foo.cc: In function 'int main()':
foo.cc:7:5: error: 'scanf' was not declared in this scope
    7 |     scanf("%d",&n);
      |     ^~~~~
foo.cc:11:15: error: 'sqrt' was not declared in this scope
   11 |         num = sqrt(b1);
      |               ^~~~
foo.cc:14:20: error: 'gcd' was not declared in this scope
   14 |                 if(gcd(j,a0)==a1&&j*b0/gcd(j,b0)==b1){
      |                    ^~~
foo.cc:21:20: error: 'gcd' was not declared in this scope
   21 |                 if(gcd(num2,a0)==a1&&num2*b0/gcd(num2,b0)==b1){
      |                    ^~~
foo.cc:26:9: error: 'printf' was not declared in this scope
   26 |         printf("%d\n",count);
      |         ^~~~~~
foo.cc:1:1: note: 'printf' is defined in header '<cstdio>'; did you forget to '#include <cstdio>'?
  +++ |+#include <cstdio>
    1 | int main(){

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