The Auditor - Amazon Top Interview Questions


Problem Statement :


Spreadsheets often use this alphabetical encoding for its columns: "A", "B", "C", ..., "AA", "AB", "AC", ..., "ZZ", "AAA", "AAB", "AAC", ....

Given a string s representing an alphabetical column id, return its column number. For example, given "A", return 1. Given "AA", return 27.

Example 1

Input

s = "AA"

Output

27


Solution :



title-img 




                        Solution in C++ :

int solve(string s) {
    int ans = 0, n = s.size();
    for (int i = 0; i < n; i++) {
        ans = ans * 26 + (s[i] - 'A' + 1);
    }
    return ans;
}
                    


                        Solution in Java :

import java.util.*;

class Solution {
    public int solve(String s) {
        int res = 0;
        for (int i = 0; i < s.length(); i++) {
            char ch = s.charAt(i);

            res = res * 26 + ch - 'A' + 1;
        }

        return res;
    }
}
                    


                        Solution in Python : 
                            
class Solution:
    def solve(self, s):
        tot, power = 0, 1
        for i in reversed(s):
            tot += power * (ord(i) - 64)
            power *= 26
        return tot


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