View Compilation Error

0_0_35298482_16180.cpp:58:5: error: 'os' does not name a type
   } os;
     ^
0_0_35298482_16180.cpp:61:15: error: 'Fastio::os' has not been declared
 using Fastio::os;
               ^
0_0_35298482_16180.cpp: In function 'void update(int, int, int)':
0_0_35298482_16180.cpp:118:3: error: 'lazy' was not declared in this scope
   lazy[o]++, seg_t[o]--;
   ^
0_0_35298482_16180.cpp:118:14: error: 'seg_t' was not declared in this scope
   lazy[o]++, seg_t[o]--;
              ^
0_0_35298482_16180.cpp: In function 'int main()':
0_0_35298482_16180.cpp:149:5: error: 'os' was not declared in this scope
     os.println(sum(qr) - sum(ql - 1));
     ^