Problem:
Score : 500 points

Problem Statement

We have N locked treasure boxes, numbered 1 to N.

A shop sells M keys. The i-th key is sold for a_i yen (the currency of Japan), and it can unlock b_i of the boxes: Box c_{i1}, c_{i2}, ..., c_{i{b_i}}. Each key purchased can be used any number of times.

Find the minimum cost required to unlock all the treasure boxes. If it is impossible to unlock all of them, print -1.

Constraints

All values in input are integers.

1 \leq N \leq 12

1 \leq M \leq 10^3

1 \leq a_i \leq 10^5

1 \leq b_i \leq N

1 \leq c_{i1} < c_{i2} < ... < c_{i{b_i}} \leq N

Input

Input is given from Standard Input in the following format:

N M
a_1 b_1
c_{11} c_{12} ... c_{1{b_1}}
:
a_M b_M
c_{M1} c_{M2} ... c_{M{b_M}}

Output

Print the minimum cost required to unlock all the treasure boxes.
If it is impossible to unlock all of them, print -1.

Sample Input 1

2 3
10 1
1
15 1
2
30 2
1 2

Sample Output 1

25

We can unlock all the boxes by purchasing the first and second keys, at the cost of 25 yen, which is the minimum cost required.

Sample Input 2

12 1
100000 1
2

Sample Output 2

-1

We cannot unlock all the boxes.

Sample Input 3

4 6
67786 3
1 3 4
3497 1
2
44908 3
2 3 4
2156 3
2 3 4
26230 1
2
86918 1
3

Sample Output 3

69942

Solution in C# (.NET Core 3.1.201) (judge verdict: Time Limit Exceeded)

using System.Collections;
using System.Text;
using System.Threading.Tasks;
using static System.Math;
using static System.Console;
using System.Collections.Generic;
using System.Linq;
using System;
using System.Numerics;
using System.IO.Pipes;
using System.Threading;
using System.Net;
using System.Runtime.Serialization;
using System.Globalization;
using System.Collections.Immutable;
using System.Data.SqlTypes;
using System.Security.Cryptography;

class Program
{
    #region Reader

    static string ReadStr => Console.ReadLine();
    static string[] ReadStrs => Console.ReadLine().Split(' ');
    static int ReadInt => Convert.ToInt32(Console.ReadLine());
    static int[] ReadInts => Console.ReadLine().Split(' ').Select(s => Convert.ToInt32(s)).ToArray();
    static long ReadLong => Convert.ToInt64(Console.ReadLine());
    static long[] ReadLongs => Console.ReadLine().Split(' ').Select(s => Convert.ToInt64(s)).ToArray();
    static long[,] ReLongMatrix(int r, int c)
    {
        var mat = new long[r, c];
        for (int i = 0; i < r; ++i)
        {
            var x = ReadLongs;
            for (int j = 0; j < c; ++j)
            {
                mat[i, j] = x[j];
            }
        }
        return mat;
    }
    static Tuple<string, string>[] ReTupleStr(int n)
    {
        List<Tuple<string, string>> list = new List<Tuple<string, string>>();
        for (int i = 0; i < n; ++i)
        {
            var ab = ReadStrs;
            list.Add(new Tuple<string, string>(ab[0], ab[1]));
        }
        return list.ToArray();
    }
    static Tuple<long, long>[] ReTupleLong(int n)
    {
        List<Tuple<long, long>> list = new List<Tuple<long, long>>();
        for (int i = 0; i < n; ++i)
        {
            var ab = ReadLongs;
            list.Add(new Tuple<long, long>(ab[0], ab[1]));
        }
        return list.ToArray();
    }
    static Tuple<int, int>[] ReadTupleInt(int n)
    {
        List<Tuple<int, int>> list = new List<Tuple<int, int>>();
        for (int i = 0; i < n; ++i)
        {
            var ab = ReadInts;
            list.Add(new Tuple<int, int>(ab[0], ab[1]));
        }
        return list.ToArray();
    }
    static Tuple<double, double>[] ReTupleDouble(int n)
    {
        List<Tuple<double, double>> list = new List<Tuple<double, double>>();
        for (int i = 0; i < n; ++i)
        {
            var ab = ReadLongs;
            list.Add(new Tuple<double, double>(ab[0], ab[1]));
        }
        return list.ToArray();
    }
    static Dictionary<int, HashSet<int>> ReAdjacencyList(int N, int M)
    {
        Dictionary<int, HashSet<int>> dict = new Dictionary<int, HashSet<int>>();
        for (int i = 0; i <= N; ++i)
        {
            dict.Add(i, new HashSet<int>());
        }
        for (int i = 0; i < M; ++i)
        {
            var ab = ReadInts;
            dict[ab[0]].Add(ab[1]);
            dict[ab[1]].Add(ab[0]);
        }
        return dict;
    }
    #endregion
    static void Swap<T>(ref T a, ref T b)
    {
        T temp = a;
        a = b;
        b = temp;
    }
    static int mod = (int)Pow(10, 9) + 7;


    public static long GetInv(long a, long mod = 1000000007)
    {
        return PowerMod(a, mod - 2, mod);
    }
    public static long Combination(long a, long b, long mod = 1000000007)
    {
        if (b < 0 || b > a) return 0;
        if (b > a / 2) b = a - b;
        long numerator = Factorial(a, mod);
        long denominator = (Factorial(b, mod) * Factorial(a - b, mod)) % mod;

        return (numerator * GetInv(denominator, mod)) % mod;
    }
    public static long Factorial(long n, long mod = 1000000007)
    {
        if (n == 0) return 1;
        if (n == 1) return 1;
        long ans = n;
        for (int i = 2; i < n; i++)
        {
            ans = (ans * i) % mod;
        }

        return ans;
    }
    private static long PowerMod(long a, long n, long mod = 1000000007)
    {
        if (n == 0) return 1;
        if (n == 1) return a;

        long p = PowerMod(a, n / 2, mod);
        if (n % 2 == 1) return ((p * p) % mod * a) % mod;
        else return (p * p) % mod;
    }

    /// <summary>
    /// 最小公倍数
    /// </summary>
    /// <param name="a"></param>
    /// <param name="b"></param>
    /// <returns></returns>
    public static long Lcm(long a, long b)
    {
        return a * b / Gcd(a, b);
    }


    /// <summary>
    /// 最大公約数
    /// </summary>
    /// <param name="a"></param>
    /// <param name="b"></param>
    /// <returns></returns>
    public static long Gcd(long a, long b)
    {
        if (a < b)
            // 引数を入替えて自分を呼び出す
            return Gcd(b, a);
        while (b != 0)
        {
            var remainder = a % b;
            a = b;
            b = remainder;
        }
        return a;
    }

    public struct MyStruct
    {
        public MyStruct(long a, long b)
        {
            A = a;
            B = b;
        }
        public long A;
        public long B;

    }


    public class PriorityQueue<T> : IEnumerable<T>
    {
        private readonly List<T> _data = new List<T>();
        private readonly IComparer<T> _comparer;
        private readonly bool _isDescending;

        public PriorityQueue(IComparer<T> comparer, bool isDescending = true)
        {
            _comparer = comparer;
            _isDescending = isDescending;
        }

        public PriorityQueue(Comparison<T> comparison, bool isDescending = true)
            : this(Comparer<T>.Create(comparison), isDescending)
        {
        }

        public PriorityQueue(bool isDescending = true)
            : this(Comparer<T>.Default, isDescending)
        {
        }

        public void Enqueue(T item)
        {
            _data.Add(item);
            var childIndex = _data.Count - 1;
            while (childIndex > 0)
            {
                var parentIndex = (childIndex - 1) / 2;
                if (Compare(_data[childIndex], _data[parentIndex]) >= 0)
                    break;
                Swap(childIndex, parentIndex);
                childIndex = parentIndex;
            }
        }

        public T Dequeue()
        {
            var lastIndex = _data.Count - 1;
            var firstItem = _data[0];
            _data[0] = _data[lastIndex];
            _data.RemoveAt(lastIndex--);
            var parentIndex = 0;
            while (true)
            {
                var childIndex = parentIndex * 2 + 1;
                if (childIndex > lastIndex)
                    break;
                var rightChild = childIndex + 1;
                if (rightChild <= lastIndex && Compare(_data[rightChild], _data[childIndex]) < 0)
                    childIndex = rightChild;
                if (Compare(_data[parentIndex], _data[childIndex]) <= 0)
                    break;
                Swap(parentIndex, childIndex);
                parentIndex = childIndex;
            }
            return firstItem;
        }

        public T Peek()
        {
            return _data[0];
        }

        private void Swap(int a, int b)
        {
            var tmp = _data[a];
            _data[a] = _data[b];
            _data[b] = tmp;
        }

        private int Compare(T a, T b)
        {
            return _isDescending ? _comparer.Compare(b, a) : _comparer.Compare(a, b);
        }

        public int Count => _data.Count;

        public IEnumerator<T> GetEnumerator()
        {
            return _data.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
    }
    public class PriorityQueue<TKey, TValue> : IEnumerable<TValue>
    {
        private readonly List<KeyValuePair<TKey, TValue>> _data = new List<KeyValuePair<TKey, TValue>>();
        private readonly bool _isDescending;
        private readonly Func<TValue, TKey> _keySelector;
        private readonly IComparer<TKey> _keyComparer;

        public PriorityQueue(Func<TValue, TKey> keySelector, bool isDescending = true)
            : this(keySelector, Comparer<TKey>.Default, isDescending)
        {
        }

        public PriorityQueue(Func<TValue, TKey> keySelector, IComparer<TKey> keyComparer, bool isDescending = true)
        {
            _keySelector = keySelector;
            _keyComparer = keyComparer;
            _isDescending = isDescending;
        }

        public void Enqueue(TValue item)
        {
            _data.Add(new KeyValuePair<TKey, TValue>(_keySelector(item), item));
            var childIndex = _data.Count - 1;
            while (childIndex > 0)
            {
                var parentIndex = (childIndex - 1) / 2;
                if (Compare(_data[childIndex].Key, _data[parentIndex].Key) >= 0)
                    break;
                Swap(childIndex, parentIndex);
                childIndex = parentIndex;
            }
        }

        public TValue Dequeue()
        {
            var lastIndex = _data.Count - 1;
            var firstItem = _data[0];
            _data[0] = _data[lastIndex];
            _data.RemoveAt(lastIndex--);
            var parentIndex = 0;
            while (true)
            {
                var childIndex = parentIndex * 2 + 1;
                if (childIndex > lastIndex)
                    break;
                var rightChild = childIndex + 1;
                if (rightChild <= lastIndex && Compare(_data[rightChild].Key, _data[childIndex].Key) < 0)
                    childIndex = rightChild;
                if (Compare(_data[parentIndex].Key, _data[childIndex].Key) <= 0)
                    break;
                Swap(parentIndex, childIndex);
                parentIndex = childIndex;
            }
            return firstItem.Value;
        }

        public TValue Peek()
        {
            return _data[0].Value;
        }

        private void Swap(int a, int b)
        {
            var tmp = _data[a];
            _data[a] = _data[b];
            _data[b] = tmp;
        }

        private int Compare(TKey a, TKey b)
        {
            return _isDescending ? _keyComparer.Compare(b, a) : _keyComparer.Compare(a, b);
        }

        public int Count => _data.Count;

        public IEnumerator<TValue> GetEnumerator()
        {
            return _data.Select(r => r.Value).GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
    }




    static int[] BinarySearch(IEnumerable<long> numbers, Func<long, bool> judge)
    {
        int max = numbers.Count();
        int min = -1;
        int mid = (min + max) / 2;

        while (max - min > 1)
        {
            if (judge(numbers.ElementAt(mid)))
            {
                min = mid;
                mid = (mid + max) / 2;
            }
            else
            {
                max = mid;
                mid = (mid + min) / 2;
            }
        }

        if (max == numbers.Count()) return new int[2] { mid, mid + 1 };
        else if (min == -1) return new int[2] { -1, 0 };
        else
        {
            return judge(numbers.ElementAt(mid)) != judge(numbers.ElementAt(mid + 1)) ? new int[2] { mid, mid + 1 }
            : new int[2] { mid - 1, mid };
        }
    }

    public static Dictionary<int, int> PrimeFactors(int n)
    {
        int i = 2;
        int tmp = n;
        Dictionary<int, int> d = new Dictionary<int, int>();

        while (i * i <= n) //※1
        {
            if (tmp % i == 0)
            {
                tmp /= i;
                if (d.ContainsKey(i)) d[i]++;
                else d.Add(i, 1);
            }
            else
            {
                i++;
            }
        }
        if (tmp != 1)
        {
            if (d.ContainsKey(tmp)) d[tmp]++;
            else d.Add(tmp, 1);
        }
        return d;
    }

    public static List<int> To3Sinsu(int i)
    {
        List<int> ans = new List<int>();
        while (i >= 3)
        {
            int d = i / 3;
            int r = i % 3;

            ans.Add(r);
            i = d;
        }
        ans.Add(i);
        return ans;
    }

    public static int[] ToNSinsu(int i, int baseNum, int digit)
    {
        int[] ans = new int[digit];
        int index = 0;
        while (i >= baseNum)
        {
            int d = i / baseNum;
            int r = i % baseNum;

            ans[index] = r;
            index++;
            i = d;
        }
        ans[index] = i;
        return ans;
    }




    public class UnionFind
    {
        public UnionFind(int number)
        {
            Data = new List<int>();
            for (int i = 0; i < number; i++) Data.Add(-1);
        }

        /// <summary>
        /// 負なら親(絶対値はサイズ)　正なら子(絶対値は親のID)
        /// </summary>
        public List<int> Data { get; }

        public int Find(int node)
        {
            //自身が親なら、そのまま返す
            if (Data[node] < 0) return node;

            //子なら、その親を呼び、さらにその親を探す。再帰的に呼び出しrootを見つけ、全ての子の親をrootにする
            return Data[node] = Find(Data[node]);
        }

        public bool Unite(int node1, int node2)
        {
            //二つの点の親をさがす
            node1 = Find(node1);
            node2 = Find(node2);

            //二つの親が一致しているなら、することはない
            if (node1 == node2) return false;

            int parent = 0;
            int newSon = 0;

            //サイズが小さいほうが、大きい方の子になる(親のDataの値は負であることに注意)
            if (Data[node1] > Data[node2])
            {
                parent = node2;
                newSon = node1;
            }
            else
            {
                parent = node1;
                newSon = node2;
            }

            Data[parent] += Data[newSon];
            Data[newSon] = parent;

            return true;
        }
    }


    static int[] BinarySearch(IEnumerable<int> numbers, Func<int, bool> judge)
    {
        int max = numbers.Count();
        int min = -1;
        int mid = (min + max) / 2;

        while (max - min > 1)
        {
            if (judge(numbers.ElementAt(mid)))
            {
                min = mid;
                mid = (mid + max) / 2;
            }
            else
            {
                max = mid;
                mid = (mid + min) / 2;
            }
        }

        if (max == numbers.Count()) return new int[2] { mid, mid + 1 };
        else if (min == -1) return new int[2] { -1, 0 };
        else
        {
            return judge(numbers.ElementAt(mid)) != judge(numbers.ElementAt(mid + 1)) ? new int[2] { mid, mid + 1 }
            : new int[2] { mid - 1, mid };
        }
    }


    static void Main()
    {
        int[] NM = ReadInts;
        int N = NM[0];
        int M = NM[1];
        int infty = (int)Pow(10, 9);

        int[][] keys = new int[M][];
        int[] keyCosts = new int[M];

        for (int i = 0; i < M; i++)
        {
            int[] ab = ReadInts;
            int[] cs = ReadInts;
            for (int j = 0; j < cs.Length; j++)
            {
                cs[j]--;
            }
            keys[i] = cs;
            keyCosts[i] = ab[0];
        }


        int[,] dp = new int[M + 1, (int)Pow(2, N)];
        for (int m = 0; m < M + 1; m++)
        {
            for (int n = 0; n < (int)Pow(2, N); n++)
            {
                dp[m, n] = infty;
            }
        }

        dp[0, 0] = 0;
        int ans = infty;

        int mm = (int)Pow(2, N);


        Dictionary<int, int[]> bitDic = new Dictionary<int, int[]>();
        for (int i = 0; i < (int)Pow(2, N); i++)
        {
            bitDic.Add(i, ToNSinsu(i, 2, N));
        }

        //m-1番目の鍵を買うか否かを考える
        for (int m = 1; m <= M; m++)//10^3
        {

            for (int n = 0; n < (int)Pow(2, N); n++)//10^3
            {
               // int[] havingKeys = bitDic[n];
                int[] havingKeys = ToNSinsu(n,2,N);

                //m-1を買わなかった場合
                dp[m, n] = Min(dp[m, n], dp[m - 1, n]);

                //m-1を買った場合
                for (int c = 0; c < keys[m - 1].Length; c++)
                {
                    havingKeys[keys[m - 1][c]] = 1;
                }
                int bitKey = GetHavingKey(havingKeys);
                int cost = dp[m - 1, n] + keyCosts[m - 1];

                dp[m, bitKey] = Min(dp[m, bitKey], cost);
                if (bitKey == mm - 1)
                {
                    ans = Min(ans, cost);
                }
            }
        }

        if (ans == infty) WriteLine(-1);
        else WriteLine(ans);
    }

    public static int GetHavingKey(IEnumerable<int> list)
    {
        int ans = 0;

        for (int i = 0; i < list.Count(); i++)
        {
            if (list.ElementAt(i) == 0) continue;
            ans += (int)Pow(2, i);
        }
        return ans;
    }



    public class Key
    {
        public Key(int cost, List<int> boxes)
        {
            Cost = cost;
            Boxes = boxes;
        }
        public int Cost { get; }
        public List<int> Boxes { get; }
    }

}