Algorithm Analysis

In the variable flag, we will count the number of conditions met. Initially, we set flag = 0.

• If the number n is even, then we increase flag by 1;

• If the number n is negative and divisible by three, then we increase flag by 1;

If flag = 1, then exactly one condition is met, we print YES. Otherwise, we print NO.

Example

Let n = 22. The number is even. The number is not negative and divisible by 3. Only one condition is met.

Algorithm Implementation

Read the input number n.

scanf("%d", &n);

Check the two conditions. If a condition is met, then we increase flag by 1.

flag = 0;
if (n % 2 == 0) flag++;
if (n < 0 && n % 3 == 0) flag++;

Depending on the value of the variable flag, we print the corresponding answer.

if (flag == 1) puts("YES");
else puts("NO");