foo.cc: In function 'int isLeapYear(int)':
foo.cc:24:19: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   24 |  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:52:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   52 |  for(int i=year1+1;i<=year2-1;i++)
      |  ^~~
foo.cc:54:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   54 |   return sum;
      |   ^~~~~~

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