/in/foo.cc: In function 'int main()':
/in/foo.cc:13:15: error: 'sort' was not declared in this scope
     sort(a,a+3);
               ^
/in/foo.cc:21:45: error: lvalue required as left operand of assignment
     else if(a[0]+n-1 = a[2] && a[1]+1 == a[2]){
                                             ^
/in/foo.cc:25:45: error: lvalue required as left operand of assignment
     else if(a[0]+n-1 = a[2] && a[0]+1 == a[1]){
                                             ^
/in/foo.cc:14:9: warning: unused variable 'temp' [-Wunused-variable]
     int temp;
         ^~~~