View Compilation Error

0_0_30354791_30086.cpp: In function 'int main()':
0_0_30354791_30086.cpp:5:27: error: 'scanf' was not declared in this scope
  while(scanf("%d %d",&n,&m)!=EOF)
                           ^
0_0_30354791_30086.cpp:5:30: error: 'EOF' was not declared in this scope
  while(scanf("%d %d",&n,&m)!=EOF)
                              ^
0_0_30354791_30086.cpp:8:15: error: 't' was not declared in this scope
   scanf("%d",&t[i]);
               ^
0_0_30354791_30086.cpp:9:14: error: 'build' was not declared in this scope
   build(1,1,n);
              ^
0_0_30354791_30086.cpp:12:18: error: 'getchar' was not declared in this scope
          getchar();
                  ^
0_0_30354791_30086.cpp:16:16: error: 'update' was not declared in this scope
    update(1,l,r);
                ^
0_0_30354791_30086.cpp:18:29: error: 'Query' was not declared in this scope
    printf("%d\n",Query(1,l,r));
                             ^
0_0_30354791_30086.cpp:18:30: error: 'printf' was not declared in this scope
    printf("%d\n",Query(1,l,r));
                              ^