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B. Hyperset.cpp
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B. Hyperset.cpp
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#include <bits/stdc++.h>
using namespace std;
#define _ ios_base::sync_with_stdio(0); cin.tie(0);
const char diferent(const char c1, const char c2)
{
if(c1 != 'S' && c2 != 'S') return 'S';
else if(c1 != 'E' && c2 != 'E') return 'E';
return 'T';
}
int main() { _
int n, s;
long p = 0;
;
cin >> n >> s;
set<string> cards;
string card;
for (int i = 0; i < n; i++)
{
cin >> card;
cards.insert(card);
}
for(set<string>::iterator it1 = cards.begin(); it1 != prev(cards.end()); it1++)
{
for(set<string>::iterator it2 = next(it1); it2 != cards.end(); it2++)
{
string candidat;
for (int i = 0; i < s; i++)
{
if((*it1)[i] == (*it2)[i]) candidat += (*it1)[i];
else candidat += diferent((*it1)[i],(*it2)[i]);
}
if(cards.find(candidat) != cards.end()) p++;
}
}
cout << p/3 << '\n' ;
}