摘要：
We are given non-negative integers nums[i] which are written on a chalkboard. Alice and Bob take turns erasing exactly one number from the chalkboard, 阅读全文
摘要：
There are two types of soup: type A and type B. Initially we have N ml of each type of soup. There are four kinds of operations: When we serve some so 阅读全文
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Sometimes people repeat letters to represent extra feeling, such as "hello" -> "heeellooo", "hi" -> "hiiii". Here, we have groups, of adjacent letters 阅读全文
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A website domain like "discuss.leetcode.com" consists of various subdomains. At the top level, we have "com", at the next level, we have "leetcode.com 阅读全文