View Compilation Error

0_0_29879023_12592.cpp: In function 'int main()':
0_0_29879023_12592.cpp:119:33: error: expected ')' before 'Q'
         for(int i=n-2; i>=0; i--Q)
                                 ^
0_0_29879023_12592.cpp:119:33: error: 'Q' was not declared in this scope