View Compilation Error

0_0_19215042_18634.cpp: In function 'int main()':
0_0_19215042_18634.cpp:11:20: error: 'gets' was not declared in this scope
     while (gets(buf)) {
                    ^
0_0_19215042_18634.cpp:14:43: error: 'puts' was not declared in this scope
                 if (ret == 0) puts("None.");
                                           ^
0_0_19215042_18634.cpp:20:47: error: 'printf' was not declared in this scope
                     printf("%d %d\n", ret, cnt);
                                               ^
0_0_19215042_18634.cpp:26:53: error: 'sscanf' was not declared in this scope
         sscanf(buf, "%d%d%d", &X[id], &Y[id], &Z[id]);
                                                     ^
0_0_19215042_18634.cpp:32:35: error: 'puts' was not declared in this scope
         if (ret == 0) puts("None.");
                                   ^
0_0_19215042_18634.cpp:38:39: error: 'printf' was not declared in this scope
             printf("%d %d\n", ret, cnt);
                                       ^