View Compilation Error

0_0_34018968_14347.cpp: In function 'int main()':
0_0_34018968_14347.cpp:90:11: error: 'n' was not declared in this scope
     while(n != 0){
           ^
0_0_34018968_14347.cpp:92:14: error: 'a' was not declared in this scope
         sort(a + 1,a + 1 + n,cmpx);
              ^
0_0_34018968_14347.cpp:92:30: error: 'cmpx' was not declared in this scope
         sort(a + 1,a + 1 + n,cmpx);
                              ^