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leecode更新

This commit is contained in:
markilue 2023-05-11 13:47:20 +08:00
parent e2d2f8925f
commit 2345b12dde
5 changed files with 216 additions and 3 deletions
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59
Leecode/src/main/java/com/markilue/leecode/hot100/interviewHot/listnode/LC_83_DeleteDuplicates.java Normal file
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@ -0,0 +1,59 @@
package com.markilue.leecode.hot100.interviewHot.listnode;
import com.markilue.leecode.listnode.ListNode;
/**
*@BelongsProject: Leecode
*@BelongsPackage: com.markilue.leecode.hot100.interviewHot.listnode
*@Author: markilue
*@CreateTime: 2023-05-11 11:26
*@Description: TODO 力扣83 删除排序链表中的重复元素:重复的留一个
*@Version: 1.0
*/
public class LC_83_DeleteDuplicates {
//一个一个删
public ListNode deleteDuplicates(ListNode head) {
if (head == null) {
return head;
}
ListNode fake = new ListNode(-101);
fake.next = head;
ListNode cur = fake;
while (cur.next != null) {
if (cur.val == cur.next.val) {
cur.next = cur.next.next;
} else {
cur = cur.next;
}
}
return fake.next;
}
//找到重复的,连环删除一系列(通用)
public ListNode deleteDuplicates1(ListNode head) {
if (head == null) {
return head;
}
ListNode fake = new ListNode(-101);
fake.next = head;
ListNode cur = fake;
while (cur.next != null) {
if (cur.val == cur.next.val) {
ListNode temp = cur.next;
while (temp.next != null && temp.val == temp.next.val) {
temp = temp.next;
}
cur.next = temp.next;
} else {
cur = cur.next;
}
}
return fake.next;
}
}

33
Leecode/src/main/java/com/markilue/leecode/hot100/interviewHot/listnode/LC_84_DeleteDuplicatesII.java Normal file
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@ -0,0 +1,33 @@
package com.markilue.leecode.hot100.interviewHot.listnode;
import com.markilue.leecode.listnode.ListNode;
/**
*@BelongsProject: Leecode
*@BelongsPackage: com.markilue.leecode.hot100.interviewHot.listnode
*@Author: markilue
*@CreateTime: 2023-05-11 11:38
*@Description: TODO 力扣82 删除排序链表中的重复元素II:重复全删
*@Version: 1.0
*/
public class LC_84_DeleteDuplicatesII {
public ListNode deleteDuplicates(ListNode head) {
ListNode fake = new ListNode(-101);
fake.next = head;
ListNode cur = fake;
while (cur != null && cur.next != null && cur.next.next != null) {
if (cur.next.val == cur.next.next.val) {
ListNode temp = cur.next;
while (temp.next != null && temp.val == temp.next.val) {
temp = temp.next;
}
cur.next = temp.next;
} else {
cur = cur.next;
}
}
return fake.next;
}
}

45
Leecode/src/main/java/com/markilue/leecode/hot100/second/T23_42_Trap.java
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@ -79,4 +79,49 @@ public class T23_42_Trap {
return result;
}
//二刷:使用单调栈法
public int trap2(int[] height) {
LinkedList<Integer> stack = new LinkedList<>();
int result = 0;
for (int i = 0; i < height.length; i++) {
while (!stack.isEmpty() && height[stack.peek()] < height[i]) {
Integer top = stack.pop();
if (stack.isEmpty()) {
continue;//stack必须有左边的元素才能计算接雨水量
}
Integer left = stack.peek();
result += (i - left - 1) * (Math.min(height[i], height[left]) - height[top]);//宽*高
}
stack.push(i);
}
return result;
}
//二刷:双指针法
public int trap3(int[] height) {
int left = 0;
int right = height.length - 1;
int leftMax = height[left];
int rightMax = height[right];
int result = 0;
while (left < right) {
leftMax = Math.max(leftMax, height[left]);
rightMax = Math.max(rightMax, height[right]);
if (leftMax < rightMax) {
//左边一定能积水
result += (leftMax - height[left]);
left++;
} else {
result += (rightMax - height[right]);
right--;
}
}
return result;
}
}

27
Leecode/src/main/java/com/markilue/leecode/hot100/second/T34_75_SortColors.java
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@ -21,7 +21,7 @@ public class T34_75_SortColors {
@Test
public void test() {
int[] nums = {2, 0, 2, 1, 1, 0};
sortColors(nums);
sortColors1(nums);
System.out.println(Arrays.toString(nums));
}
@ -50,4 +50,29 @@ public class T34_75_SortColors {
nums[i] = nums[j];
nums[j] = temp;
}
//二刷:遇上1就直接交换,遇上0就先交换，在判断要不要和1换
public void sortColors1(int[] nums) {
int index0 = 0;
int index1 = 0;
for (int i = 0; i < nums.length; i++) {
if (nums[i] == 0) {
swap(nums, i, index0);
//判断是不是把1给交换到后面了
if (index0 < index1) {
//把1交换到后面了,交换回来
swap(nums, i, index1);
}
index0++;
index1++;
} else if (nums[i] == 1) {
swap(nums, i, index1);
index1++;
}
}
}
}

51
Leecode/src/main/java/com/markilue/leecode/hot100/second/T56_148_SortList.java Normal file
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@ -0,0 +1,51 @@
package com.markilue.leecode.hot100.second;
import com.markilue.leecode.listnode.ListNode;
import com.markilue.leecode.listnode.ListNodeUtils;
import org.junit.Test;
/**
*@BelongsProject: Leecode
*@BelongsPackage: com.markilue.leecode.hot100.second
*@Author: markilue
*@CreateTime: 2023-05-11 11:00
*@Description: TODO 力扣148 排序链表:
*@Version: 1.0
*/
public class T56_148_SortList {
@Test
public void test() {
ListNode root = ListNodeUtils.build(new int[]{4, 2, 1, 3});
sortList(root);
}
//利用count直接构造:提前记录每一个数出现的次数，直接构造
public ListNode sortList(ListNode head) {
int min = Integer.MAX_VALUE;
int max = Integer.MIN_VALUE;
ListNode cur = head;
while (cur != null) {
if (cur.val < min) min = cur.val;
if (cur.val > max) max = cur.val;
cur = cur.next;
}
int[] count = new int[max - min + 1];
ListNode temp = head;
while (temp != null) {
count[temp.val - min]++;
temp = temp.next;
}
ListNode fake = new ListNode();
ListNode tt = fake;
for (int i = 0; i < count.length; i++) {
int num = count[i];
while (num-- > 0) {
tt.next = new ListNode(i + min);
tt = tt.next;
}
}
return fake.next;
}
}