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4. Excel Column Number Conversion Given a column title as it appears in an Excel sheet, your task is to return its corresponding column number. Example: Input: S = "AB" Output: 28 Explanation: The sequence is as follows:A -> 1B -> 2C -> 3...Z -> 26AA -> 27AB -> 28 Constraints: 1 <= |S| <= 10 S consists only of uppercase English Alphabet letters Note: Consider implementing the function to convert the Excel column title to a number. You do not have to handle input/output explicitly.
5. Check Permutation Problem Determine if two given strings, str1 and str2, are permutations of each other. Explanation: Two strings are permutations of each other if the characters of one string can be rearranged to form the other string. Input: The first line contains a string 'str1'.The second line contains a string 'str2'. Output: Returns 'true' if the two strings are permutations of each other, otherwise returns 'false'. Example: Input:str1 = 'sinrtg'str2 = 'string'Output:trueExplanation:The characters in str1 can be rearranged to form str2. Constraints: 0 <= N <= 106, where N is the length of the input string. All input string characters are in lowercase. Time Limit: 1 second Note: Implementation only; no need for input/output operations.