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Prompt: You are given a string s and an integer k. You can choose any character of the string and change it to any other uppercase English character. You can perform this operation at most k times. [Read More]

Prompt: Given a string s and an integer k, return the length of the longest substring of s such that the frequency of each character in this substring is greater than or equal to k. [Read More]

Prompt: You are given two strings s and t of the same length. You want to change s to t. Changing the i-th character of s to i-th character of t costs abs(s[i] - t[i]) that is, the absolute difference between the ASCII values of the characters. [Read More]

Prompt: Implement pow(x, n), which calculates x raised to the power n (i.e., xn). [Read More]

Prompt: There is an integer array nums sorted in ascending order (with distinct values). [Read More]