/in/foo.cc: In function 'int main()':
/in/foo.cc:26:20: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     if (j % 4 == 0 && j % 100 != 0 || j % 400 == 0)
         ~~~~~~~~~~~^~~~~~~~~~~~~~~
/in/foo.cc:35:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if (p[i].year % 4 == 0 && p[i].year % 100 != 0 || p[i].year % 400 == 0)
        ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~