/in/foo.cc: In function 'int rn(int)':
/in/foo.cc:12:11: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   12 |  if(y%4==0&&y%100!=0||y%400==0) return 1;
      |     ~~~~~~^~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:37:18: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   37 |    while(sum>=365&&rn(yr+1)==0||sum>=366&&rn(yr+1)==1){
      |          ~~~~~~~~^~~~~~~~~~~~~