Language: C++

#pragma GCC target("avx")  // CPU 処理並列化
#pragma GCC optimize("O3")  // CPU 処理並列化
#pragma GCC optimize("unroll-loops")  // 条件処理の呼び出しを減らす
// #define BEGIN_STACK_EXTEND(size) void * stack_extend_memory_ = malloc(size);void * stack_extend_origin_memory_;char * stack_extend_dummy_memory_ = (char*)alloca((1+(int)(((long long)stack_extend_memory_)&127))*16);*stack_extend_dummy_memory_ = 0;asm volatile("mov %%rsp, %%rbx\nmov %%rax, %%rsp":"=b"(stack_extend_origin_memory_):"a"((char*)stack_extend_memory_+(size)-1024));
// #define END_STACK_EXTEND asm volatile("mov %%rax, %%rsp"::"a"(stack_extend_origin_memory_));free(stack_extend_memory_);

#include<stdio.h>
#include<math.h>
#include<algorithm>
#include<queue>
#include<deque>
#include<stack>
#include<string>
#include<string.h>
#include<vector>
#include<set>
#include<map>
#include<bitset>
#include<stdlib.h>
#include<cassert>
#include<time.h>
#include<bitset>
#include<numeric>
#include<unordered_set>
#include<unordered_map>
#include<complex>
using namespace std;
const long long mod=1000000007;
const long long inf=mod*mod;
const long long d2=(mod+1)/2;
const long double EPS=1e-9;
const long double INF=1e+10;
const long double PI=acos(-1.0);
const int C_SIZE = 3100000;
const int UF_SIZE = 3100000;
namespace{
	long long fact[C_SIZE];
	long long finv[C_SIZE];
	long long inv[C_SIZE];
	inline long long Comb(int a,int b){
	 	if(a<b||b<0)return 0;
	 	return fact[a]*finv[b]%mod*finv[a-b]%mod;
	}
	void init_C(int n){
		fact[0]=finv[0]=inv[1]=1;
		for(int i=2;i<n;i++){
			inv[i]=(mod-(mod/i)*inv[mod%i]%mod)%mod;
		}
		for(int i=1;i<n;i++){
			fact[i]=fact[i-1]*i%mod;
			finv[i]=finv[i-1]*inv[i]%mod;
		}
	}
	long long pw(long long a,long long b){
		if(a<0LL)return 0;
		if(b<0LL)return 0;
		long long ret=1;
		while(b){
			if(b%2)ret=ret*a%mod;
			a=a*a%mod;
			b/=2;
		}
		return ret;
	}
	long long pw_mod(long long a,long long b,long long M){
		if(a<0LL)return 0;
		if(b<0LL)return 0;
		long long ret=1;
		while(b){
			if(b%2)ret=ret*a%M;
			a=a*a%M;
			b/=2;
		}
		return ret;
	}
	int pw_mod_int(int a,int b,int M){
		if(a<0)return 0;
		if(b<0)return 0;
		int ret=1;
		while(b){
			if(b%2)ret=(long long)ret*a%M;
			a=(long long)a*a%M;
			b/=2;
		}
		return ret;
	}
	int ABS(int a){return max(a,-a);}
	long long ABS(long long a){return max(a,-a);}
	double ABS(double a){return max(a,-a);}
	int sig(double r) { return (r < -EPS) ? -1 : (r > +EPS) ? +1 : 0; }
	int UF[UF_SIZE];
	void init_UF(int n){
		for(int i=0;i<n;i++)UF[i]=-1;
	}
	int FIND(int a){
		if(UF[a]<0)return a;
		return UF[a]=FIND(UF[a]);
	}
	void UNION(int a,int b){
		a=FIND(a);b=FIND(b);if(a==b)return;
		if(UF[a]>UF[b])swap(a,b);
		UF[a]+=UF[b];UF[b]=a;
	}
}
// ここから編集しろ
int L[110];
int R[110];
pair<long long,long long> dp[2][1<<19];
int K[1<<19];
int TMP[30];
vector<int>to[1<<19];
int main(){
	int a,b;
	scanf("%d%d",&a,&b);
	for(int i=0;i<b;i++){
		scanf("%d%d",L+i,R+i);
		L[i]--;R[i]--;
	}
	int n=a-1;
	for(int i=0;i<(1<<n);i++){
		init_UF(a);
		for(int j=0;j<n;j++){
			if(i&(1<<j))UNION(L[j],R[j]);
			else to[i].push_back(1<<j);
		}
		for(int j=0;j<a;j++)TMP[j]=FIND(j);
		for(int j=0;j<b;j++){
			if(TMP[L[j]]==TMP[R[j]])K[i]++;
		}
	}
 
	dp[0][0].first=1;
	for(int i=0;i<b;i++){
		int h=i%2;
		for(int j=(1<<n)-1;j>=0;j--){
			if(!dp[h][j].first){
				dp[!h][j].first=dp[!h][j].second=0;
				continue;
			}
			if(K[j]>i){
				dp[!h][j].first=dp[h][j].first*(K[j]-i);
				dp[!h][j].second=dp[h][j].second*(K[j]-i);
			}
			long long ad=dp[h][j].second+dp[h][j].first*(i+1);
			for(int k=0;k<to[j].size();k++){
				dp[!h][j|to[j][k]].first+=dp[h][j].first;
				dp[!h][j|to[j][k]].second+=ad
			}
		}
		for(int j=0;j<(1<<n);j++){
			dp[!h][j].first%=mod;
			dp[!h][j].second%=mod;
		}
	}
	printf("%lld\n",dp[b%2][(1<<n)-1].second%mod);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:147:62: error: expected ';' before '}' token
  147 |                                 dp[!h][j|to[j][k]].second+=ad
      |                                                              ^
      |                                                              ;
  148 |                         }
      |                         ~