Suppose you are given two strings s and t. String t is generated by random shuffling string s and then adding one more letter at a random position. Return, the letter that was added to t.
Example 1: Input: s = “abcd”, t = “ceadb-
Output: “e” Explanation: “cadb” was produced by random shuffling “abcd” and “e” was added in as the second letter.
Example 2: Input: s = “abbdd”, t = “dabadb” Output: “a”
Example3: Input: s = “”, t = “y” Output: “y” Example4: Input: s = “aaaa”, t = “aabaa-Output: “b”:
Example 5: Input: s = “ae”, t = “aae” Output: “a” using C#
Here’s a possible C# implementation of the function:
csharpCopy codepublic static char FindAddedLetter(string s, string t)
{
int[] letterCounts = new int[26];
foreach (char c in s)
{
letterCounts[c - 'a']++;
}
foreach (char c in t)
{
letterCounts[c - 'a']--;
}
for (int i = 0; i < 26; i++)
{
if (letterCounts[i] < 0)
{
return (char)('a' + i);
}
}
return '\0'; // no letter was added
}
The function takes in two parameters s and t, representing the original string and the shuffled string with one added letter. It first initializes an array letterCounts to keep track of the count of each letter in s. It iterates over each character in s, incrementing the count of the corresponding letter in the letterCounts array.
The function then iterates over each character in t, decrementing the count of the corresponding letter in the letterCounts array. The letter that was added to t will have a count of -1 in the letterCounts array.
Finally, the function iterates over the letterCounts array and returns the letter that was added to t. If no letter was added, the function returns the null character ‘\0’.
You can call this function like this:
javaCopy codestring s = "abcd";
string t = "ceadb";
char addedLetter = FindAddedLetter(s, t);
Console.WriteLine(addedLetter);
This will output e, which is the expected result for the given input.
