foo.cc: In function ‘int main()’:
foo.cc:13:38: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   13 |                 if(y%400==0 || y%4==0&&y%100!=0)
      |                                ~~~~~~^~~~~~~~~~
foo.cc:24:38: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   24 |                 if(y%400==0 || y%4==0&&y%100!=0)
      |                                ~~~~~~^~~~~~~~~~
foo.cc:35:38: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   35 |                 if(y%400==0 || y%4==0&&y%100!=0)
      |                                ~~~~~~^~~~~~~~~~
foo.cc:46:34: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   46 |             if(y%400==0 || y%4==0&&y%100!=0)
      |                            ~~~~~~^~~~~~~~~~
foo.cc:57:34: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   57 |             if(y%400==0 || y%4==0&&y%100!=0)
      |                            ~~~~~~^~~~~~~~~~
foo.cc:68:34: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   68 |             if(y%400==0 || y%4==0&&y%100!=0)
      |                            ~~~~~~^~~~~~~~~~
foo.cc:79:34: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   79 |             if(y%400==0 || y%4==0&&y%100!=0)
      |                            ~~~~~~^~~~~~~~~~
foo.cc:90:34: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   90 |             if(y%400==0 || y%4==0&&y%100!=0)
      |                            ~~~~~~^~~~~~~~~~
foo.cc:101:34: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
  101 |             if(y%400==0 || y%4==0&&y%100!=0)
      |                            ~~~~~~^~~~~~~~~~
foo.cc:112:34: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
  112 |             if(y%400==0 || y%4==0&&y%100!=0)
      |                            ~~~~~~^~~~~~~~~~
foo.cc:123:34: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
  123 |             if(y%400==0 || y%4==0&&y%100!=0)
      |                            ~~~~~~^~~~~~~~~~