View Compilation Error

0_0_29960636_15930.cpp: In function 'int main()':
0_0_29960636_15930.cpp:40:34: error: 'memset' was not declared in this scope
         memset(now, 0, sizeof now);
                                  ^
0_0_29960636_15930.cpp:49:21: error: 'strlen' was not declared in this scope
         len=strlen(s);
                     ^