Small Triangles, Large Triangles in C HackerRank Solution

Hello Programmers, In this post, you will know how to solve the Small Triangles, Large Triangles in C HackerRank Solution. This problem is a part of the HackerRank C Programming Series.

Small Triangles, Large Triangles in C HackerRank Solution
Small Triangles, Large Triangles in C HackerRank Solution

One more thing to add, don’t directly look for the solutions, first try to solve the problems of Hackerrank by yourself. If you find any difficulty after trying several times, then you can look for solutions.

Small Triangles, Large Triangles in C

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You are given n, triangles, specifically, their sides ai, bi and ci. Print them in the same style but sorted by their areas from the smallest one to the largest one. It is guaranteed that all the areas are different. The best way to calculate a volume of the triangle with sides a, b and c is Heron’s formula:
s = √(P * (P – a) * (P – b) * (P – c)) where P = (a+b+c)/2.

Input Format 

First line of each test file contains a single integer n.n lines follow with ai, bi and con each separated by single spaces.

Constraints

  • 1<=n<=100
  • 1<= ai, bi, ci <=70
  • ai + bi > ci, ai + ci > bi and bi+ci > ai

Output Format

Print exactly n lines. On each line print 3 integers separated by single spaces, which are ai, bi and cof the corresponding triangle.

Sample Input :-

3
7 24 25
5 12 13
3 4 5

Sample Output :-

3 4 5
5 12 13
7 24 25

Explanation

The square of the first triangle is 84. The square of the second triangle is 30.The square of the third triangle is 6. So the sorted order is the reverse one.

Small Triangles, Large Triangles in C HackerRank Solution

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
struct triangle
{
 int a;
 int b;
 int c;
};
typedef struct triangle triangle;
void sort_by_area(triangle* tr, int n)
{
  int *p=malloc(n*sizeof(float));
//create array of size n to store "volumes"
    for(int i=0;i<n;i++)
    {
 float a=(tr[i].a+tr[i].b+tr[i].c)/2.0;
//use 2.0 compulsary int/int gives int, int/float gives float
       p[i]=(a*(a-tr[i].a)*(a-tr[i].b)*(a-tr[i].c));
//formula without sqrt as areas are different guarenteed
//because sqrt dosent work well with float values
    }
//bubble sort
    for(int i=0;i<n;i++)
    {
        for(int j=0;j<n-i-1;j++)
        {
            if(p[j]>p[j+1])
            {
                int temp=p[j];
                p[j]=p[j+1];
                p[j+1]=temp;
//swapping array of areas in ascending
//and simuntaneously the structure contents
                temp=tr[j].a;
                tr[j].a=tr[j+1].a;
                tr[j+1].a=temp;
                temp=tr[j].b;
                tr[j].b=tr[j+1].b;
                tr[j+1].b=temp;
                temp=tr[j].c;
                tr[j].c=tr[j+1].c;
                tr[j+1].c=temp;
            }
        }
    }
}
int main()
{
 int n;
 scanf("%d", &n);
 triangle *tr = malloc(n * sizeof(triangle));
 for (int i = 0; i < n; i++) {
  scanf("%d%d%d", &tr[i].a, &tr[i].b, &tr[i].c);
 }
 sort_by_area(tr, n);
 for (int i = 0; i < n; i++)
 {
  printf("%d %d %d\n", tr[i].a, tr[i].b, tr[i].c);
 }
 return 0;
}

Disclaimer: The above Problem (Small Triangles, Large Triangles in C) is generated by Hackerrank but the Solution is Provided by BrokenProgrammers. This tutorial is only for Educational and Learning purposes.

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