猴子第一天摘下若干个桃子，当即吃了一半，还不过瘾，又多吃了一个。第二天早上又将剩下的桃子吃掉了一半，又多吃了一个。以后每天早上都吃了前一天剩下的一半零一个。到第十天早上想再吃时，见只剩下一个桃子了。求第一天共摘了多少个桃子。c++，逆向思维。-Monkey off his first day of a number of peach, half eaten immediately, not good enough, and eat one. The next morning in turn eaten by the remaining peach half, then eat one. After the morning before the rest of the day to eat a half a zero. When the tenth day in the morning want to eat, see only one peach. Seeking first day total of how many pick peaches. c++, reverse thinking