2278. Percentage of Letter in String

problem

solution

class Solution {
public:
    int percentageLetter(string s, char letter) {
        int count=0;
        for(char &c:s) count+=(c==letter);
        int ret=count*100/s.size();
        return ret;
        
    }
};

analysis

• time complexity O(n)
• space complexity O(1)