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944. Delete Columns to Make Sorted 👎

  • Time: $O(|\texttt{strs[0]}| \cdot n)$
  • Space: $O(1)$
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class Solution {
 public:
  int minDeletionSize(vector<string>& strs) {
    int ans = 0;

    for (int j = 0; j < strs[0].length(); ++j)
      for (int i = 0; i + 1 < strs.size(); ++i)
        if (strs[i][j] > strs[i + 1][j]) {
          ++ans;
          break;
        }

    return ans;
  }
};

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class Solution {
  public int minDeletionSize(String[] strs) {
    int ans = 0;

    for (int j = 0; j < strs[0].length(); ++j)
      for (int i = 0; i + 1 < strs.length; ++i)
        if (strs[i].charAt(j) > strs[i + 1].charAt(j)) {
          ++ans;
          break;
        }

    return ans;
  }
}

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class Solution:
  def minDeletionSize(self, strs: list[str]) -> int:
    ans = 0

    for j in range(len(strs[0])):
      for i in range(len(strs) - 1):
        if strs[i][j] > strs[i + 1][j]:
          ans += 1
          break

    return ans