In this HackerRank Small Triangles, Large Triangles in C programming problem, we need to make a c program in which we have given n triangles, specifically, their sides a, b, and c. 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.

## HackerRank Small Triangles, Large Triangles in the C problem solution

``` #include <stdio.h>
#include <stdlib.h>

struct Triangle
{
int a, b, c;
};

int square(struct Triangle t)
{
int a = t.a, b = t.b, c = t.c;
return (a + b + c)*(a + b - c)*(a - b + c)*(-a + b + c);
}

void sort_by_square(struct Triangle* a, int n)
{
for (int i = 0; i < n; i++)
for (int j = i + 1; j < n; j++)
if (square(a[i]) > square(a[j]))
{
struct Triangle temp = a[i];
a[i] = a[j];
a[j] = temp;
}
}

int main()
{
int n;
scanf("%d", &n);
struct Triangle *a = calloc(n, sizeof(struct Triangle));
for (int i = 0; i < n; i++)
scanf("%d%d%d", &a[i].a, &a[i].b, &a[i].c);
sort_by_square(a, n);
for (int i = 0; i < n; i++)
printf("%d %d %d\n", a[i].a, a[i].b, a[i].c);
return 0;
}
```