Anagrams

input/code.cpp: In function 'int main()':
input/code.cpp:53:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for (int j = s; j < i; j++) cout << v[j].second << endl;
                                 ~~^~~

#include <iostream>
#include <string>
#include <algorithm>
#include <vector>

using namespace std;

int main() {
    long int n;
    cin >> n;
    vector<pair<string, string>> v; // (sorted, orginal)
    string st;
    
    for (unsigned int i = 0; i < n; i++) {
        cin >> st;
        string sttmp = st;
        sort(sttmp.begin(), sttmp.end());
        v.push_back(pair<string, string>(sttmp, st));
    }

    sort(v.begin(), v.end(),[] (const auto &a, const auto &b)
    {
        return a.first < b.first;
    }); 
    
    
    vector<int> count(v.size() + 1, 0);
    n = 0;
    
    for (unsigned i = 0; i < v.size() - 1; i++) {
        if (v[i].first == v[i+1].first)
        {
            if (count[i] == 0)
            {
                count[i] = 1;
                n++;
            }
            count[i + 1] = count[i] + 1;
        }
    }
    
    cout << n << endl;
    
    if (n > 0)
    {
        unsigned i = 0, s = 0;
        while (i < count.size())
        {
            if (count[i] != 0) i++;
            else
            {
                cout << count[i - 1] << endl;
                for (int j = s; j < i; j++) cout << v[j].second << endl;
                while (count[i] == 0 && i < count.size()) i++;
                s = i;
            }
        }
    }
    return 0;
}

Test 1

Verdict: RUNTIME ERROR

Test 2

Verdict: RUNTIME ERROR

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