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https://codeforces.com/contest/1549/submission/186542539 (Runtime Error on Test 5)
Size of self._lazy and self._data is too small, as seen in the runtime error submission (array index out of bounds)
Changed size from (2 * _size) to (4 * _size)
https://codeforces.com/contest/1549/submission/186543644 (Updated submission ACs after increasing size)