code bằng C++

`->` sử dụng thuật lù bò

#include <iostream>
using namespace std;
int ma[100];
string s;
int main() 
{
    getline(cin, s);
    for(int a = 0; a < s.size(); a++)
        s[a] = tolower(s[a]);
    for(char c:s)
    {
        if(c != ' ')ma[int(c) - 96]++;
    }
    for(int a = 1; a <= 30; a++)
        if(ma[a] != 0)
            cout << char(a+96) << " " << ma[a] << "\n";
    return 0;
}

$#khanhtaon$

#include <bits/stdc++.h>
using namespace std;

string s;
long long cnt[26] = {0};
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    getline(cin, s);
    transform(s . begin(), s . end(), s . begin(), ::tolower);
    for (long long i = 0; i < s . size(); ++i)
    {
        if (isalpha(s[i]))
        {
            cnt[s[i] - 'a']++;
        }
    }
    for (long long i = 0; i < 26; ++i)
    {
        if (cnt[i] > 0)
        {
            char c = 'a' + i;
            cout << c << " " << cnt[i] << '\n';
        }
    }
    return 0;
}