Leetcode: Generalized Abbreviation
这道题肯定是DFS/Backtracking, 但是怎么DFS不好想，跟Leetcode: Remove Invalid Parentheses的backtracking很像。 Gen ...
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Leetcode: Count of Range Sum
参考：https://leetcode.com/discuss/79083/share-my-solution First of all, let's look at the naiv ...