class Solution:
   def solve(self, matrix, target):
      col = len(matrix[0]) - 1
      for i in range(len(matrix)):
         while matrix[i][col] > target and col >= 0:
            col = col - 1
         if matrix[i][col] == target:
            return True
      return False
ob = Solution()
matrix = [ [2, 4, 30], [3, 4, 31], [6, 6, 32] ]
target = 31
print(ob.solve(matrix, target))

matrix = [
[2, 4, 30],
[3, 4, 31],
[6, 6, 32]]
target = 31

True