Character Placement Strategy

Original String: "aab"

Step 1: Calculate Character Frequency

Character Frequency
a 2
b 1
We start by counting how many times each character appears in the string "aab". Character 'a' appears twice and character 'b' appears once.

Step 2: Sort by Frequency

Character Frequency
a 2
b 1
We arrange the characters in decreasing order of frequency. Since 'a' has a higher frequency (2) than 'b' (1), we'll place 'a' first.

Step 3: Place Most Frequent Character First

a
We start by placing the most frequent character ('a') in the first position. We still have one more 'a' and one 'b' to place.

Step 4: Place Next Character

a
b
To avoid placing the same character adjacent to each other, we place the next available character ('b') in the second position.

Step 5: Complete the Arrangement

a
b
a
Finally, we place the remaining 'a' in the third position. This gives us the string "aba" where no two identical characters are adjacent.

Final Result

Original: "aab"
Rearranged: "aba"
We have successfully rearranged the original string "aab" to "aba" using the character placement strategy. Notice that in the final string, no two identical characters are adjacent to each other.