View Compilation Error

0_0_22131636_23234.cpp: In function 'int cal(int, int)':
0_0_22131636_23234.cpp:14:42: error: 'max' was not declared in this scope
         for (int j = y - 1; j >= max(1, L); j--) {
                                          ^
0_0_22131636_23234.cpp:18:21: error: 'max' was not declared in this scope
         L = max(L, l);
                     ^
0_0_22131636_23234.cpp:23:42: error: 'min' was not declared in this scope
         for (int j = y + 1; j <= min(m, R); j++) {
                                          ^
0_0_22131636_23234.cpp:27:21: error: 'min' was not declared in this scope
         R = min(R, r);
                     ^
0_0_22131636_23234.cpp: In function 'int main()':
0_0_22131636_23234.cpp:37:19: error: 'scanf' was not declared in this scope
     scanf("%d", &T);
                   ^
0_0_22131636_23234.cpp:51:39: error: 'printf' was not declared in this scope
         printf("%.9f\n", gg * 1.0 / ss);
                                       ^