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Path Sum. Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. For example: Given the below binary tree and sum = 22, 5 / \ 4 8 / / \ 11 13 4 / \ \ 7 2 1

In LeetCode, there are a set of problems to find the sum of several integers from an array to be a Given an array S of n integers, find three integers in S such that the sum is closest to a given number...

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LeetCode解题报告 ... Range Sum Query - Immutable. ... Find First and Last Position of Element in Sorted Array. 300. Longest Increasing Subsequence. 48. Rotate Image.

Sort all pairs by first element. For every pair, do binary search for second element in the given array, i.e., check if second element of this pair exists as first element in array. If found, then compare first element of pair with second element. Time Complexity of this solution is O(nLogn).

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LeetCode – Product of Array Except Self – 30Days Challenge LeetCode – Longest Common Subsequence – 30Days Challenge LeetCode – Minimum Path Sum – 30Days Challenge

Solution of LeetCode Problems