foo.cc: In function 'int main()':
foo.cc:47:24: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   47 |     if(a%400==0||a%4==0&&a%100!=0) s++;
      |                  ~~~~~~^~~~~~~~~~
foo.cc:48:24: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   48 |     if(b%400==0||b%4==0&&b%100!=0) s++;
      |                  ~~~~~~^~~~~~~~~~

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