comefrom: <doocs>0378.Kth Smallest Element in a Sorted Matrix_1.py
code: def check(matrix, mid, k, n):
      count = 0
      i, j = n - 1, 0
      while i >= 0 and j < n:
          if matrix[i][j] <= mid:
              count += i + 1
              j += 1
          else:
              i -= 1
      return count >= k
masked: def sample_funcname ( var_0 , var_1 , var_2 , var_3 ) :
      var_5 = 0
      var_7 , var_8 = var_3 - 1 , 0
      while var_7 >= 0 and var_8 < var_3 :
          if var_0 [ var_7 ] [ var_8 ] <= var_1 :
              var_5 += var_7 + 1
              var_8 += 1
          else :
              var_7 -= 1
      return var_5 >= var_2
  