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题目 Given two strings s and t, return true if they are equal when both are typed into empty text editors. '#' means a backspace character. Note that af 阅读全文
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题目 Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j != k, and nums[i] + nums[j] + nums 阅读全文
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题目 Given the head of a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list. Return 阅读全文