Maximum Perimeter Triangle in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct]

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Introduction To Algorithm

The word Algorithm means “a process or set of rules to be followed in calculations or other problem-solving operations”. Therefore Algorithm refers to a set of rules/instructions that step-by-step define how a work is to be executed upon in order to get the expected results. 

Advantages of Algorithms:

• It is easy to understand.
• Algorithm is a step-wise representation of a solution to a given problem.
• In Algorithm the problem is broken down into smaller pieces or steps hence, it is easier for the programmer to convert it into an actual program.

Link for the Problem – Maximum Perimeter Triangle – Hacker Rank Solution

Maximum Perimeter Triangle – Hacker Rank Solution

Problem:

Given an array of stick lengths, use  of them to construct a non-degenerate triangle with the maximum possible perimeter. Return an array of the lengths of its sides as  integers in non-decreasing order.

If there are several valid triangles having the maximum perimeter:

1. Choose the one with the longest maximum side.
2. If more than one has that maximum, choose from them the one with the longest minimum side.
3. If more than one has that maximum as well, print any one them.

If no non-degenerate triangle exists, return .

Example

The triplet  will not form a triangle. Neither will  or , so the problem is reduced to  and . The longer perimeter is .

Function Description

Complete the maximumPerimeterTriangle function in the editor below.

maximumPerimeterTriangle has the following parameter(s):

• int sticks[n]: the lengths of sticks available

Returns

• int[3] or int[1]: the side lengths of the chosen triangle in non-decreasing order or -1

Input Format

The first line contains single integer , the size of array .
The second line contains  space-separated integers , each a stick length.

Constraints

Sample Input 0

5
1 1 1 3 3

Sample Output 0

1 3 3

Explanation 0

There are  possible unique triangles:

The second triangle has the largest perimeter, so we print its side lengths on a new line in non-decreasing order.

Sample Input 1

3
1 2 3

Sample Output 1

-1

Explanation 1

The triangle  is degenerate and thus can’t be constructed, so we print -1 on a new line.

Sample Input 2

6
1 1 1 2 3 5

Sample Output 2

1 1 1

Explanation 2

The triangle (1,1,1) is the only valid triangle.

Maximum Perimeter Triangle – Hacker Rank Solution

import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] sticks = new int[n];
        for(int i=0; i < n; i++){
            sticks[i] = in.nextInt();
        }
        Arrays.sort(sticks);
        int trianglePosition = n-3;
        while ((trianglePosition>=0) && (sticks[trianglePosition] + sticks[trianglePosition+1] <= sticks[trianglePosition+2])) {
            trianglePosition--;
        }
        if (trianglePosition < 0) {
            System.out.println(-1);
        } else {
            System.out.println(sticks[trianglePosition] + " " + sticks[trianglePosition + 1] + " " + sticks[trianglePosition + 2]);
        }
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    }
}