蟠桃记 Time Limit: 1000 ms Memory Limit: 65536 KiB
2018-03-29 20:04
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Submit Statistic
输入以0结束。
22
Problem Description
孙悟空在大闹蟠桃园的时候,第一天吃掉了所有桃子总数一半多一个,第二天又将剩下的桃子吃掉一半多一个,以后每天吃掉前一天剩下的一半多一个,到第n天准备吃的时候只剩下一个桃子。这下可把神仙们心疼坏了,请帮忙计算一下,第一天开始吃的时候一共有多少个桃子?Input
输入数据有多组,每组占一行,包含一个正整数n(1≤n≤30),表示只剩下一个桃子的时候是在第n天发生的。输入以0结束。
Output
对于每组输入数据,输出第一天开始吃的时候桃子的总数,每个测试实例占一行。Sample Input
2 4 0
Sample Output
422
#include <stdio.h> #include <stdlib.h> int main() { long long int a[9999]; int n,i; while(scanf("%d",&n)!=EOF) { if(n==0) { break; } a[1]=1; for(i=2;i<=n;i++) { a[i]=(a[i-1]+1)*2; } printf("%lld\n",a ); } return 0; }
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