Excel. Перевод в столбец

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#include <iostream>
#include <cmath>
#include <algorithm>
#include <map>
using namespace std;
map <char, int> L;

int nm(string x){
    reverse(x.begin(), x.end());
    int sz = x.size();
    int res = 0;
    for (int i=0;i<sz;++i){
        res += pow(26, i) * L[x[i]];
    }
    return res;
}


int main()
{
    int cnt = 1;
    for (int i = 65; i <= 90;++i){
        char l = i;
        //cout<<"l= "<<l<<' '<<cnt<<'\n';
        L[l] = cnt;
        cnt++;
    }
    //for (auto x: L)cout<<x.first<<' '<<x.second<<'\n';
    cout<<nm("AA");
}