# 744.Find Smallest Letter Greater Than Target

744. Find Smallest Letter Greater Than Target

Given a list of sorted characters letters containing only lowercase letters, and given a target letter target, find the smallest element in the list that is larger than the given target.
Letters also wrap around. For example, if the target is target = 'z' and letters = ['a', 'b'], the answer is 'a'.
Examples:
Input:
letters = ["c", "f", "j"]
target = "a"
Output: "c"
Input:
letters = ["c", "f", "j"]
target = "c"
Output: "f"
Input:
letters = ["c", "f", "j"]
target = "d"
Output: "f"
Input:
letters = ["c", "f", "j"]
target = "g"
Output: "j"
Input:
letters = ["c", "f", "j"]
target = "j"
Output: "c"
Input:
letters = ["c", "f", "j"]
target = "k"
Output: "c"
Note:
letters has a length in range [2, 10000].
letters consists of lowercase letters, and contains at least 2 unique letters.
target is a lowercase letter.

class Solution {
public:
char nextGreatestLetter(vector<char>& letters, char target) {
char res='z'+1;
for(auto c:letters)
if(c>target )
res=min(res,c);
return res=='z'+1?nextGreatestLetter(letters, target-26): res ;
}
};

class Solution {
public:
char nextGreatestLetter(vector<char>& letters, char target) {
char res='z'+1;
char minC=res;
for(auto c:letters)
{
if(c>target )
res=min(res,c);
minC=min(minC,c);
}
return res=='z'+1?minC: res ;
}
};