View Compilation Error

0_0_38911974_4038.cpp: In function 'int main()':
0_0_38911974_4038.cpp:56:16: error: 'T_data' was not declared in this scope; did you mean 'T_1data'?
   56 |         while (T_data--) {
      |                ^~~~~~
      |                T_1data