Find the rank of a number in the lexicographic order of its permutations For example: 312 has rank 5 in the sorted permutation list {123, 132, 213, 231, 312, 321}. A brute force method would be to generate all the permutation and sort them. This will be in exponential order as to generate all the […]
Tag Archives: permutation
Permutation Permutation means arranging all the members of a set into some sequence or order, or if the set is already ordered, rearranging (reordering) its elements, a process called permuting. These differ from combinations, which are selections of some members of a set where order is disregarded. For example, written as tuples, there are six […]
Given a number N. Find the smallest even number greater than N such that the digits are a permutation of the number N. A trivial solution to start with would be to generate all the permutations of digits of the given number and then sort all the permutations. The first even permutation in the sorted […]