### Problems by Sherlock221b

 Alice and the ChessboardIt's Sunday afternoon, and Alice is in her room trying to figure out the rules of the game called Ch... Moderate 381/413/722 Alice vs. BobWe have found an Idea to end the everlasting rivalry between Alice and Bob. We will give them a list... Moderate 12/23/65 An Act of Uniformly Random KindnessAfter selling all the bitcoins that you bought back in 2010, you now find yourself with a huge amoun... Moderate 13/13/22 Combination LockImagine a Combination Lock - If you set the numbers to a preset combination (passcode), the lock wi... Moderate 98/103/162 Diagonal SumGiven an N×N size matrix, you have to re-arrange the elements of the matrix in such a way that the d... Very Easy 108/124/288 Find PrimeA prime number is a positive integer that is divisible only by itself and 1. The first few prime num... Very Easy 394/405/595 Harry Potter and the Vault of Gringotts"There was a break-in of Gringotts Wizarding Bank on 1 May, 1998, during the height of the Second Wi... Moderate 9/21/37 K-th DuoPalindromeAlice likes playing with Palindromes (strings that read the same backward as forward, such as 'madam... Moderate 3/6/28 Meena and Random ChoiceMeena has an array of length N (1-indexed). The numbers of the array are arranged from left to right... Moderate 6/6/8 Mischievous Meme MakerMemes are love, memes are life. Living in 2018, we are all very familiar with internet memes. They a... Moderate 76/96/154 Smallest IntervalAlice has a collection of N numbers. She would like to place them on a number line. She places each ... Moderate 59/70/151 The Game Is Back OnMoriarty is bored again. When he gets bored, the only thing he wants to do is play with Sherlock. So... Moderate 26/46/210 XOR and the ArrayGiven an array of N integers, you need to find out the minimum number of integers that must be added... Moderate 74/89/225