## Repetitive K-Sums

Alice thinks of a non-decreasing sequence of non-negative integers and wants Bob to guess it by providing him the set of all its K-sums with repetitions. What is this? Let the sequence be {A[1], A[2], ..., A[N]} and K be some positive integer that both Alice and Bob know. Alice gives Bob the set of all possible values that can be genereated by this - A[i1] + A[i2] + ... + A[iK], where 1 ≤ i1 ≤ i2 ≤ ... ≤ iK ≤ N. She can provide the values generated in any order she wishes to. Bob's task is to

View Solution →## Minimum Absolute Difference in an Array

The absolute difference is the positive difference between two values a and b, is written | a - b | or | b - a | and they are equal. If a = 3 and b = 20, | 3 - 2 | = | 2 - 3 | = 1 . Given an array of integers, find the minimum absolute difference between any two elements in the array. Function Description Complete the minimumAbsoluteDifference function in the editor below. It should return an integer that represents the minimum absolute difference between any pair of elements. mini

View Solution →## Marc's Cakewalk

Marc loves cupcakes, but he also likes to stay fit. Each cupcake has a calorie count, and Marc can walk a distance to expend those calories. If Marc has eaten cupcakes so far, after eating a cupcake with calories he must walk at least miles to maintain his weight. consumption. In this case, our minimum miles is calculated as . Given the individual calorie counts for each of the cupcakes, determine the minimum number of miles Marc must walk to maintain his weight. Note that he can ea

View Solution →## Grid Challenge

Given a square grid of characters in the range ascii[a-z], rearrange elements of each row alphabetically, ascending. Determine if the columns are also in ascending alphabetical order, top to bottom. Return YES if they are or NO if they are not. Example The grid is illustrated below. a b c a d e e f g The rows are already in alphabetical order. The columns a a e, b d f and c e g are also in alphabetical order, so the answer would be YES. Only elements within the same row can be rear

View Solution →## Luck Balance

Lena is preparing for an important coding competition that is preceded by a number of sequential preliminary contests. Initially, her luck balance is 0. She believes in "saving luck", and wants to check her theory. Each contest is described by two integers, L[ i ] and T[ i ]: L[ i ] is the amount of luck associated with a contest. If Lena wins the contest, her luck balance will decrease by ; if she loses it, her luck balance will increase by L[ i ]. T[ i ] denotes the contest's importance ra

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