When clicking the backward and forward buttons for the application, we won't be adding new events to the stack but we will be moving the pointer within the stack.
单击应用程序的后退和前进按钮时，不会在堆栈中添加新的事件，而是移动堆栈的指针。
So, the way you construct an LCS is by starting in the lower-right corner cell and then following the pointer arrows backward.
所以，构建LCS的途径就是从右下角的单元格开始，沿着箭头一路返回。
This function moves the file pointer from its current position to a new position, forward or backward, specified by the number of bytes.
整个函数将文件指针从当前位置向前或向后移动移动到一个新的位置。
This function moves the file pointer from its current position to a new position, forward or backward, specified by the number of bytes.
整个函数将文件指针从当前位置向前或向后移动移动到一个新的位置。
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