HDU 1405
题意:
输入一个数n,输出它的素因子与这个素因子出现的次数.
分析:
用欧拉函数,变下形就好了,不再过多解释.
代码如下:
#include <iostream>
#include <cstdio>
#include <cstring>
#include <fstream>
#include <ctime>
#include <cmath>
#include <cstdlib>
#include <algorithm>
#include <set>
#include <map>
#include <list>
#include <stack>
#include <queue>
#include <iterator>
#include <vector> using namespace std; #define LL long long
#define INF 0x3f3f3f3f
#define MOD 1000000007
#define MAXN 10000010
#define MAXM 1000010 const int maxn = ;
int a[maxn]; void euler_phi(int n)
{
int m = (int)sqrt(n+0.5);
//int ans = n;
for(int i = ; i <= m; i++ )
if(n%i==)
{
//ans = ans/i*(i-1);
while(n%i==)
{
a[i]++;
n /= i;
}
}
if(n > )
a[n]++;
// ans = ans/n*(n-1);
// return ans;
} int main()
{
int n;
int kase = ;
while(scanf("%d", &n)==&&n>=)
{
if(kase)
printf("\n");
memset(a, , sizeof(a));
euler_phi(n);
printf("Case %d.\n", ++kase);
for(int i = ; i <= n; i++ )
if(a[i])
printf("%d %d ", i, a[i]);
printf("\n");
} return ;
}
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