发简信
IP属地：北京
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301 remove invalid parenthesis
**BFS: ** remove i parenthesis and add to queue, when one is valid then no need to rem...
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298 longest consecutive Sequence in binary tree
Math.max(current count, Math.max(leftSubtree, rightSubtree))current count = last count ...
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153 find minimum in rotated array
key: this is asking the first element smaller than target = nums[last]
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3 longest substring without repeating characters
1. sliding window: longest = end - start + 1; cases need to cover: "abcabcabcdd" contai...
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从自己已经拥有的去寻找快乐
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