QList<QVector<QPointF>> xx::getAllGroup(QList<QVector<QPointF>> val){

  int oriSize = val.size();

  QVector<int> tempIndexArr(oriSize);

  tempIndexArr[oriSize - 1] = -1;

  QVector<int> tempLengthArr(oriSize);

  for (int i = 0; i < oriSize; i++){

    tempLengthArr[i] = val[i].size();

  }

  QList<QVector<QPointF>> newList;

  bool completeFlag = false;

  while (!completeFlag){

    int changeIndex = val.size() - 1;

    bool isRightIndex = false;

    while (!isRightIndex){

      tempIndexArr[changeIndex] += 1;

      if (tempIndexArr[changeIndex] >= tempLengthArr[changeIndex]){

        if (changeIndex == 0){

          isRightIndex = true;

          completeFlag = true;

        }

        else{

          tempIndexArr[changeIndex--] = 0;

        }

      }

      else{

        isRightIndex = true;

      }

    }

    if (isRightIndex && !completeFlag){

      QVector<QPointF> pointVec;

      for (int i = 0; i != val.size(); i++){

        pointVec.push_back(val[i][tempIndexArr[i]]);

      }

      newList.push_back(pointVec);

    }

  }

  return newList;

}