View Compilation Error

0_0_30433129_26470.cpp: In function 'void kmp(char*, int*)':
0_0_30433129_26470.cpp:10:20: error: 'strlen' was not declared in this scope
  int len = strlen(s);
                    ^
0_0_30433129_26470.cpp: In function 'int main()':
0_0_30433129_26470.cpp:27:25: error: 'memset' was not declared in this scope
   memset(n, 0, sizeof(n));
                         ^