/in/foo.cc:30:1: error: stray '\343' in program
 　　for(int i=k;i<=n-k;i++)//1
 ^
/in/foo.cc:30:2: error: stray '\200' in program
 　　for(int i=k;i<=n-k;i++)//1
  ^
/in/foo.cc:30:3: error: stray '\200' in program
 　　for(int i=k;i<=n-k;i++)//1
   ^
/in/foo.cc:30:4: error: stray '\343' in program
 　　for(int i=k;i<=n-k;i++)//1
    ^
/in/foo.cc:30:5: error: stray '\200' in program
 　　for(int i=k;i<=n-k;i++)//1
     ^
/in/foo.cc:30:6: error: stray '\200' in program
 　　for(int i=k;i<=n-k;i++)//1
      ^