/in/foo.cc:43:25: error: stray '\357' in program
         m=gcd(a*i-b,b*i)；//把这1/i从还要枚举的分数和中减去，a/b-1/i=(a*i-b)/(b*i);
                         ^
/in/foo.cc:43:26: error: stray '\274' in program
         m=gcd(a*i-b,b*i)；//把这1/i从还要枚举的分数和中减去，a/b-1/i=(a*i-b)/(b*i);
                          ^
/in/foo.cc:43:27: error: stray '\233' in program
         m=gcd(a*i-b,b*i)；//把这1/i从还要枚举的分数和中减去，a/b-1/i=(a*i-b)/(b*i);
                           ^
/in/foo.cc: In function 'void slove(int, int, int)':
/in/foo.cc:44:9: error: expected ';' before 'slove'
         slove((i*a-b)/m,b*i/m,k+1);//取最约分数。
         ^~~~~
/in/foo.cc:24:9: warning: unused variable 'i' [-Wunused-variable]
     int i,m,s,t;
         ^