View Compilation Error

0_0_20138347_6609.cpp: In function 'int main()':
0_0_20138347_6609.cpp:14:29: error: 'memset' was not declared in this scope
   memset(num, 0, sizeof(num));
                             ^
0_0_20138347_6609.cpp:20:34: error: 'strcmp' was not declared in this scope
     if (strcmp(color[i], color[j]) == 0)
                                  ^
0_0_20138347_6609.cpp:25:29: error: 'strcpy' was not declared in this scope
     strcpy(name[k], color[i]);
                             ^
0_0_20138347_6609.cpp:33:33: error: 'strcmp' was not declared in this scope
     if (strcmp(color[j], name[i]) == 0)
                                 ^