poj1218

简单题

#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <cstring>
using namespace std;

#define maxn 105

bool unlocked[maxn];

int main()
{
    int t;
    scanf("%d", &t);
    while (t--)
    {
        memset(unlocked, 0, sizeof(unlocked));
        int n;
        scanf("%d", &n);
        for (int i = 1; i <= n; i++)
            for (int j = i; j <= n; j += i)
                unlocked[j] = !unlocked[j];
        int ans = 0;
        for (int i = 1; i <= n; i++)
            if (unlocked[i])
                ans++;
        printf("%d\n", ans);
    }
    return 0;
}