Merkkijonot

input/code.cpp: In function 'int main()':
input/code.cpp:22:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (long long j=0; j<arr[i].length();j++){
                             ~^~~~~~~~~~~~~~~~
input/code.cpp:32:9: error: 'sort' was not declared in this scope
         sort(l.begin(), l.end());
         ^~~~
input/code.cpp:32:9: note: suggested alternative: 'qsort'
         sort(l.begin(), l.end());
         ^~~~
         qsort
input/code.cpp:33:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j=0;j<l.size();j++){
                     ~^~~~~~~~~
input/code.cpp:34:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(long long k=0;k<l[j].size();k++){
                               ~^~~~~~~~~~~~

#include <iostream>
#include <set> 
#include <vector>
#include <string>
#include <map>
#include <unordered_set>
using namespace std;
 
 
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    long long n;
    cin>>n;
    string arr[n];
    map<string,long long> m;
    for(long long i=0;i<n;i++){
        cin>>arr[i];
    }
    for(long long i=0; i<n; i++){
        map<char,vector<long long>> us;
        for (long long j=0; j<arr[i].length();j++){
                us[arr[i][j]].push_back(j);
        }
        string harmony_hash = to_string(arr[i].length())+":";
        vector<vector<long long>> l;
        for(auto const& it : us){
            if(it.second.size()>1){
                l.push_back(it.second);
            }
        }
        sort(l.begin(), l.end());
        for(int j=0;j<l.size();j++){
            for(long long k=0;k<l[j].size();k++){
                harmony_hash.append(to_string(l[j][k])+",");
            }
 
            harmony_hash.append(":");
        }
        //cout<<harmony_hash<<"\n";
        ++m[harmony_hash];
    }
    long long c=0;
    for(auto const& it : m){
        c=c+it.second*(it.second-1)/2;
    }
    cout<<c<<"\n";
}