/in/foo.c: In function 'main':
/in/foo.c:4:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%d %d",&a,&b);
  ^~~~~
/in/foo.c:4:2: warning: incompatible implicit declaration of built-in function 'scanf'
/in/foo.c:4:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
/in/foo.c:8:6: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  if(0<b<a<1e18){
     ~^~
/in/foo.c:8:8: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  if(0<b<a<1e18){
     ~~~^~
/in/foo.c:12:5: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
     printf("Yes\n");
     ^~~~~~
/in/foo.c:12:5: warning: incompatible implicit declaration of built-in function 'printf'
/in/foo.c:12:5: note: include '<stdio.h>' or provide a declaration of 'printf'
/in/foo.c:19:4: warning: incompatible implicit declaration of built-in function 'printf'
   }printf("No\n");
    ^~~~~~
/in/foo.c:19:4: note: include '<stdio.h>' or provide a declaration of 'printf'