Difficulty: Medium

Count the Number of Set Bits for Every Number from 0 to n

Given a number n, count the number of 1's in the binary representation of each number from 0 to n.

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Print Matrix in Spiral Order

Given a matrix, print all elements in spiral order.

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Find Combinations of a List Whose Sum is Equal to a Target

Given a list of distinct integers, find all the possible combinations which sums up to a target.

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Generate Spiral Matrix

Given a positive integer n, generate a square matrix filled with elements from 1 to n^2 in spiral order.

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Minimum Remove to Make Valid Parentheses

Given a string, remove minimum number of parentheses to make it balanced.

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Second Largest Node in Binary Search Tree

Given the root to a binary search tree, find the second largest node in the tree.

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Top k Frequent Words

How to use a Custom Comparator in C++ Priority Queue and Solving Top k Frequent Words

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