解题思路:
需要反向思考
参考代码:
#include <stdio.h> int sum(int count); int main(void) { int day = 0; scanf("%d", &day); printf("%d\n", sum(day)); return 0; } int sum(int count) { int num1 = 1; //记录每天吃的桃子数 while (count-- > 1) num1 = (num1 + 1) * 2; return num1; }
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