View Compilation Error

0_0_25679900_25165.cpp:5:1: error: 'll' does not name a type
 ll get(int s, int t) {
 ^
0_0_25679900_25165.cpp: In function 'int main()':
0_0_25679900_25165.cpp:13:19: error: 'scanf' was not declared in this scope
     scanf("%d", &T);
                   ^
0_0_25679900_25165.cpp:37:40: error: 'get' was not declared in this scope
             printf("%lld\n", get(x1, y1) - get(x1, y0 - 1) - get(x0 - 1, y1) + get(x0 - 1, y0 - 1));
                                        ^
0_0_25679900_25165.cpp:37:99: error: 'printf' was not declared in this scope
             printf("%lld\n", get(x1, y1) - get(x1, y0 - 1) - get(x0 - 1, y1) + get(x0 - 1, y0 - 1));
                                                                                                   ^