Anagrams

input/code.cpp: In function 'int main()':
input/code.cpp:21:29: warning: unused variable 'key' [-Wunused-variable]
   for (const auto &[key, val] : ma) {
                             ^

#include <iostream>
#include <algorithm>
#include <vector>
#include <map>
using namespace std;

map<string, vector<string>> ma ;
int n;
string str, str2;
int main() {
  cin >> n;
  for (int i=0; i<n; i++) {
    cin >> str;
    str2 = str;
    sort(str2.begin(), str2.end());
    ma[str2].emplace_back(move(str));
  }
  
  int z = count_if(ma.begin(), ma.end(), [](auto & v) {return v.second.size() > 1;});
  cout << z << endl;
  for (const auto &[key, val] : ma) {
    if (val.size() < 2) continue;
    cout << val.size() << endl;
    for (const auto &str : val) {
      cout << str << endl;
    }
  }
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED