/in/foo.cc: In function 'int main()':
/in/foo.cc:45:19: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
             if(i+j-1&1)
                ~~~^~
/in/foo.cc:55:31: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
                 if(j&1) ans+=k-2>>1;
                              ~^~
/in/foo.cc:56:28: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
                 else ans+=k-1>>1;
                           ~^~