View Compilation Error

0_0_33695160_28245.cpp: In function 'std::deque<bool> mult(std::deque<bool>, std::deque<bool>)':
0_0_33695160_28245.cpp:30:16: error: 'n' was not declared in this scope
  for(int i=0;i<n;i++){
                ^
0_0_33695160_28245.cpp:32:2: error: expected ';' before '}' token
  }
  ^