Leetcode Excel Sheet Column Number problem solution

In this Leetcode Excel Sheet Column Number problem solution we have Given a string columnTitle that represents the column title as appears in an Excel sheet, return its corresponding column number.

Problem solution in Python.

class Solution(object):
    def titleToNumber(self, s):
        """
        :type s: str
        :rtype: int
        """
        s=S[::-1]
        return sum([(ord(s[i])-64)*(26**i) for i in range(len(s))])

Problem solution in Java.

class Solution {
    public int titleToNumber(String s) {
        int len= s.length()-1;
        int res=0;
        for(int i=0;i<s.length();i++)
            res+=Math.pow(26,len-i)*(s.charAt(i)-64);
        return res;
        
    }
}

Problem solution in C++.

class Solution {
public:
    int titleToNumber(string s) {
        int ans=0,i=0;
        while(i<s.length())
            ans= ans*26 + (s[i++]-'A'+1);
        return ans;
    }
};

Problem solution in C.

#include<string.h>
int titleToNumber(char * s){
    int ans=0;
    int len=strlen(s);
    for(int i=0;i<len;i++){
        ans*=26;
        ans+=(s[i]-'A'+1);
    }
    return ans;
}

coding problems