Algorithms

C++ Bucket Sort

What is Bucket sort? How to implement in C++? You have plenty of assorted DoB (Date of Birth) slips, you need to sort them. One way is to go through the list and place each of the slip in a month-wise column. Then re-arrange inside the month column, the slips using some simple sort method. …

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C++ Counting Sort

What is counting sort? How to implement in C++? Counting sort works when the input is known to be withing a range. Create an array of size of input range. Go through each of the numbers in the input and increment the appropriate array value (input number is mapped as the index to array). Now …

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C++ Selection Sort

What is selection sort? How to implement in C++? Selection sort is like: you have face up cards and you can see all at a time. First pick up the maximum numbered card, and then choose the next best maximum number and keeping them in hand in order. Continue till all the cards exhausted. So …

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C++ Insertion Sort

What is insertion sort? How to implement in C++? Insertion sort similar to card ordering in your hand as you pick the cards one by one from the lot. The idea of the sort is to go through numbers from the beginning towards end one by one. At each time, check the number in question …

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C++ Radix Sort

What is Radix sort? How to implement Radix Sort in C++? Radix sort orders the contents position by position. For ease of understanding here we restrict for numbers, but it should work with floats, strings, etc. It is a non-comparitive sort unlike many others which need comparison. The idea is: position by position, either starting …

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C++ Quick Select

What is Quick Select Algorithm? How to implement in C++? The QuickSelect algorithm quickly finds the k-th smallest element of an unsorted array of n elements. It is an O(n), worst-case linear time, selection algorithm. A typical selection by sorting method would need atleast O(n log n) time. This algorithm is identical to quick sort …

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C++ Merge Sort

What is Merge Sort algorithm? How to implement Merge Sort in C++? Merge Sort  is a divide and conquer algorithm. In the best/ average/ worst case it gives a time complexity of O(n log n). Conceptually, a merge sort works as follows: If the list is of length 0 or 1, then it is already sorted. …

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C++ Quick Sort

What is Quick Sort algorithm? How to implement Quick Sort in C++? Quick Sort is a sorting algorithm. It is also referred as partition exchange sort. In the best/ average case it gives a time complexity of O(nlogn) and worst case time complexity of O(n*n). Can be implemented as in-place sorting without need for additional …

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C++ Bubble Sort

What is bubble sort algorithm? How to implement in C++? Bubble sort is a simple sorting algorithm. Best case time complexity is O(n) when the list is already sorted. Average and Worst case complexity is O(n*n). So it is not recommended for large input sets. Bubble sort involves these simple steps. Compare adjacent items and …

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