Fix matrix binary search at row starts

Author: sean0407

matrix/binary_search_matrix.py

@@ -43,7 +43,7 @@ def mat_bin_search(value: int, matrix: list) -> list:
     index = 0
     if matrix[index][0] == value:
         return [index, 0]
-    while index < len(matrix) and matrix[index][0] < value:
+    while index < len(matrix) and matrix[index][0] <= value:
         r = binary_search(matrix[index], 0, len(matrix[index]) - 1, value)
         if r != -1:
             return [index, r]