2070 Fibbonacci Number
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http://acm.hdu.edu.cn/showproblem.php?pid=2070
Fibbonacci Number
Time Limit: 1000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 13386 Accepted Submission(s): 6675
Problem Description
Your objective for this question is to develop a program which will generate a fibbonacci number. The fibbonacci function is defined as such:
f(0) = 0
f(1) = 1
f(n) = f(n-1) + f(n-2)
Your program should be able to handle values of n in the range 0 to 50.
f(0) = 0
f(1) = 1
f(n) = f(n-1) + f(n-2)
Your program should be able to handle values of n in the range 0 to 50.
Input
Each test case consists of one integer n in a single line where 0≤n≤50. The input is terminated by -1.
Output
Print out the answer in a single line for each test case.
Sample Input
345-1
Sample Output
235you can use 64bit integer: __int64HintNote:
用递归和普通方法会超时,需要先打表
#include<stdio.h>__int64 a[51];int main(){ int i; for(i=2,a[0]=0,a[1]=1;i<=51;i++) a[i]=a[i-1]+a[i-2]; int n; while(scanf("%d",&n)&&n!=-1) { printf("%I64d\n",a[n]); } return 0;}
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