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Code_11_MaxGap.java
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98 lines (89 loc) · 2.26 KB
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package main.code.array.sort;
import java.util.Arrays;
public class Code_11_MaxGap {
public static int maxGap(int[] nums) {
if (nums == null || nums.length < 2) {
return 0;
}
int len = nums.length;
int min = Integer.MAX_VALUE;
int max = Integer.MIN_VALUE;
for (int i = 0; i < len; i++) {
min = Math.min(min, nums[i]);
max = Math.max(max, nums[i]);
}
if (min == max) {
return 0;
}
boolean[] hasNum = new boolean[len + 1];
int[] maxs = new int[len + 1];
int[] mins = new int[len + 1];
int bid = 0;
for (int i = 0; i < len; i++) {
bid = bucket(nums[i], len, min, max);
mins[bid] = hasNum[bid] ? Math.min(mins[bid], nums[i]) : nums[i];
maxs[bid] = hasNum[bid] ? Math.max(maxs[bid], nums[i]) : nums[i];
hasNum[bid] = true;
}
int res = 0;
int lastMax = maxs[0];
int i = 1;
for (; i <= len; i++) {
if (hasNum[i]) {
res = Math.max(res, mins[i] - lastMax);
lastMax = maxs[i];
}
}
return res;
}
public static int bucket(long num, long len, long min, long max) {
return (int) ((num - min) * len / (max - min));
}
// for test
public static int comparator(int[] nums) {
if (nums == null || nums.length < 2) {
return 0;
}
Arrays.sort(nums);
int gap = Integer.MIN_VALUE;
for (int i = 1; i < nums.length; i++) {
gap = Math.max(nums[i] - nums[i - 1], gap);
}
return gap;
}
// for test
public static int[] generateRandomArray(int maxSize, int maxValue) {
int[] arr = new int[(int) ((maxSize + 1) * Math.random())];
for (int i = 0; i < arr.length; i++) {
arr[i] = (int) ((maxValue + 1) * Math.random()) - (int) (maxValue * Math.random());
}
return arr;
}
// for test
public static int[] copyArray(int[] arr) {
if (arr == null) {
return null;
}
int[] res = new int[arr.length];
for (int i = 0; i < arr.length; i++) {
res[i] = arr[i];
}
return res;
}
// for test
public static void main(String[] args) {
int testTime = 500000;
int maxSize = 100;
int maxValue = 100;
boolean succeed = true;
for (int i = 0; i < testTime; i++) {
int[] arr1 = generateRandomArray(maxSize, maxValue);
int[] arr2 = copyArray(arr1);
if (maxGap(arr1) != comparator(arr2)) {
succeed = false;
break;
}
}
System.out.println(succeed ? "Nice!" : "Fucking fucked!");
}
}