LeetCode 2231. Largest Number After Digit Swaps by Parity

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LeetCode 1046. Last Stone Weight

Do as the game. Choose two heaviest stone and do the subtraction.

LeetCode 2099. Find Subsequence of Length K With the Largest Sum

Use priority queue to find the largest k numbers. also and their index.

LeetCode 703. Kth Largest Element in a Stream

Maintain a Heap that contains only the K biggest the element.

LeetCode 506. Relative Ranks

First we need to sort the scores from biggest to smallest.

Friends Season1: 04 Words&Expressions