foo.cc: In function 'void pd1()':
foo.cc:14:11: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   14 |  if(n%4==0&&n%100!=0||n%400==0&&n%3200!=0)
      |     ~~~~~~^~~~~~~~~~
foo.cc:14:4: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   14 |  if(n%4==0&&n%100!=0||n%400==0&&n%3200!=0)
      |    ^

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