View Compilation Error

0_0_30471081_79.cpp: In function 'int main()':
0_0_30471081_79.cpp:23:20: error: 'scanf' was not declared in this scope
     scanf("%lld",&t);
                    ^
0_0_30471081_79.cpp:26:31: error: 'memset' was not declared in this scope
         memset(dp,0,sizeof(dp));
                               ^
0_0_30471081_79.cpp:36:50: error: 'printf' was not declared in this scope
             printf("%lld\n",(dp[d]-dp[c]+MOD)%MOD);
                                                  ^