counting elements

A collection of 4 post

Perm Check

Problem A non-empty array A consisting of N integers is given. A permutation is a sequence containing each element from 1 to N once, and only once. For example, array A such that: is a permutation, but array A such that: is not a permutation, because value 2 is missing. The goal is to check whether…

Missing Integer

Problem This is a demo task. Write a function: that, given an array A of N integers, returns the smallest positive integer (greater than 0) that does not occur in A. For example, given A = 1, 3, 6, 4, 1, 2, the function should return 5. Given A = 1, 2, 3, the function should return 4. Given A = −…

Max Counters

Problem You are given N counters, initially set to 0, and you have two possible operations on them: increase(X) − counter X is increased by 1, max counter − all counters are set to the maximum value of any counter. A non-empty array A of M integers is given. This array represents consecutive…

Frog River One

Problem A small frog wants to get to the other side of a river. The frog is initially located on one bank of the river (position 0) and wants to get to the opposite bank (position X+1). Leaves fall from a tree onto the surface of the river. You are given an array A consisting of N integers…