Seven_Training

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zoj 2330

#include <iostream>
#include <cmath>
#include <cstdio>
#include <cstring>
using namespace std;
#define inc 1e-7
#define e exp(1.0)

double n;
double f(double x)
{
    return x/log(x)-n/log(n);
}
void binary(double a)
{
    double l=e+inc,r=10000.0,mid;
    if(n-e>inc)
    {
        printf("-1\n");
        return ;
    }
    while(r-l>inc)
    {
        mid=(l+r)/2;
        if(f(l)*f(mid)<0)
           r=mid;
        else
         l=mid;
    }
    printf("%.5f\n",mid);
}
int main()
{
    while(~scanf("%lf",&n))
    {
        binary(n);
    }
    return 0;
}

#include <iostream>
#include <cmath>
#include <cstdio>
#include <cstring>
using namespace std;
#define M 500002
int a[M];
void get()
{
    int i,j;
    for( i = 1 ; i <=250000; i ++ )
        for ( j = 2 ; i*j <= 500000 ; j ++ )//将所有含因数i的数i*j均加上i
             a[i*j] += i;
}
int main()
{
    int T;
    int n,ans;
    //freopen("o.txt","w",stdout);
    cin>>T;
    get();
    while(T--)
    {
        scanf("%d",&n);
        printf("%d\n",a[n]);
    }

return 0;
}