详细注释public static int getSecondLargest(int[] arr) { int first = Integer.MIN_VALUE; int second = Integer.MIN_VALUE; for (int i = 0; i < arr.length; i++) { if (arr[i] > first) { second = first; first = arr[i]; } else if (arr[i] > second && arr[i] != first) { second = arr[i]; } } return second; }
时间: 2023-02-12 07:34:11 浏览: 55
这是一个 Java 函数,用于在给定整型数组中找到第二大的数。
它首先声明了两个变量 first 和 second,分别初始化为整型的最小值。
然后使用一个循环遍历整个数组。
对于数组中的每一个元素,如果它大于 first,那么将它赋值给 first,并将原先的 first 赋值给 second。
如果它大于 second 但小于 first,那么将它赋值给 second。
最后返回 second 就是第二大的数。
相关问题
int max = Integer.MIN_VALUE; for (int i = 0; i < arr.length; i++) { max = Math.max(max, arr[i]); }
The code above finds the maximum value in an integer array called "arr".
The variable "max" is initialized to the minimum possible integer value using the constant "Integer.MIN_VALUE".
Then, a for loop is used to iterate through each element of the array. The loop starts at index 0 and continues until it reaches the end of the array (arr.length).
In each iteration, the Math.max() method is used to compare the current element of the array with the current maximum value stored in the "max" variable. If the current element is greater than the current maximum value, it becomes the new maximum.
After the loop finishes, the "max" variable holds the maximum value in the array.
写一个c函数复现以下代码 # 求每一列的均值 col_mean = np.mean(temp_arr, axis=0) # 每个元素减去所在列的均值 temp_arr = (temp_arr - col_mean).astype(int) n_largest = max_min_num n_smallest = max_min_num max_values = np.apply_along_axis(lambda x: np.sort(x)[-n_largest:], axis=0, arr=temp_arr) min_values = np.apply_along_axis(lambda x: np.sort(x)[:n_smallest], axis=0, arr=temp_arr) max_mean = np.mean(max_values, axis=0).astype(int) min_mean = np.abs(np.mean(min_values, axis=0)).astype(int) mean = (max_mean + min_mean) // 2
以下是复现上述代码功能的C函数:
```c
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
void compute_mean(int rows, int cols, int temp_arr[rows][cols], int max_min_num) {
int col_mean[cols];
int i, j, k;
int n_largest = max_min_num;
int n_smallest = max_min_num;
int max_values[cols][n_largest];
int min_values[cols][n_smallest];
int max_mean[cols];
int min_mean[cols];
int mean[cols];
// 求每一列的均值
for (j = 0; j < cols; j++) {
int sum = 0;
for (i = 0; i < rows; i++) {
sum += temp_arr[i][j];
}
col_mean[j] = round(1.0 * sum / rows);
}
// 每个元素减去所在列的均值
for (i = 0; i < rows; i++) {
for (j = 0; j < cols; j++) {
temp_arr[i][j] -= col_mean[j];
}
}
// 求每列的最大值
for (j = 0; j < cols; j++) {
for (i = 0; i < rows; i++) {
int val = temp_arr[i][j];
for (k = 0; k < n_largest; k++) {
if (k == 0 || val > max_values[j][k-1]) {
max_values[j][k] = val;
break;
}
}
}
}
// 求每列的最小值
for (j = 0; j < cols; j++) {
for (i = 0; i < rows; i++) {
int val = temp_arr[i][j];
for (k = 0; k < n_smallest; k++) {
if (k == 0 || val < min_values[j][k-1]) {
min_values[j][k] = val;
break;
}
}
}
}
// 求每列最大值的均值
for (j = 0; j < cols; j++) {
int sum = 0;
for (k = 0; k < n_largest; k++) {
sum += max_values[j][k];
}
max_mean[j] = round(1.0 * sum / n_largest);
}
// 求每列最小值的均值的绝对值
for (j = 0; j < cols; j++) {
int sum = 0;
for (k = 0; k < n_smallest; k++) {
sum += min_values[j][k];
}
min_mean[j] = round(fabs(1.0 * sum / n_smallest));
}
// 求每列最大值均值和最小值均值的平均值
for (j = 0; j < cols; j++) {
mean[j] = round(0.5 * (max_mean[j] + min_mean[j]));
}
// 输出结果
printf("col_mean: ");
for (j = 0; j < cols; j++) {
printf("%d ", col_mean[j]);
}
printf("\n");
printf("max_values: ");
for (j = 0; j < cols; j++) {
printf("[ ");
for (k = 0; k < n_largest; k++) {
printf("%d ", max_values[j][k]);
}
printf("] ");
}
printf("\n");
printf("min_values: ");
for (j = 0; j < cols; j++) {
printf("[ ");
for (k = 0; k < n_smallest; k++) {
printf("%d ", min_values[j][k]);
}
printf("] ");
}
printf("\n");
printf("max_mean: ");
for (j = 0; j < cols; j++) {
printf("%d ", max_mean[j]);
}
printf("\n");
printf("min_mean: ");
for (j = 0; j < cols; j++) {
printf("%d ", min_mean[j]);
}
printf("\n");
printf("mean: ");
for (j = 0; j < cols; j++) {
printf("%d ", mean[j]);
}
printf("\n");
}
```
假设输入的数据存储在一个二维数组 `temp_arr` 中,其大小为 `rows` 行 `cols` 列。函数的第二个参数 `max_min_num` 表示求每列的最大值和最小值时,分别选取的个数。函数会依次输出 `col_mean`,`max_values`,`min_values`,`max_mean`,`min_mean` 和 `mean`,分别对应上述代码中的变量。
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