【HDU 5914 Sequence I】+ 2016中国大学生程序设计竞赛（长春）-重现赛

Triangle
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)
Total Submission(s): 767 Accepted Submission(s): 492

Problem Description
Mr. Frog has n sticks, whose lengths are 1,2, 3⋯n respectively. Wallice is a bad man, so he does not want Mr. Frog to form a triangle with three of the sticks here. He decides to steal some sticks! Output the minimal number of sticks he should steal so that Mr. Frog cannot form a triangle with
any three of the remaining sticks.

Input
The first line contains only one integer T (T≤20), which indicates the number of test cases.

For each test case, there is only one line describing the given integer n (1≤n≤20).

Output
For each test case, output one line “Case #x: y”, where x is the case number (starting from 1), y is the minimal number of sticks Wallice should steal.

Sample Input

3
4
5
6

Sample Output

Case #1: 1
Case #2: 1
Case #3: 2

最大的两边~小于a且加入a后最大的两边仍然小于等于 N时a便可以留下~~
本菜鸡手推~~

AC代码 :

int pa[21] = {0,0,0,0,1,1,2,3,3,4,5,6,7,7,8,9,10,11,12,13,14};
int main()
{
    int T,n,nl = 0;
    scanf("%d",&T);
    while(T--){
      scanf("%d",&n);
       printf("Case #%d: %d\n",++nl,pa[n]);
    }
    return 0;
}