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Convert a sentence into its equivalent mobile numeric keypad sequence

Tags : string, geeksforgeeks, cpp, easy

Problem Statement - link #

Given a sentence in the form of a string in uppercase, convert it into its equivalent mobile numeric keypad sequence.

Your Task: You dont need to read input or print anything. Complete the function printSequence() which takes a string as input parameter and returns its equivalent mobile numeric keypad sequence as a string. NOTE : Characters of string can be empty space or capital alphabets.

Expected Time Complexity: O(N) Expected Auxiliary Space: O(N)

Examples #

Example 1:

Input:
S = "GFG"
Output: 43334
Explanation: For 'G' press '4' one time.
For 'F' press '3' three times.

Example 2:

Input:
S = "HEY U"
Output: 4433999088
Explanation: For 'H' press '4' two times.
​For 'E' press '3' two times. For 'Y' press '9' 
three times. For white space press '0' one time.
For 'U' press '8' two times.

Constraints #

Solutions #

class Solution{
    public:
    string printSequence(string S)
    {
        //code here.
        string s[26] = {
            "2","22","222","3","33","333","4","44","444","5","55","555","6","66","666","7","77","777","7777","8","88","888","9","99","999","9999"};
        string res="";
        for(char c: S)
            if(c==' ') res+='0';
            else res += s[c-'A'];
        return res;
    }
};