Leetcode Problem 1674. Minimum Moves to Make Array Complementary

1674. Minimum Moves to Make Array Complementary

Leetcode Solutions

Prefix Sum and Difference Array Approach

  1. Initialize a difference array delta with a size of 2 * limit + 2 to zero.
  2. Iterate over the first half of the nums array to consider pairs (A, B).
  3. Update the difference array delta based on the number of operations needed:
    • Add 2 operations for target sum 2.
    • Subtract 1 operation for target sum min(A, B) + 1 and A + B.
    • Add 1 operation for target sum A + B + 1 and max(A, B) + limit + 1.
  4. Initialize curr to 0 and res to infinity.
  5. Iterate over the possible target sums from 2 to 2 * limit + 1.
    • Update curr by adding the value of delta at the current target sum.
    • Update res to the minimum of res and curr.
  6. Return res as the minimum number of moves required.
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Binary Search Approach

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