View Compilation Error

0_0_33600397_23199.cpp: In function 'void work()':
0_0_33600397_23199.cpp:99:18: error: 'C' was not declared in this scope
     ans=(C(sumw,2)*C(sumr,1)+C(sumw,3))%mo;
                  ^
0_0_33600397_23199.cpp: In function 'int main()':
0_0_33600397_23199.cpp:113:10: error: 'init' was not declared in this scope
     init();
          ^