View Compilation Error

0_0_26297378_16238.cpp: In function 'void Solve()':
0_0_26297378_16238.cpp:23:35: error: 'memset' was not declared in this scope
         memset(Hash,0,sizeof(Hash));
                                   ^
0_0_26297378_16238.cpp:24:22: error: 'strlen' was not declared in this scope
         end=strlen(St);
                      ^