Main.cc:6:24: error: stray ‘\357’ in program
    6 |     scanf("%d%d",&a,&b)；
      |                        ^
Main.cc:6:25: error: stray ‘\274’ in program
    6 |     scanf("%d%d",&a,&b)；
      |                         ^
Main.cc:6:26: error: stray ‘\233’ in program
    6 |     scanf("%d%d",&a,&b)；
      |                          ^
Main.cc: In function ‘int main()’:
Main.cc:6:24: error: expected ‘;’ before ‘gcd’
    6 |     scanf("%d%d",&a,&b)；
      |                        ^
      |                        ;
    7 |     gcd=exgcd(a,b,&s,&t);
      |     ~~~                 
Main.cc:4:17: warning: unused variable ‘gcd’ [-Wunused-variable]
    4 |     int a,b,s,t,gcd;
      |                 ^~~
Main.cc:6:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    6 |     scanf("%d%d",&a,&b)；
      |     ~~~~~^~~~~~~~~~~~~~