- 研发工程师Java岗笔试题
- 3.19
第一题:给定n(n为偶数)个人,规定每个人可以得到一个a[i]的序号,若抽到的序号是某个数字的平方,则获奖,现有一种修改券,可以使自己抽到的序号增减一,每个人可以使用多张,问最少需要多少张修改券可以使获奖人数为一半。
输入: 4 4 7 12 13
输出 : 2
说明: 该序号数组中,4是2的2次幂,7需要两张修改券,所以至少需要两张
题解Java:
public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int n = scanner.nextInt(); int[] nums = new int[n]; for (int i = 0; i < n; i++) { int num = scanner.nextInt(); int s = help(num); nums[i] = s; } int left, right, tem; //冒泡排序 for (int j = 0; j < n - 1; j++) { for (int i = 0; i < n - 1; i++) { left = nums[i]; right = nums[i + 1]; if (left >= right) { tem = right; nums[i + 1] = left; nums[i] = tem; } } } System.out.println(Arrays.toString(nums)); int rs = 0; for (int i = 0; i <= (n / 2) - 1; i++) { rs = nums[i] + rs; } System.out.println(rs); } //返回最小奖券数 private static int help(int a) { int pre = 1, post = 1; int n = 1; int mul; do { mul = n * n; if (a == mul) return 0; pre = n; post = ++n; }while ((mul = n*n) <= a); return Math.min((a - (n-1)*(n-1)),mul - a); } }
全部评论
(2) 回帖