<Codesignal> Magical Well

Easy

You are standing at a magical well. It has two positive integers written on it: a and b. Each time you cast a magic marble into the well, it gives you a * b dollars and then both a and b increase by 1. You have n magic marbles. How much money will you make?

Example

For a = 1, b = 2, and n = 2, the output should be
magicalWell(a, b, n) = 8.

You will cast your first marble and get $2, after which the numbers will become 2 and 3. When you cast your second marble, the well will give you $6. Overall, you'll make $8. So, the output is 8.

Input/Output

• [execution time limit] 0.5 seconds (c)

• [input] integer a

  Guaranteed constraints:
  1 ≤ a ≤ 2000.

• [input] integer b

  Guaranteed constraints:
  1 ≤ b ≤ 2000.

• [input] integer n

  The number of magic marbles in your possession, a non-negative integer.

  Guaranteed constraints:
  0 ≤ n ≤ 5.

• [output] integer

[C] Syntax Tips

// Prints help message to the console
// Returns a string
char * helloWorld(char * name) {
    char * answer = malloc(strlen(name) + 8);
    printf("This prints to the console when you Run Tests");
    strcpy(answer, "Hello, ");
    strcat(answer, name);
    return answer;
}

---

Solution

int magicalWell(int a,int b,int n)
{
	int money=0;

	for(int i=0;i<n;i++,a++,b++)
		money+=a*b;

	return money;
}