View Compilation Error

0_0_13871528_26332.cpp: In function 'int main()':
0_0_13871528_26332.cpp:28:31: error: 'memset' was not declared in this scope
   memset(first,0,sizeof(first)); memset(first0,0,sizeof(first0)); mem = pool;
                               ^
0_0_13871528_26332.cpp:31:20: error: 'strlen' was not declared in this scope
    len = strlen(buf);
                    ^