Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Triplet with desired sum in JavaScript
We are required to write a JavaScript function that takes in an array of numbers as the first argument and a number as the second argument. The function should prepare and return an array of all such triplets (consecutive or nonconsecutive), that add up to the number specified by the second argument.
For example −
If the input array and the number are −
const arr = [4, 2, 0, 1, 2, 6, 8, 3, 2, 5]; const num = 8;
Then the output array should be −
const output = [ [ 2, 2, 4 ], [ 1, 3, 4 ], [ 0, 2, 6 ], [ 1, 2, 5 ] ];
Example
Following is the code −
const arr = [4, 2, 0, 1, 2, 6, 8, 3, 2, 5];
const num = 8;
const tripletSum = (arr, num) => {
if (arr.length === 3) {
if (arr[0]+arr[1]+arr[2] === 0) {
return [[arr[0],arr[1],arr[2]]];
};
};
const results = [];
const hashMap = {};
for (var i=0; i<arr.length; i++) {
for (var j=i+1; j<arr.length; j++) {
for (var k=j+1; k<arr.length; k++) {
if (arr[i]+arr[j]+arr[k] === num) {
if (!hashMap[arr[i]*arr[j]*arr[k]]) {
results.push([arr[i],arr[j],arr[k]]);
results[results.length-1].sort();
hashMap[arr[i]*arr[j]*arr[k]] = true;
}
}
}
}
}
return results;
};
console.log(tripletSum(arr, num));Output
Following is the console output −
[ [ 2, 2, 4 ], [ 1, 3, 4 ], [ 0, 2, 6 ], [ 1, 2, 5 ] ]
Updated on: 19-Jan-2021
231 Views
Advertisements