View Compilation Error

0_0_22196096_32245.cpp: In function 'int main()':
0_0_22196096_32245.cpp:30:26: error: 'memset' was not declared in this scope
   memset(T,0,sizeof(T[0]));
                          ^
0_0_22196096_32245.cpp:36:22: error: 'strlen' was not declared in this scope
    len = strlen(str+1);
                      ^