value in **freq1[]** find an equal value in **freq2[]**. If all the non-zero values from **freq1[]** can be mapped to some value in **freq2[]** then the answer is possible else not.

Below is the implementation of the above approach:

## C++

`// C++ implementation of the approach ` `#include <bits/stdc++.h> ` `using` `namespace` `std; ` ` ` `#define MAX 26 ` ` ` `// Function that returns true if the mapping is possible ` `bool` `canBeMapped(string s1, ` `int` `l1, string s2, ` `int` `l2) ` `{ ` ` ` ` ` `// Both the strings are of un-equal lengths ` ` ` `if` `(l1 != l2) ` ` ` `return` `false` `; ` ` ` ` ` `// To store the frequencies of the ` ` ` `// characters in both the string ` ` ` `int` `freq1[MAX] = { 0 }; ` ` ` `int` `freq2[MAX] = { 0 }; ` ` ` ` ` `// Update frequencies of the characters ` ` ` `for` `(` `int` `i = 0; i < l1; i++) ` ` ` `freq1[s1[i] - ` `'a'` `]++; ` ` ` `for` `(` `int` `i = 0; i < l2; i++) ` ` ` `freq2[s2[i] - ` `'a'` `]++; ` ` ` ` ` `// For every character of s1 ` ` ` `for` `(` `int` `i = 0; i < MAX; i++) { ` ` ` ` ` `// If current character is ` ` ` `// not present in s1 ` ` ` `if` `(freq1[i] == 0) ` ` ` `continue` `; ` ` ` `bool` `found = ` `false` `; ` ` ` ` ` `// Find a character in s2 that has frequency ` ` ` `// equal to the current character's ` ` ` `// frequency in s1 ` ` ` `for` `(` `int` `j = 0; j < MAX; j++) { ` ` ` ` ` `// If such character is found ` ` ` `if` `(freq1[i] == freq2[j]) { ` ` ` ` ` `// Set the frequnecy to -1 so that ` ` ` `// it doesn't get picked again ` ` ` `freq2[j] = -1; ` ` ` ` ` `// Set found to true ` ` ` `found = ` `true` `; ` ` ` `break` `; ` ` ` `} ` ` ` `} ` ` ` ` ` `// If there is no character in s2 ` ` ` `// that could be mapped to the ` ` ` `// current character in s1 ` ` ` `if` `(!found) ` ` ` `return` `false` `; ` ` ` `} ` ` ` ` ` `return` `true` `; ` `} ` ` ` `// Driver code ` `int` `main() ` `{ ` ` ` `string s1 = ` `"axx"` `; ` ` ` `string s2 = ` `"cbc"` `; ` ` ` `int` `l1 = s1.length(); ` ` ` `int` `l2 = s2.length(); ` ` ` ` ` `if` `(canBeMapped(s1, l1, s2, l2)) ` ` ` `cout << ` `"Yes"` `; ` ` ` `else` ` ` `cout << ` `"No"` `; ` ` ` ` ` `return` `0; ` `} ` |

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## Java

`// Java implementation of the approach ` `class` `GFG ` `{ ` ` ` ` ` `static` `int` `MAX = ` `26` `; ` ` ` ` ` `// Function that returns true if the mapping is possible ` ` ` `public` `static` `boolean` `canBeMapped(String s1, ` `int` `l1, ` ` ` `String s2, ` `int` `l2) ` ` ` `{ ` ` ` ` ` `// Both the strings are of un-equal lengths ` ` ` `if` `(l1 != l2) ` ` ` `return` `false` `; ` ` ` ` ` `// To store the frequencies of the ` ` ` `// characters in both the string ` ` ` `int` `[] freq1 = ` `new` `int` `[MAX]; ` ` ` `int` `[] freq2 = ` `new` `int` `[MAX]; ` ` ` ` ` `// Update frequencies of the characters ` ` ` `for` `(` `int` `i = ` `0` `; i < l1; i++) ` ` ` `freq1[s1.charAt(i) - ` `'a'` `]++; ` ` ` `for` `(` `int` `i = ` `0` `; i < l2; i++) ` ` ` `freq2[s2.charAt(i) - ` `'a'` `]++; ` ` ` ` ` `// For every character of s1 ` ` ` `for` `(` `int` `i = ` `0` `; i < MAX; i++) { ` ` ` ` ` `// If current character is ` ` ` `// not present in s1 ` ` ` `if` `(freq1[i] == ` `0` `) ` ` ` `continue` `; ` ` ` `boolean` `found = ` `false` `; ` ` ` ` ` `// Find a character in s2 that has frequency ` ` ` `// equal to the current character's ` ` ` `// frequency in s1 ` ` ` `for` `(` `int` `j = ` `0` `; j < MAX; j++) ` ` ` `{ ` ` ` ` ` `// If such character is found ` ` ` `if` `(freq1[i] == freq2[j]) ` ` ` `{ ` ` ` ` ` `// Set the frequnecy to -1 so that ` ` ` `// it doesn't get picked again ` ` ` `freq2[j] = -` `1` `; ` ` ` ` ` `// Set found to true ` ` ` `found = ` `true` `; ` ` ` `break` `; ` ` ` `} ` ` ` `} ` ` ` ` ` `// If there is no character in s2 ` ` ` `// that could be mapped to the ` ` ` `// current character in s1 ` ` ` `if` `(!found) ` ` ` `return` `false` `; ` ` ` `} ` ` ` ` ` `return` `true` `; ` ` ` `} ` ` ` ` ` `// Driver code ` ` ` `public` `static` `void` `main(String[] args) ` ` ` `{ ` ` ` `String s1 = ` `"axx"` `; ` ` ` `String s2 = ` `"cbc"` `; ` ` ` `int` `l1 = s1.length(); ` ` ` `int` `l2 = s2.length(); ` ` ` ` ` `if` `(canBeMapped(s1, l1, s2, l2)) ` ` ` `System.out.println(` `"Yes"` `); ` ` ` `else` ` ` `System.out.println(` `"No"` `); ` ` ` ` ` `} ` `} ` ` ` `// This code is contributed by ` `// sanjeev2552 ` |

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## Python3

`# Python 3 implementation of the approach ` ` ` `MAX` `=` `26` ` ` `# Function that returns true if the mapping is possible ` `def` `canBeMapped(s1, l1, s2, l2): ` ` ` `# Both the strings are of un-equal lengths ` ` ` `if` `(l1 !` `=` `l2): ` ` ` `return` `False` ` ` ` ` `# To store the frequencies of the ` ` ` `# characters in both the string ` ` ` `freq1 ` `=` `[` `0` `for` `i ` `in` `range` `(` `MAX` `)] ` ` ` `freq2 ` `=` `[` `0` `for` `i ` `in` `range` `(` `MAX` `)] ` ` ` ` ` `# Update frequencies of the characters ` ` ` `for` `i ` `in` `range` `(l1): ` ` ` `freq1[` `ord` `(s1[i]) ` `-` `ord` `(` `'a'` `)] ` `+` `=` `1` ` ` `for` `i ` `in` `range` `(l2): ` ` ` `freq2[` `ord` `(s2[i]) ` `-` `ord` `(` `'a'` `)] ` `+` `=` `1` ` ` ` ` `# For every character of s1 ` ` ` `for` `i ` `in` `range` `(` `MAX` `): ` ` ` `# If current character is ` ` ` `# not present in s1 ` ` ` `if` `(freq1[i] ` `=` `=` `0` `): ` ` ` `continue` ` ` `found ` `=` `False` ` ` ` ` `# Find a character in s2 that has frequency ` ` ` `# equal to the current character's ` ` ` `# frequency in s1 ` ` ` `for` `j ` `in` `range` `(` `MAX` `): ` ` ` `# If such character is found ` ` ` `if` `(freq1[i] ` `=` `=` `freq2[j]): ` ` ` `# Set the frequnecy to -1 so that ` ` ` `# it doesn't get picked again ` ` ` `freq2[j] ` `=` `-` `1` ` ` ` ` `# Set found to true ` ` ` `found ` `=` `True` ` ` `break` ` ` ` ` `# If there is no character in s2 ` ` ` `# that could be mapped to the ` ` ` `# current character in s1 ` ` ` `if` `(found` `=` `=` `False` `): ` ` ` `return` `False` ` ` ` ` `return` `True` ` ` `# Driver code ` `if` `__name__ ` `=` `=` `'__main__'` `: ` ` ` `s1 ` `=` `"axx"` ` ` `s2 ` `=` `"cbc"` ` ` `l1 ` `=` `len` `(s1) ` ` ` `l2 ` `=` `len` `(s2) ` ` ` ` ` `if` `(canBeMapped(s1, l1, s2, l2)): ` ` ` `print` `(` `"Yes"` `) ` ` ` `else` `: ` ` ` `print` `(` `"No"` `) ` ` ` `# This code is contributed by ` `# Surendra_Gangwar ` |

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## C#

`// C# implementation of the approach ` `using` `System; ` ` ` `class` `GFG ` `{ ` ` ` `static` `int` `MAX = 26; ` ` ` ` ` `// Function that returns true ` ` ` `// if the mapping is possible ` ` ` `public` `static` `Boolean canBeMapped(String s1, ` `int` `l1, ` ` ` `String s2, ` `int` `l2) ` ` ` `{ ` ` ` ` ` `// Both the strings are of un-equal lengths ` ` ` `if` `(l1 != l2) ` ` ` `return` `false` `; ` ` ` ` ` `// To store the frequencies of the ` ` ` `// characters in both the string ` ` ` `int` `[] freq1 = ` `new` `int` `[MAX]; ` ` ` `int` `[] freq2 = ` `new` `int` `[MAX]; ` ` ` ` ` `// Update frequencies of the characters ` ` ` `for` `(` `int` `i = 0; i < l1; i++) ` ` ` `freq1[s1[i] - ` `'a'` `]++; ` ` ` `for` `(` `int` `i = 0; i < l2; i++) ` ` ` `freq2[s2[i] - ` `'a'` `]++; ` ` ` ` ` `// For every character of s1 ` ` ` `for` `(` `int` `i = 0; i < MAX; i++) ` ` ` `{ ` ` ` ` ` `// If current character is ` ` ` `// not present in s1 ` ` ` `if` `(freq1[i] == 0) ` ` ` `continue` `; ` ` ` `Boolean found = ` `false` `; ` ` ` ` ` `// Find a character in s2 that has frequency ` ` ` `// equal to the current character's ` ` ` `// frequency in s1 ` ` ` `for` `(` `int` `j = 0; j < MAX; j++) ` ` ` `{ ` ` ` ` ` `// If such character is found ` ` ` `if` `(freq1[i] == freq2[j]) ` ` ` `{ ` ` ` ` ` `// Set the frequnecy to -1 so that ` ` ` `// it doesn't get picked again ` ` ` `freq2[j] = -1; ` ` ` ` ` `// Set found to true ` ` ` `found = ` `true` `; ` ` ` `break` `; ` ` ` `} ` ` ` `} ` ` ` ` ` `// If there is no character in s2 ` ` ` `// that could be mapped to the ` ` ` `// current character in s1 ` ` ` `if` `(!found) ` ` ` `return` `false` `; ` ` ` `} ` ` ` `return` `true` `; ` ` ` `} ` ` ` ` ` `// Driver code ` ` ` `public` `static` `void` `Main(String[] args) ` ` ` `{ ` ` ` `String s1 = ` `"axx"` `; ` ` ` `String s2 = ` `"cbc"` `; ` ` ` `int` `l1 = s1.Length; ` ` ` `int` `l2 = s2.Length; ` ` ` ` ` `if` `(canBeMapped(s1, l1, s2, l2)) ` ` ` `Console.WriteLine(` `"Yes"` `); ` ` ` `else` ` ` `Console.WriteLine(` `"No"` `); ` ` ` `} ` `} ` ` ` `// This code is contributed ` `// by PrinciRaj1992 ` |

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**Output:**

Yes

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