View Compilation Error

0_0_32335010_21613.cpp: In function 'int main()':
0_0_32335010_21613.cpp:11:19: error: 'scanf' was not declared in this scope
     scanf("%d", &T);
                   ^
0_0_32335010_21613.cpp:17:30: error: 'memset' was not declared in this scope
         memset(g, 0, sizeof g);
                              ^
0_0_32335010_21613.cpp:36:27: error: 'printf' was not declared in this scope
         printf("%d\n", ans);
                           ^