Reverse Words in a Sentence
Reverse the order of words in a given sentence (an array of characters). %0 node_1 “Hello World” node_2 “World Hello” node_1->node_2
Runtime Complexity: Linear, O(n)O(n)O(n)
Memory Complexity: Constant, O(1)O(1)O(1)
The steps to solve this problem are simpler than they seem:
How many ways can you make change with coins and a total amount
Suppose we have coin denominations of [1, 2, 5] and the total amount is 7. We can make changes in the following 6 ways:
Runtime Complexity: Quadratic, O(m∗n)O(m*n)O(m∗n)
Memory Complexity: Linear, O(n)O(n)O(n)
To solve this problem, we’ll keep an array of size amount + 1. One additional space is reserved because we also want to store the solution for the 0 amount.
There is only one way you can make a change of 0, i.e., select no coin so we’ll initialize solution[0] = 1. We’ll solve the problem for each amount, denomination to amount, using coins up to a denomination, den.
The results of different denominations should be stored in the array solution. The solution for amount x using a denomination den will then be:
We’ll repeat this process for all the denominations, and at the last element of the solution array, we will have the solution.
Given a set of ‘n’ elements, find their Kth permutation. Consider the following set of elements: %0 node_1 1 node_2 2 node_3 3
All permutations of the above elements are (with ordering):
Here we need to find the Kth permutation.
Runtime Complexity: Linear, O(n)O(n)O(n)
Memory Complexity: Linear, O(n)O(n)O(n)
Here is the algorithm that we will follow:
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