Leetcode Problem 1787. Make the XOR of All Segments Equal to Zero

1787. Make the XOR of All Segments Equal to Zero

Leetcode Solutions

Dynamic Programming with XOR and Frequency Count

  1. Initialize a 2D DP array dp with dimensions k x 1024 (since numbers are less than 2^10) and set all values to a large number (e.g., n+1), except dp[0][0] which is set to 0.
  2. Create a frequency array freq to count the occurrences of each number at each position modulo k.
  3. Iterate over each position i from 0 to k-1.
  4. For each position i, calculate the total number of elements in the set S[i].
  5. For each possible XOR value j from 0 to 1023, calculate the minimum number of changes required if we change the current element to one of the elements in the set S[i] or to any other number to achieve the XOR value j.
  6. Update the DP array with the minimum number of changes for each XOR value j.
  7. After filling the DP array, return dp[k-1][0] as the answer.
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Greedy Approach with Frequency Count and XOR Properties

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