View Compilation Error

0_0_21769639_3300.cpp: In member function 'void Edge::init()':
0_0_21769639_3300.cpp:24:30: error: 'memset' was not declared in this scope
   memset(head,-1,sizeof(head));
                              ^
0_0_21769639_3300.cpp: In member function 'bool Edge::bfs(int, int)':
0_0_21769639_3300.cpp:36:31: error: 'memset' was not declared in this scope
   memset(deep,inf,sizeof(deep));
                               ^
0_0_21769639_3300.cpp: In function 'int main()':
0_0_21769639_3300.cpp:111:19: error: 'strlen' was not declared in this scope
     len = strlen(s);
                   ^