/in/foo.cc: In function 'int main()':
/in/foo.cc:14:13: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if(j%4==0&&j%100!=0||j%400==0) cnt++;
       ~~~~~~^~~~~~~~~~
/in/foo.cc:6:7: warning: variable 'a' set but not used [-Wunused-but-set-variable]
  int *a;
       ^