foo.cc:25:31: error: stray '\357' in program
         l=read();r=read();mid=（l+r)//2;
                               ^
foo.cc:25:32: error: stray '\274' in program
         l=read();r=read();mid=（l+r)//2;
                                ^
foo.cc:25:33: error: stray '\210' in program
         l=read();r=read();mid=（l+r)//2;
                                 ^
foo.cc: In function 'int main()':
foo.cc:25:37: error: expected ';' before ')' token
         l=read();r=read();mid=（l+r)//2;
                                     ^

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