Sage-Tips

How do you find a triplet in an array?

Triplets can be found using the hashing technique.

1. Traverse the array from i = 0 to n – 2.
2. Create an empty hash table.
3. Traverse from j = i+ 1 to n -1.
4. sum = arr[i] + arr[j]
5. if (-sum) is present in the hash table,
6. then print arr[i], arr[j] and -sum as triplets.
7. else, insert arr[j] in the hash table and proceed.

How do I find a number in a sorted array?

Given a sorted array of integer numbers, write a function which returns zero-based position on which the specified value is located. Function should return negative value if requested number cannot be found in the array. If value occurs more than once, function should return position of the first occurrence.

How do you find the max 3 elements in an array?

a) Let current array element be x. b) If (x > first) { // This order of assignment is important third = second second = first first = x } c) Else if (x > second) { third = second second = x } d) Else if (x > third) { third = x } 3) Print first, second and third. Below is the implementation of the above algorithm.

How do you find all pairs of elements in an array whose sum is equal to given number?

How to find all pairs of elements in Java array whose sum is equal to a given number?

1. Add each element in the array to all the remaining elements (except itself).
2. Verify if the sum is equal to the required number.
3. If true, print their indices.

How do you find a triplet?

How to Form a Pythagorean Triplet

1. If the number is odd: Square the number N and then divide it by 2. Take the integer that is immediately before and after that number i.e. (N2/2 -0.5) and (N2/2 +0.5).
2. If the number is even: Take the half of that number N and then square it. Pythagorean triplet= N, (N/2)2-1, (N/2)2+1.

How do you solve a 3 sum problem?

A basic, O(n3), solution to 3sum (ignoring the, ‘don’t output duplicates’ constraint), is to simply iterate through each possible combination of 3 numbers from the array and then test if they add to 0. To do this, we can just use three for loops.

How do I find the elements in a sorted list?

Approach:

1. The idea is to find the pivot point, divide the array in two sub-arrays and perform binary search.
2. The main idea for finding pivot is – for a sorted (in increasing order) and pivoted array, pivot element is the only element for which next element to it is smaller than it.

Which of the following method is designed to find an element in a sorted list?

The sort () method is used to sort the objects of a list.

How do you find the first and second largest numbers in an array?

1. Declare an array of user-defined size.
2. Using for loop, define the elements of the array.
3. Consider the first element of array to be the first largest number (store it in a variable, largest1).
4. Consider the second element of array to be the second-largest number (store it in a variable, largest2).

How do you count the number of pairs in an array?

Count pairs in an array that hold i+j= arr[i]+arr[j]

1. Examples:
2. Naive Approach: Run two nested loops and check every possible pair for the condition where i + j = arr[i] + arr[j]. If the condition is satisfied, then update the count = count + 1. Print the count at the end.
3. Efficient Approach:

How to find all pairs with sum in a sorted array?

Pair with given sum in a sorted array. You are given an array Arr of size N. You need to find all pairs in the array that sum to a number K. If no such pair exists then output will be -1. The elements of the array are distinct and are in sorted order. Note: (a,b) and (b,a) are considered same.

How to find all pairs of elements in Java array?

To find all pairs of elements in Java array whose sum is equal to a given number − Add each element in the array to all the remaining elements (except itself). Verify if the sum is equal to the required number.

What is the algorithm for sorting an array?

Algorithm: 1 Sort the array in ascending order. 2 Traverse the array from start to end. 3 For every index i, create two variables l = i + 1 and r = n – 1 4 Run a loop until l is less than r if the sum of array [l], array [r] is equal to zero then print the triplet and break the loop

How do you sort an array of objects in C?

Sort the array A [] then walk two pointers inward from the ends of the array, at each point looking at their sum. If it is exactly k, then we are done. If it exceeds k, then any sum using the larger element is too large, so we walk that pointer inwards.