#include <iostream>
#include <vector>
char findSmallestLetterGreaterThanTarget(const std::vector<char>& letters, char given_letter) {
int left = 0, right = letters.size() - 1;
char result = letters[0]; // Default to the first letter
while (left <= right) {
int mid = left + (right - left) / 2;
if (letters[mid] > given_letter) {
result = letters[mid];
right = mid - 1; // Narrow down to the left half
} else {
left = mid + 1; // Narrow down to the right half
}
}
return result;
}
int main() {
std::vector<char> letters = {'c', 'e', 'k', 'm'};
char given_letter = 'd';
char result = findSmallestLetterGreaterThanTarget(letters, given_letter);
std::cout << "The smallest letter greater than '" << given_letter << "' is: " << result << "\n";
}
/*
run:
The smallest letter greater than 'd' is: e
*/
