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#include <iostream>
#define max 1000000007
using namespace std;
int a[max-6];
 
void schemes() {
	a[1]=0;a[2]=12;
	for(int i=3;i<=(max-7);++i) a[i]=2*a[i-1]+3*a[i-2];
	return;
}
 
int main() {
	ios::sync_with_stdin(false);
	int t,n;
	cin>>t;
	while(t--) {
		cin>>n;
		cout<<a[n]<<endl;
	}
	return 0;
}

prog.cpp:4:12: error: size of array ‘a’ is too large
 int a[max-6];
            ^
prog.cpp: In function ‘void schemes()’:
prog.cpp:7:2: error: ‘a’ was not declared in this scope
  a[1]=0;a[2]=12;
  ^
prog.cpp: In function ‘int main()’:
prog.cpp:13:2: error: ‘sync_with_stdin’ is not a member of ‘std::ios {aka std::basic_ios<char>}’
  ios::sync_with_stdin(false);
  ^
prog.cpp:18:9: error: ‘a’ was not declared in this scope
   cout<<a[n]<<endl;
         ^

Standard output is empty