You are given a string s of lower case english alphabets. You can choose any two characters in the string and replace all the occurences of the first character with the second character and replace all the occurences of the second character with the first character. Your aim is to find the lexicographically smallest string that can be obtained by doing this operation at most once. Example 1: Input: A = "ccad" Output: "aacd" Explanation: In ccad, we choose 'a' and 'c' and after doing the replacement operation once we get, aacd and this is the lexicographically smallest string possible.

You are given a string s of lower case english alphabets. You can choose any two characters in the string and replace all the occurences of the first character with the second character and replace all the occurences of the second character with the first character. Your aim is to find the lexicographically smallest string that can be obtained by doing this operation at most once. Example 1: Input: A = "ccad" Output: "aacd" Explanation: In ccad, we choose 'a' and 'c' and after doing the replacement operation once we get, aacd and this is the lexicographically smallest string possible.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Write a Python Program to Count Occurrences of a certain Character in a String. The user inputs a string value and the character to search. For example, if the string input value is PHILIPPINES and the character value is P, the output is value 3. There are 3 occurrences of P in the PHILIPPINES. The program must count the same character whether it is in lowercase or uppercase.
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Given two strings, s1 and s2, select only the characters in each string where the character at the same position in the other string is uppercase. Return them as a single string. To illustrate, given the strings s1 = "heLLo" and s2 = "GUlp", we select the letters "he" from s1 because "G" and "U" are uppercase letters. Then we select "lp" from s2 because "LL" is large. Finally, we merge them and return "help". Examples selectLetters ("heLLO", "GUlp") → "help" selectLetters ("1234567", "XXXXX") → "135" selectLetters ("EVERYTHING", "SomeThings") → "EYSomeThings"
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Design a program with an algorithm that will take a string from the user and then decide if each character in that string is unique. For example, if you ask the user to enter a string and that user enters the world ‘hello’, the result of the algorithm implementedshould return ‘false’ or ‘not unique’. If the user enters a string such as the word ‘phone’ the program will return ‘true’ or ‘unique’ since every character in the word phone is unique and is not repeated. An example of this program follows: Output should show as : enter a string rizma This string has all the unique characters would u like to continue?(y for yes n for no) y Enter a string waali This string is not unique Your code should work for all strings and essentially all characters, as many examples will be tested.
Given two strings, s1 and s2, select only the characters in each string where the character in the same position in the other string is in uppercase. Return these as a single string. To illustrate, given the strings s1 = "heLLo" and s2 = "GUlp", we select the letters "he" from s1, because "G" and "U" are uppercase. We then select "Ip" from s2, because "LL" is in uppercase. Finally, we join these together and return "help". Examples selectLetters("heLLO", "GUlp") "GUlp") → "help" selectLetters("1234567", "XxXxX") → "135" wwwwwwwwwww. selectLetters("EVERYTHING", "SomeThings")→ "EYSomeThings"
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