Giúp mik vssss code c++ nha

$\color{#1fdb91}{\texttt{C}}\color{#0aaec9}{\texttt{+}}\color{#e9418e}{\texttt{+}}$

#include <bits/stdc++.h>

#define ll long long

using namespace std;

ll c['z' + 5];

int main() {
    
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);
    
    ll n; cin >> n; cin.ignore();
    string s; getline(cin, s);
    
    ll res=0;
    
    for (ll i=0; i<n; ++i) {
        res += c[s[i]];
        ++ c[s[i]];
    }
    
    cout << res;
    
}

$\\$
\begin{array}{c|c|c}\color{#ffd710}{\texttt{\{}} \color{#8655d6}{\texttt{\{}}\ \ \color{#8cdcda}{\text{Daoanhviet96}}\ \ \color{#8655d6}{\texttt{\}}} \color{#ffd710}{\texttt{\}}}\end{array}