foo.cc: In function 'int main()':
foo.cc:7:10: warning: unused variable 'j' [-Wunused-variable]
  int n,i,j,Sfish,Lfish,ans;
          ^
foo.cc:8:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
foo.cc:10:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&s[i]);
   ~~~~~^~~~~~~~~~~~

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