View Compilation Error

0_0_21813339_4189.cpp: In function 'int main()':
0_0_21813339_4189.cpp:20:23: error: 'strlen' was not declared in this scope
     glen = strlen(goal);
                       ^
0_0_21813339_4189.cpp:21:14: error: 'S' was not declared in this scope
     while(S(n)!=EOF)
              ^
0_0_21813339_4189.cpp:21:17: error: 'EOF' was not declared in this scope
     while(S(n)!=EOF)
                 ^
0_0_21813339_4189.cpp:24:19: error: 'SS' was not declared in this scope
             SS(str);len = strlen(str);
                   ^
0_0_21813339_4189.cpp:26:27: error: 'printf' was not declared in this scope
             printf("YES\n");
                           ^
0_0_21813339_4189.cpp:28:26: error: 'printf' was not declared in this scope
             printf("NO\n");
                          ^