HDU 5366

The mook jong

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)
Total Submission(s): 326    Accepted Submission(s): 252

Problem Description
ZJiaQ want to become a strong man, so he decided to play the mook jong。ZJiaQ want to put some mook jongs in his backyard. His backyard consist of n bricks that is 1*1,so it is 1*n。ZJiaQ want to put a mook jong in a brick. because of the hands of the mook jong， the distance of two mook jongs should be equal or more than 2 bricks. Now ZJiaQ want to know how many ways can ZJiaQ put mook jongs legally(at least one mook jong).
 
Input
There ar multiply cases. For each case, there is a single integer n( 1 < = n < = 60)
 
Output
Print the ways in a single line for each case.
 
Sample Input
1
2
3
4
5
6
 
Sample Output
1
2
3
5
8

12

#include <stdio.h>__int64 a[61];int main(){    a[1]=1;    a[2]=2;    a[3]=3;    for(int i=4;i<61;i++)    {        a[i]=a[i-1]+a[i-3]+1;    }    int n;    while(~scanf("%d",&n))    {        printf("%I64d\n",a[n]);    }    return 0;}