foo.cc: In function 'bool cmp(two, two)':
foo.cc:10:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   10 |  return a.h<b.h||a.h==b.h&&a.s>b.s;
      |                  ~~~~~~~~^~~~~~~~~
foo.cc: At global scope:
foo.cc:56:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   56 | main()
      |      ^
foo.cc: In function 'int main()':
foo.cc:58:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   58 |  scanf("%lld",&n);
      |  ~~~~~^~~~~~~~~~~
foo.cc:62:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   62 |   scanf("%lld%lld%lld%lld",&a,&b,&x,&y);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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