foo.cc: In function 'int isLeapYear(int)':
foo.cc:25:19: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   25 |  return year%4==0 && year%100!=0 || year%400==0;
      |         ~~~~~~~~~~^~~~~~~~~~~~~~
foo.cc: In function 'int Year1_Year2(int, int, int, int, int, int)':
foo.cc:53:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   53 |  for(int i=year1+1;i<=year2-1;i++)
      |  ^~~
foo.cc:55:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   55 |   return sum;
      |   ^~~~~~
foo.cc: In function 'void print(int, int)':
foo.cc:66:43: warning: unused variable 'num' [-Wunused-variable]
   66 |  int cnt=weekdayOfTheFirstDay(year,month),num;
      |                                           ^~~

[Hydro](https://hydro.ac)提供评测服务