/in/foo.cc: In function 'long long int mc(int, int)':
/in/foo.cc:9:15: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
         if(b&1!=0)
              ~^~~
/in/foo.cc:9:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
         if(b&1!=0)
         ^~
/in/foo.cc:11:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
             base=((base%998244353)*(base%998244353))%998244353;
             ^~~~