USACO Dual Palindromes

  输出N个大于s的满足条件的数, 对于满足条件的数的定义是其2-10进制表示中,至少有两种表示为回文串。。还是暴力:

/*
    ID: m1500293
    LANG: C++
    PROG: dualpal
*/
#include <cstdio>
#include <cstring>
#include <algorithm>

using namespace std;

int a[200], len_a;
int is[100000+100];

int judge()
{
    bool flog = true;
    for(int i=0; i<len_a/2; i++)
        if(a[i] != a[len_a-1-i])
        {
            flog = false;
            break;
        }
    return flog;
}

int pan(int n)  //判断n是否满足条件
{
    int num = 0;
    for(int base=2; base<=10; base++)
    {
        len_a = 0;
        int tp = n;
        while(tp > 0)
        {
            a[len_a++] = tp%base;
            tp /= base;
        }
        if(judge()) num++;
    }
    return num>=2;
}

int main()
{
    freopen("dualpal.in", "r", stdin);
    freopen("dualpal.out", "w", stdout);
    memset(is, 0, sizeof(is));
    for(int i=1; i<=100000; i++)
    {
        if(pan(i)) is[i] = 1;
    }
    int n, s;
    while(scanf("%d%d", &n, &s) == 2)
    {
        int tp = 0;
        for(int i=s+1; tp<n; i++)
        {
            if(is[i])
            {
                printf("%d\n", i);
                tp++;
            }
        }
    }
    return 0;
}

 

posted @ 2015-12-17 22:04  xing-xing  阅读(161)  评论(0编辑  收藏  举报