foo.cc: In function 'int main()':
foo.cc:13:12: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   13 |   if(i%4==0&&i%100!=0||i%400==0)
      |      ~~~~~~^~~~~~~~~~
foo.cc:19:19: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   19 |    if(i==2&&a%4==0&&a%100!=0||i==2&&a%400==0)
      |       ~~~~~~~~~~~~^~~~~~~~~~
foo.cc:25:19: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   25 |    if(i==2&&x%4==0&&x%100!=0||i==2&&x%400==0)
      |       ~~~~~~~~~~~~^~~~~~~~~~
foo.cc:45:19: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   45 |    if(i==2&&a%4==0&&a%100!=0||i==2&&a%400==0)
      |       ~~~~~~~~~~~~^~~~~~~~~~
foo.cc:53:20: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   53 |     if(i==2&&a%4==0&&a%100!=0||i==2&&a%400==0)
      |        ~~~~~~~~~~~~^~~~~~~~~~
foo.cc:59:20: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   59 |     if(b==2&&a%4==0&&a%100!=0||b==2&&a%400==0)
      |        ~~~~~~~~~~~~^~~~~~~~~~
foo.cc:63:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   63 |      if(y==2&&x%4==0&&x%100!=0||y==2&&x%400==0)
      |         ~~~~~~~~~~~~^~~~~~~~~~

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