boring lection

#include <iostream>
#include <vector>
#include <map>
#include <string>

using namespace std;

int main()
{
    std::string word;
    std::getline(cin,word);

    int word_sz = word.size()-1;
    vector<int> Mask;
    vector<int> Counts;

    for(int i = word_sz; i > 0; i--){
        Mask.push_back(i);
        Counts.push_back(i+1);
    }
    Counts.emplace_back(1);

    int mask_sz = Mask.size();
    int disp = 0;

    for(int i = 1; i < word_sz; i++)
    {
        int CTR = 0;
        for(int k = disp; k < mask_sz; k++){
            Counts[i+CTR] += Mask[k];
            CTR++;
        }

        disp++;
    }
    Counts[Counts.size()-1]++;

    map<char,int> Freq;



    for(register int i = 0; i < word_sz+1; i++)
        Freq[word[i]] += Counts[i];

    for(auto &I : Freq)
        cout << I.first << ": " << I.second << endl;

    /*std::string Buf;
    for(auto K = Freq.cbegin(); K != Freq.cend(); K++){
        Buf += (K->first + ": " + to_string(K->second) + '\n');
    }*/

    /*string Dec = "";
    int ctr = word_sz;
    for(int x = 0; x < word_sz; x++)
    {
        for(int y = x; y < ctr; y++){
            cout << Dec << word.substr(x,y) << " ::: X,Y = " << x << " " << y << endl;
        }
        Dec+=" ";
    }*/

    return 0;
}