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# Exercise Title Features Description Platform Keywords
1 Given a string s and an integer n, return a string in which each of the characters in s is repeated n times. Code Completion Given a string s and an integer n, return a string in which each of the characters in s is... CodeCheck Strings, Other String Operations
2 Given a string s, return the first vowel that is doubled in the string. Code Completion Given a string s, return the first vowel that is doubled in the string. CodeCheck Strings, Other String Operations
3 Given a string s, return the string with adjacent duplicates removed. Code Completion Given a string s, return the string with adjacent duplicates removed. For example, Mississippi yields Misisipi. CodeCheck Strings, Other String Operations
4 Given a string s and a string t, return a string in which all the characters of s that occur in t have been replaced by a _ character. Code Completion Given a string s and a string t, return a string in which all the characters of s that occur... CodeCheck Strings, Other String Operations
5 Given a string, return a string composed first of all characters at even positions and then of all characters at odd positions. Code Completion Given a string, return a string composed first of all characters at even positions and then of all characters at... CodeCheck Strings, Other String Operations
6 Write a method that undoes the effect of the preceding exercise. Code Completion Write a method that undoes the effect of the preceding exercise. CodeCheck Strings, Other String Operations
7 Given a string and two characters x and y (as strings of length 1), interchange all occurrences of x and y. Code Completion Given a string and two characters x and y (as strings of length 1), interchange all occurrences of x and... CodeCheck Strings, Other String Operations
8 Given a string s and a character c (as string of length 1), return a string with the characters surrounding the first occurrence of c reversed. Code Completion Given a string s and a character c (as string of length 1), return a string with the characters surrounding... CodeCheck Strings, Other String Operations
9 Given a string s and a character c (as string of length 1), return a string with the characters surrounding any occurrence of c reversed. Code Completion Given a string s and a character c (as string of length 1), return a string with the characters surrounding... CodeCheck Strings, Other String Operations