[单选题]What happens if the FOR loop in the insert() function changes to the following form？x2g答案窝(daanwo.com)-大学生作业答案及考资分享平台
for (int i = r; i < _size; i++) _elem[i + 1] = _elem[i];x2g答案窝(daanwo.com)-大学生作业答案及考资分享平台
ANo problem, just change it from front to back 没有问题，只是改为从前向后移动罢了x2g答案窝(daanwo.com)-大学生作业答案及考资分享平台
BOverwrite all elements in the original vector with rank greater than r 会覆盖原向量中秩大于r的所有元素x2g答案窝(daanwo.com)-大学生作业答案及考资分享平台
COverwrite all elements in the original vector with rank less than r 会覆盖原向量中秩小于r的所有元素x2g答案窝(daanwo.com)-大学生作业答案及考资分享平台
DWill cause vector expansion failure 会引起向量扩容失败