1619. 删除某些元素后的数组均值

题目

给你一个整数数组 arr ,请你删除最小 5% 的数字和最大 5% 的数字后,剩余数字的平均值。

标准答案 误差在 10-5 的结果都被视为正确结果。

示例1:

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输入:arr = [1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3]
输出:2.00000
解释:删除数组中最大和最小的元素后,所有元素都等于 2,所以平均值为 2 。

示例2:

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输入:arr = [6,2,7,5,1,2,0,3,10,2,5,0,5,5,0,8,7,6,8,0]
输出:4.00000

示例3:

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输入:arr = [6,0,7,0,7,5,7,8,3,4,0,7,8,1,6,8,1,1,2,4,8,1,9,5,4,3,8,5,10,8,6,6,1,0,6,10,8,2,3,4]
输出:4.77778

示例4:

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输入:arr = [9,7,8,7,7,8,4,4,6,8,8,7,6,8,8,9,2,6,0,0,1,10,8,6,3,3,5,1,10,9,0,7,10,0,10,4,1,10,6,9,3,6,0,0,2,7,0,6,7,2,9,7,7,3,0,1,6,1,10,3]
输出:5.27778

示例5:

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输入:arr = [4,8,4,10,0,7,1,3,7,8,8,3,4,1,6,2,1,1,8,0,9,8,0,3,9,10,3,10,1,10,7,3,2,1,4,9,10,7,6,4,0,8,5,1,2,1,6,2,5,0,7,10,9,10,3,7,10,5,8,5,7,6,7,6,10,9,5,10,5,5,7,2,10,7,7,8,2,0,1,1]
输出:5.29167

提示:

  • 20 <= arr.length <= 1000
  • arr.length20倍数
  • 0 <= arr[i] <= 105

解法一:

Java

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public double trimMean(int[] arr) {
Arrays.sort(arr);
int skip = (int) (arr.length * 0.05);
double result = 0.0;
int sum = 0;
for (int i = skip;i < arr.length - skip;i++) {
sum += arr[i];
}

result = sum / (arr.length - 2 * skip + 0.0);
return result;
}
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