北京邀请赛 B. Beautiful Garden

题意：给你坐标和n个点，求最少移动的点使得n个点成等差数列

思路：既然要成等差数列，那么最起码有两个点是不动的，然后枚举这两个点中间的点的个数，近期水的要死，看了队友的代码做的

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cstdlib>
#include <cmath>
using namespace std;
const double eps = 1e-9;
const int INF = 0x3f3f3f3f;

int n;
double x[45];

int main() {
	int cas = 1,t;
	scanf("%d", &t);
	while (t--) {
		scanf("%d", &n);
		for (int i = 0; i < n; i++)
			scanf("%lf", &x[i]);
		sort(x, x+n);
		printf("Case #%d: ", cas++);
		if (n == 1){
			printf("0\n");
			continue;
		}
		int ans = INF;
		for (int i = 0; i < n; i++)
			for (int j = i+1; j < n; j++)
				for (int k = 1; k < n; k++) {
					int count = 0;
					double d = (x[j]-x[i])/k;
					double cur = x[i]-d;
					int cnt = 0;
					for (int l = 0; l < n; l++) {
						cur += d;
						while (x[cnt] < cur && cnt < n)
							cnt++;
						if (cnt == n)
							break;
						if (fabs(cur-x[cnt]) < eps) {
							count++;
							cnt++;
						}
					}
					ans = min(ans, n-count);
				}
		printf("%d\n", ans);
	}
	return 0;
}