View Compilation Error

0_0_36542715_5293.cpp:1:1: error: 'include' does not name a type
 include<bits/stdc++.h>
 ^
0_0_36542715_5293.cpp: In function 'int main()':
0_0_36542715_5293.cpp:59:35: error: 'stdin' was not declared in this scope
         freopen("input.txt", "r", stdin);
                                   ^
0_0_36542715_5293.cpp:59:40: error: 'freopen' was not declared in this scope
         freopen("input.txt", "r", stdin);
                                        ^
0_0_36542715_5293.cpp:62:23: error: 'scanf' was not declared in this scope
         scanf("%d", &T);
                       ^
0_0_36542715_5293.cpp:68:46: error: 'printf' was not declared in this scope
             printf("%lld\n",calc(r)-calc(l-1));
                                              ^