<Codesignal> isLucky

Easy

Ticket numbers usually consist of an even number of digits. A ticket number is considered lucky if the sum of the first half of the digits is equal to the sum of the second half.

Given a ticket number n, determine if it's lucky or not.

Example

• For n = 1230, the output should be
  isLucky(n) = true;
• For n = 239017, the output should be
  isLucky(n) = false.

Input/Output

• [execution time limit] 0.5 seconds (c)

• [input] integer n

  A ticket number represented as a positive integer with an even number of digits.

  Guaranteed constraints:
  10 ≤ n < 10^6.

• [output] boolean

  • true if n is a lucky ticket number, false otherwise.

[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

bool isLucky(int n)
{
	int front=0, back=0;
	char number[8]={'\0', };

	sprintf(number,"%d", n);

	for(int i=0;i<strlen(number)/2;i++)
	{
		front+=number[i]-'0';
		back+=number[strlen(number)-1-i]-'0';
	}

	return front==back;
}