Small Triangles, Large Triangles in c – Hacker Rank Solution | HackerRank Programming Solutions | HackerRank C Solutions

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C is one of the most widely used Programming Languages. it is basically used to build Operating System. C was developed by Dennis Ritchie in 1972. Below are some examples of C Programming which might you understanding the basics of C Programming.

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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.


  • 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 :-

7 24 25
5 12 13
3 4 5

Sample Output :-

3 4 5
5 12 13
7 24 25


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 – Hacker Rank 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
//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++)
                int temp=p[j];
//swapping array of areas in ascending
//and simuntaneously the structure contents

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;

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