View Compilation Error

0_0_29621331_21490.cpp:18:17: error: stray '\243' in program
                 num=0；
                 ^
0_0_29621331_21490.cpp:18:17: error: stray '\273' in program
0_0_29621331_21490.cpp: In function 'int main()':
0_0_29621331_21490.cpp:19:3: error: expected ';' before 'for'
   for(int j=1;j<=2*n;j++)
   ^
0_0_29621331_21490.cpp:19:15: error: 'j' was not declared in this scope
   for(int j=1;j<=2*n;j++)
               ^