/in/foo.cc: In function 'int main()':
/in/foo.cc:6:18: warning: right operand of comma operator has no effect [-Wunused-value]
  cin>>year1,year2; 
                  ^
/in/foo.cc:5:12: warning: 'year2' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int year1,year2,cnt=0,x; 
            ^~~~~