int n, m;
long long cnt3, cnt4, cnt;
array<int, maxn> deg, vis;
array<vector<int>, maxn> pre, nxt;
array<array<long long, maxn>, 1 << maxn> dp;

cin >> n >> m;
for (int i = 1; i <= m; i++)
{
    int u, v;
    cin >> u >> v;
    pre[u].emplace_back(v), deg[u]++;
    pre[v].emplace_back(u), deg[v]++;
}
for (int u = 1; u <= n; u++)
    for (int v : pre[u])
        if (deg[u] < deg[v] || deg[u] == deg[v] && u < v)
            nxt[u].emplace_back(v);
for (int u = 1; u <= n; u++)
{
    for (int v : nxt[u])
        vis[v] = 1;
    for (int v : nxt[u])
        for (int w : nxt[v])
            cnt3 += vis[w];
    for (int v : nxt[u])
        vis[v] = 0;
}
for (int u = 1; u <= n; u++)
{
    for (int v : pre[u])
        for (int w : nxt[v])
            if (deg[u] < deg[w] || deg[u] == deg[w] && u < w)
                cnt4 += vis[w]++;
    for (int v : pre[u])
        for (int w : nxt[v])
            vis[w] = 0;
}
for (int i = 0; i < n; i++)
    dp[1 << i][i] = 1;
for (int i = 0; i < 1 << n; i++)
    for (int u = 0; u < n; u++)
        if (dp[i][u])
            for (int v : pre[u + 1])
            {
                if ((i & -i) == 1 << --v)
                    cnt += dp[i][u];
                if ((i & -i) <= 1 << v && ~i & 1 << v)
                    dp[i | 1 << v][v] += dp[i][u];
            }

answer.code:3:1: error: ‘array’ does not name a type
    3 | array<int, maxn> deg, vis;
      | ^~~~~
answer.code:4:1: error: ‘array’ does not name a type
    4 | array<vector<int>, maxn> pre, nxt;
      | ^~~~~
answer.code:5:1: error: ‘array’ does not name a type
    5 | array<array<long long, maxn>, 1 << maxn> dp;
      | ^~~~~
answer.code:7:1: error: ‘cin’ does not name a type
    7 | cin >> n >> m;
      | ^~~
answer.code:8:1: error: expected unqualified-id before ‘for’
    8 | for (int i = 1; i <= m; i++)
      | ^~~
answer.code:8:17: error: ‘i’ does not name a type
    8 | for (int i = 1; i <= m; i++)
      |                 ^
answer.code:8:25: error: ‘i’ does not name a type
    8 | for (int i = 1; i <= m; i++)
      |                         ^
answer.code:15:1: error: expected unqualified-id before ‘for’
   15 | for (int u = 1; u <= n; u++)
      | ^~~
answer.code:15:17: error: ‘u’ does not name a type
   15 | for (int u = 1; u <= n; u++)
      |                 ^
answer.code:15:25: error: ‘u’ does not name a type
   15 | for (int u = 1; u <= n; u++)
      |                         ^
answer.code:19:1: error: expected unqualified-id before ‘for’
   19 | for (int u = 1; u <= n; u++)
      | ^~~
answer.code:19:17: error: ‘u’ does not name a type
   19 | for (int u = 1; u <= n; u++)
      |                 ^
answer.code:19:25: error: ‘u’ does not name a type
   19 | for (int u = 1; u <= n; u++)
      |                         ^
answer.code:29:1: error: expected unqualified-id before ‘for’
   29 | for (int u = 1; u <= n; u++)
      | ^~~
answer.code:29:17: error: ‘u’ does not name a type
   29 | for (int u = 1; u <= n; u++)
      |                 ^
answer.code:29:25: error: ‘u’ does not name a type
   29 | for (int u = 1; u <= n; u++)
      |                         ^
answer.code:39:1: error: expected unqualified-id before ‘for’
   39 | for (int i = 0; i < n; i++)
      | ^~~
answer.code:39:17: error: ‘i’ does not name a type
   39 | for (int i = 0; i < n; i++)
      |                 ^
answer.code:39:24: error: ‘i’ does not name a type
   39 | for (int i = 0; i < n; i++)
      |                        ^
answer.code:41:1: error: expected unqualified-id before ‘for’
   41 | for (int i = 0; i < 1 << n; i++)
      | ^~~
answer.code:41:17: error: ‘i’ does not name a type
   41 | for (int i = 0; i < 1 << n; i++)
      |                 ^
answer.code:41:29: error: ‘i’ does not name a type
   41 | for (int i = 0; i < 1 << n; i++)
      |                             ^
answer.code:42:21: error: ‘u’ does not name a type
   42 |     for (int u = 0; u < n; u++)
      |                     ^
answer.code:42:28: error: ‘u’ does not name a type
   42 |     for (int u = 0; u < n; u++)
      |                            ^