Leetcode Problem 2174. Remove All Ones With Row and Column Flips II

2174. Remove All Ones With Row and Column Flips II

Leetcode Solutions

Backtracking with Set

  1. Initialize a global variable ans to infinity to store the minimum number of flips required.
  2. Initialize a global variable flips to 0 to keep track of the current number of flips.
  3. Define a recursive helper function that will perform the backtracking.
  4. In the helper function, iterate over all cells of the grid.
  5. If a cell contains a 1 and its row and column have not been flipped yet, add the row and column to the set and increment flips.
  6. Recursively call the helper function to continue the process.
  7. After the recursive call, backtrack by decrementing flips and removing the row and column from the set.
  8. If no cell with a 1 is found during the iteration, update ans with the minimum of ans and flips.
  9. Call the helper function initially and return the value of ans.
UML Thumbnail

DFS with Bitmasking and Memoization

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