foo.cc: In constructor 'Item::Item(int, int)':
foo.cc:14:9: warning: 'Item::num' will be initialized after [-Wreorder]
   14 |     int num;
      |         ^~~
foo.cc:13:9: warning:   'int Item::coef' [-Wreorder]
   13 |     int coef;
      |         ^~~~
foo.cc:16:5: warning:   when initialized here [-Wreorder]
   16 |     Item(int num,int coef):num(num),coef(coef){}
      |     ^~~~

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