Leet-Code-Problems/keyboard-row.cpp at main · Qazalbash/Leet-Code-Problems · GitHub

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// https://leetcode.com/problems/keyboard-row

class Solution {
public:
const map<char, int> key = {
    { 'q', 1 },
    { 'w', 1 },
    { 'e', 1 },
    { 'r', 1 },
    { 't', 1 },
    { 'y', 1 },
    { 'u', 1 },
    { 'i', 1 },
    { 'o', 1 },
    { 'p', 1 },
    { 'a', 2 },
    { 's', 2 },
    { 'd', 2 },
    { 'f', 2 },
    { 'g', 2 },
    { 'h', 2 },
    { 'j', 2 },
    { 'k', 2 },
    { 'l', 2 },
    { 'z', 3 },
    { 'x', 3 },
    { 'c', 3 },
    { 'v', 3 },
    { 'b', 3 },
    { 'n', 3 },
    { 'm', 3 },
    { 'Q', 1 },
    { 'W', 1 },
    { 'E', 1 },
    { 'R', 1 },
    { 'T', 1 },
    { 'Y', 1 },
    { 'U', 1 },
    { 'I', 1 },
    { 'O', 1 },
    { 'P', 1 },
    { 'A', 2 },
    { 'S', 2 },
    { 'D', 2 },
    { 'F', 2 },
    { 'G', 2 },
    { 'H', 2 },
    { 'J', 2 },
    { 'K', 2 },
    { 'L', 2 },
    { 'Z', 3 },
    { 'X', 3 },
    { 'C', 3 },
    { 'V', 3 },
    { 'B', 3 },
    { 'N', 3 },
    { 'M', 3 }
};
    vector<string> findWords(vector<string>& words) {
        vector<string> w;
        for(const string& word: words) {
            const int line = key.at(word[0]), size = word.size();
            int i = 1;
            while(i < size && key.at(word[i]) == line) ++i;
            if (i == size) w.push_back(word);
        }
        return w;
    }
};