/in/foo.cc: In function 'int main()':
/in/foo.cc:6:36: error: too many initializers for 'int [6]'
    6 |         int mon[6]={1,3,5,7,8,10,12};
      |                                    ^
/in/foo.cc:7:29: error: too many initializers for 'int [3]'
    7 |         int moe[3]={4,6,9,11};
      |                             ^
/in/foo.cc:16:38: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   16 |                 }else if(m==2&&y%4==0&&y%100!=0||y%400==0){
      |                          ~~~~~~~~~~~~^~~~~~~~~~