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