Excel Sheet Column Number Problem & Solution

Given a string columnTitle that represents the column title as appears in an Excel sheet, return its corresponding column number.

See the Excel sheet column number problem on LeetCode.

C++ Solution

#pragma GCC optimize("Ofast")
#pragma GCC optimization("unroll-loops")

static const int _=[](){std::ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);return 0;}();

class Solution {
  int titleToNumber(string columnTitle) {
    int result = 0;

    for (int i = 0; i < columnTitle.size(); ++i) {

      // The parentheses to calculate the digits are used to avoid overflow.
      result = result * 26 + (columnTitle[i] - 'A' + 1);

    return result;

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