гирлянда_WA_debug

#include <iostream>
#include <set>
#include <vector>
#include <algorithm>
#define pb push_back
#include <ctime>
using namespace std;



int f(string s)
{
    set <char> all;
    vector <char> v;
    for (int i = 0; i < 4; ++i) {
        char k = s[i];
        all.insert(k);
        v.pb(k);
    }
    if (all.size() == 1) {
        return -1;
    }
    if (all.size() == 2) {
        int x = count(v.begin(), v.end(), v[0]);
        if (x == 1 || x == 3) {
            return 6;
        }
    }
    return 4;
}

int sol(string s) {
    vector<int> cnt(10);
    for (auto c : s) ++cnt[c - '0'];
    int mx = *max_element(cnt.begin(), cnt.end());
    if (mx == 4) return -1;
    else if (mx == 3) return 6;
    else return 4;
}

string gen() {
    string s;
    for (int i = 0; i < 4; ++i) {
        char k;
        int x = rand() % 10;
        k = (int)'0' + x;
        s += k;
    }
    return s;
}

/*
3
9546
0000
3313
*/
int main()
{
    //int t; cin >> t;
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    //for (int i = 0; i < t; ++i)
        while(1) {
        string s;
        // cin >> s;
        s = gen();
        cout << s << "\n";
        int my = f(s);
        int he = sol(s);
        if (he != my) {
            cout << "WA\n";
            cout << "my = " << my << "\n";
            cout << "he = " << he << "\n";
            break;
        }
    }
}