foo.cc: In function 'int main()':
foo.cc:15:5: error: 'sort' was not declared in this scope
     sort(a,a+n,cmp);
     ^~~~
foo.cc:15:5: note: suggested alternative: 'short'
     sort(a,a+n,cmp);
     ^~~~
     short
foo.cc:11:13: warning: unused variable 's' [-Wunused-variable]
     int i,j,s=0,ans=0;
             ^
foo.cc:12:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~
foo.cc:13:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(i=0;i<n;i++) scanf("%d",&a[i]);
                      ~~~~~^~~~~~~~~~~~
foo.cc:14:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(i=0;i<m;i++) scanf("%d",&b[i]);
                      ~~~~~^~~~~~~~~~~~

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