View Compilation Error

0_0_39540909_19623.cpp: In function 'bool check(int, std::vector<std::vector<int> >&, std::vector<int>)':
0_0_39540909_19623.cpp:50:13: error: 'xx' was not declared in this scope; did you mean 'x'?
   50 |             xx++;
      |             ^~
      |             x
0_0_39540909_19623.cpp:55:13: error: 'yy' was not declared in this scope; did you mean 'y'?
   55 |             yy++;
      |             ^~
      |             y