_717.java

package com.fishercoder.solutions;

/**
 * 717. 1-bit and 2-bit Characters
 *
 * We have two special characters. The first character can be represented by one bit 0. The second character can be represented by two bits (10 or 11).
 * Now given a string represented by several bits. Return whether the last character must be a one-bit character or not. The given string will always end with a zero.

 Example 1:
 Input:
 bits = [1, 0, 0]
 Output: True
 Explanation:
 The only way to decode it is two-bit character and one-bit character. So the last character is one-bit character.

 Example 2:
 Input:
 bits = [1, 1, 1, 0]
 Output: False
 Explanation:
 The only way to decode it is two-bit character and two-bit character. So the last character is NOT one-bit character.

 Note:
 1 <= len(bits) <= 1000.
 bits[i] is always 0 or 1.
 */
public class _717 {
    public static class Solution1 {
        public boolean isOneBitCharacter(int[] bits) {
            int n = bits.length;
            int i = 0;
            while (i < n - 1) {
                if (bits[i] == 0) {
                    i++;
                } else {
                    i += 2;
                }
            }
            return i == n - 1 ? true : false;
        }
    }
}