Cumsum2D = ref object
  B: seq[seq[int]]
  H: int
  W: int

CPLIB_UTILS_CUMSUM2D = 1

proc query(self: Cumsum2D; il, ir, jl, jr: int): int {....raises: [], tags: [].}

proc toCumSum2D(X: openArray[seq[int]]): Cumsum2D {....raises: [], tags: [].}