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#include <iostream>
using namespace std;
 
int main() {
	int t;
	cin>>t;
	while(t--){
		cin>>w;
		if(!w%2){
			cout<<"no\n";
			continue
		}
		int i = 1
		int c = w;
		while(c--){
			int h;
			cin>>h;
			if(c*2>w)
				if(h!=i++) cout<<"no\n";
			else
				if(h!=i--) cout<<"no\n";
		}
		if(w<0) cout<<"yes\n";
	}
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:8:8: error: ‘w’ was not declared in this scope
   cin>>w;
        ^
prog.cpp:12:3: error: expected ‘;’ before ‘}’ token
   }
   ^
prog.cpp:14:3: error: expected ‘,’ or ‘;’ before ‘int’
   int c = w;
   ^~~
prog.cpp:15:9: error: ‘c’ was not declared in this scope
   while(c--){
         ^

Standard output is empty