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Evaluate Division You are given an array of variable pairs equations and an array of real numbers values , where equations[i] = [Ai, Bi] and values[i] 阅读全文
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Count Unique Characters of All Substrings of a Given String Let's define a function countUniqueChars(s) that returns the number of unique characters o 阅读全文
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Meeting Rooms III You are given an integer $n$. There are $n$ rooms numbered from $0$ to $n - 1$. You are given a 2D integer array meetings where meet 阅读全文
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Number of Ways to Reach a Position After Exactly k Steps You are given two positive integers startPos and endPos . Initially, you are standing at posi 阅读全文
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Maximum Number of Robots Within Budget You have $n$ robots. You are given two 0-indexed integer arrays, chargeTimes and runningCosts , both of length 阅读全文