msb-public-java
/
LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
1
2
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add q46

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pull/6/head
yuanguangxin 4 years ago
parent 9954ef31e8
commit bb5208b0cc
4 changed files with 151 additions and 48 deletions
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104
.idea/workspace.xml
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@ -2,9 +2,10 @@
<project version="4">
<component name="ChangeListManager">
<list default="true" id="af7ffdf2-4ddc-4ed6-8222-60ed5acbc2ed" name="Default Changelist" comment="">
<change afterPath="$PROJECT_DIR$/src/q26/Solution.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q43/Solution.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q46/Solution.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q46/f2/Solution.java" afterDir="false" />
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<option name="HIGHLIGHT_CONFLICTS" value="true" />
@ -74,13 +75,13 @@
<recent name="$PROJECT_DIR$/src/q206/f1" />
</key>
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<component name="RunManager" selected="Application.Solution (4)">
<component name="RunManager" selected="Application.Solution (1)">
<configuration name="Solution (1)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q14.Solution" />
<option name="MAIN_CLASS_NAME" value="q46.f2.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
<option name="PATTERN" value="q14.*" />
<option name="PATTERN" value="q46.f2.*" />
<option name="ENABLED" value="true" />
</pattern>
</extension>
@ -89,11 +90,11 @@
</method>
</configuration>
<configuration name="Solution (2)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q16.Solution" />
<option name="MAIN_CLASS_NAME" value="q746.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
<option name="PATTERN" value="q16.*" />
<option name="PATTERN" value="q746.*" />
<option name="ENABLED" value="true" />
</pattern>
</extension>
@ -128,11 +129,11 @@
</method>
</configuration>
<configuration name="Solution" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q20.Solution" />
<option name="MAIN_CLASS_NAME" value="q46.f1.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
<option name="PATTERN" value="q20.*" />
<option name="PATTERN" value="q46.f1.*" />
<option name="ENABLED" value="true" />
</pattern>
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@ -168,11 +169,11 @@
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<recent_temporary>
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<item itemvalue="Application.Solution (2)" />
<item itemvalue="Application.Solution (5)" />
<item itemvalue="Application.Solution (4)" />
<item itemvalue="Application.Solution (3)" />
<item itemvalue="Application.Solution" />
<item itemvalue="Application.Solution (2)" />
<item itemvalue="Application.Solution (1)" />
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@ -210,7 +211,8 @@
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<task id="LOCAL-00001" summary="add q5/q7/q172">
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@ -254,7 +256,14 @@
<option name="project" value="LOCAL" />
<updated>1580409713059</updated>
</task>
<option name="localTasksCounter" value="7" />
<task id="LOCAL-00007" summary="add q26/q43">
<created>1580496640692</created>
<option name="number" value="00007" />
<option name="presentableId" value="LOCAL-00007" />
<option name="project" value="LOCAL" />
<updated>1580496640692</updated>
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<option name="localTasksCounter" value="8" />
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@ -267,76 +276,77 @@
<MESSAGE value="add q6" />
<MESSAGE value="add q14/q16/q20" />
<MESSAGE value="add q21" />
<option name="LAST_COMMIT_MESSAGE" value="add q21" />
<MESSAGE value="add q26/q43" />
<option name="LAST_COMMIT_MESSAGE" value="add q26/q43" />
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2
src/q236/Solution.java
Unescape View File

@ -1,7 +1,7 @@
package q236;
/**
* LCA二叉树的最近公共祖先（递归）
* LCA二叉树的最近公共祖先（递归）o(n)
*/
class Solution {
public TreeNode lowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q) {

41
src/q46/f1/Solution.java
Unescape View File

@ -0,0 +1,41 @@
package q46.f1;
import java.util.ArrayList;
import java.util.List;
/**
* 插队法 o((n-1)!+(n-2)!+···+2!+1!)
*/
public class Solution {
public List<List<Integer>> fc(List<List<Integer>> nums, int c) {
List<List<Integer>> result = new ArrayList<>();
for (int i = 0; i < nums.size(); i++) {
for (int j = 0; j <= nums.get(i).size(); j++) {
List<Integer> temp = new ArrayList<>(nums.get(i));
temp.add(j, c);
result.add(temp);
}
}
return result;
}
public List<List<Integer>> permute(int[] nums) {
List<List<Integer>> result = new ArrayList<>();
if (nums.length == 0) {
return result;
}
List<Integer> to = new ArrayList<>();
to.add(nums[0]);
result.add(to);
for (int i = 1; i < nums.length; i++) {
result = fc(result, nums[i]);
}
System.out.println(result);
return result;
}
public static void main(String[] args) {
new Solution().permute(new int[]{1, 2, 3});
//4—>3！+2！+1！
}
}

52
src/q46/f2/Solution.java
Unescape View File

@ -0,0 +1,52 @@
package q46.f2;
import java.util.ArrayList;
import java.util.List;
/**
* 回溯法(DFS深度优先遍历) o(n*n!)
*/
public class Solution {
public List<List<Integer>> permute(int[] nums) {
int len = nums.length;
List<List<Integer>> res = new ArrayList<>();
if (len == 0) {
return res;
}
boolean[] used = new boolean[len];
List<Integer> path = new ArrayList<>();
dfs(nums, len, 0, path, used, res);
return res;
}
private void dfs(int[] nums, int len, int depth,
List<Integer> path, boolean[] used,
List<List<Integer>> res) {
if (depth == len) {
res.add(new ArrayList<>(path));
return;
}
for (int i = 0; i < len; i++) {
if (!used[i]) {
path.add(nums[i]);
used[i] = true;
dfs(nums, len, depth + 1, path, used, res);
// 状态重置，是从深层结点回到浅层结点的过程，代码在形式上和递归之前是对称的
used[i] = false;
path.remove(depth);
}
}
}
public static void main(String[] args) {
int[] nums = {1, 2, 3};
Solution solution = new Solution();
List<List<Integer>> lists = solution.permute(nums);
}
}
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