View Compilation Error

0_0_30199353_25458.cpp: In constructor 'Matrix::Matrix()':
0_0_30199353_25458.cpp:5:35: error: 'memset' was not declared in this scope
   Matrix() { memset(a, 0, sizeof a); }
                                   ^
0_0_30199353_25458.cpp: In function 'int main()':
0_0_30199353_25458.cpp:30:21: error: 'scanf' was not declared in this scope
  int t;scanf("%d",&t);
                     ^
0_0_30199353_25458.cpp:32:16: error: 'read' was not declared in this scope
   int n = read(),a;
                ^
0_0_30199353_25458.cpp:36:5: error: 'a' was not declared in this scope
     a=ans.a[1][1]%mod;
     ^
0_0_30199353_25458.cpp:38:20: error: 'printf' was not declared in this scope
     printf("%d\n",a);
                    ^