Leetcode Problem 1622. Fancy Sequence

1622. Fancy Sequence

Leetcode Solutions

Lazy Propagation with Modular Arithmetic

  1. Initialize add and mul to 0 and 1, respectively.
  2. When append(val) is called, adjust val by subtracting add and then multiplying by the modular inverse of mul, and append it to the sequence.
  3. When addAll(inc) is called, increment add by inc.
  4. When multAll(m) is called, multiply mul and add by m.
  5. When getIndex(idx) is called, if idx is out of bounds, return -1. Otherwise, return the value at idx after applying the mul and add operations.
  6. Use modular arithmetic for all operations to ensure results are within the modulo.
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Square Root Decomposition

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