## Multiply Strings

Given two non-negative integers num1 and num2 represented as strings, return the product of num1 and num2, also represented as a string. Note: You must not use any built-in BigInteger library or convert the inputs to integer directly.【The sadest things which I can found the fastest soultion in leetcode break this rule.】 https://leetcode.com/problems/multiply-strings/ Solut......

## Interval List Intersections

You are given two lists of closed intervals, firstList and secondList, where firstList[i] = [starti, endi] and secondList[j] = [startj, endj]. Each list of intervals is pairwise disjoint and in sorted order. Return the intersection of these two interval lists. A closed interval [a, b] (with a <= b) denotes the set of real numbers x with a <= x <= b. The inter......

## Merge Intervals

Given an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals, and return an array of the non-overlapping intervals that cover all the intervals in the input. https://leetcode.com/problems/merge-intervals/ Solution submit code class Solution: def merge(self, intervals: List[List[int]]) -> List[List[int]]: if len(intervals) =......

## Remove Covered Intervals

Given an array intervals where intervals[i] = [li, ri] represent the interval [li, ri), remove all intervals that are covered by another interval in the list. The interval [a, b) is covered by the interval [c, d) if and only if c <= a and b <= d. Return the number of remaining intervals. https://leetcode.com/problems/remove-covered-intervals/ Solution submit c......

## Stone Game

Description Alice and Bob play a game with piles of stones. There are an even number of piles arranged in a row, and each pile has a positive integer number of stones piles[i]. The objective of the game is to end with the most stones. The total number of stones across all the piles is odd, so there are no ties. Alice and Bob take turns, with Alice starting first. Each turn, a player t......

## Nim Game

You are playing the following Nim Game with your friend: Initially, there is a heap of stones on the table. You and your friend will alternate taking turns, and you go first. On each turn, the person whose turn it is will remove 1 to 3 stones from the heap. The one who removes the last stone is the winner. Given n, the number of stones in the heap, return true if you can win the game a......

## Count Primes

Given an integer n, return the number of prime numbers that are strictly less than n. https://leetcode.com/problems/count-primes/ Solution Code python class Solution: def countPrimes(self, n: int) -> int: if n <= 1: return 0 tmp = [True] * n for i in range(2, n): if(tmp[i]): for j in range(i*i, n, ......

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