View Compilation Error

0_0_39363620_7038.cpp: In function 'void initialize()':
0_0_39363620_7038.cpp:34:9: error: 'sort' was not declared in this scope; did you mean 'short'?
   34 |         sort(positions, positions + cnt);
      |         ^~~~
      |         short
0_0_39363620_7038.cpp:35:15: error: 'unique' was not declared in this scope
   35 |         cnt = unique(positions, positions + cnt) - positions;
      |               ^~~~~~