HDOJ 1406 完数(击表，附讨论区出现的史上最牛逼打表，0ms)
HDOJ 1406 完数(打表，附讨论区出现的史上最牛逼打表，0ms)
完数
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 22197 Accepted Submission(s): 8115
Problem Description
完数的定义：如果一个大于1的正整数的所有因子之和等于它的本身，则称这个数是完数，比如6，28都是完数：6=1+2+3；28=1+2+4+7+14。
本题的任务是判断两个正整数之间完数的个数。
本题的任务是判断两个正整数之间完数的个数。
Input
输入数据包含多行，第一行是一个正整数n，表示测试实例的个数，然后就是n个测试实例，每个实例占一行，由两个正整数num1和num2组成,(1<num1,num2<10000) 。
Output
对于每组测试数据，请输出num1和num2之间（包括num1和num2）存在的完数个数。
Sample Input
2 2 5 5 7
Sample Output
0 1
题目水爆，打表水过，注意n，m的大小就行了，杭电就是这么坑。
代码如下：
#include<cstdio>
#include<cstring>
int a[10010];
int main()
{
int n,m,t,i,sum,j;
memset(a,0,sizeof(a));
for(i=2;i<10002;i++)
{
sum=1;
a[i]=a[i-1];
for(j=2;j<=(i/2);j++)
{
if(i%j==0)
sum=sum+j;
}
if(sum==i)
a[i]++;
}
scanf("%d",&t);
while(t--)
{
scanf("%d%d",&n,&m);
if(n>m)
printf("%d\n",a[n]-a[m-1]);
else
printf("%d\n",a[m]-a[n-1]);
}
return 0;
}等等还没结束，爱逛讨论区，发现10000之内的完数就4个{6,28，496，8128}，
于是讨论区沾出了下面神级代码：
史上最牛逼打表：
#include <iostream>
#include <stdio.h>
using namespace std;
int main()
{
int 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0,0,0,0,0,0};
int cyc;
cin>>cyc;
while(cyc--)
{
int left,right;
cin>>left>>right;
if(left>right)
{
swap(left,right);
}
int res=0;
for(int i=left;i<=right;i++)
{
res+=result[i]==1?1:0;
}
cout<<res<<endl;
}
return 0;
}
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