Problem Description
A positive integer x can represent as (a1a2…akak…a2a1)10 or (a1a2…ak−1akak−1…a2a1)10 of a 10-based notational system, we always call x is a Palindrome Number. If it satisfies 0<a1<a2<…<ak≤9, we call x is a Beautiful Palindrome Number.
Now, we want to know how many Beautiful Palindrome Numbers are between 1 and 10N.
Input
The first line in the input file is an integer T(1≤T≤7), indicating the number of test cases.
Then T lines follow, each line represent an integer N(0≤N≤6).
Output
For each test case, output the number of Beautiful Palindrome Number.
Sample Input
2
1
6
Sample Output
9
258
要求判断范围内有多少回文串。由于范围小,可以直接打表计算。
#include int main() { int a[7]={1,9,18,54,90,174,258},t,n; scanf("%d",&t); while(t--) { scanf("%d",&n); printf("%dn",a[n]); } return 0; }
授权协议:创作共用 署名-非商业性使用 2.5 中国大陆
除注明外,本站文章均为原创;转载时请保留上述链接。