msb-public-java
/
LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
1
2
Code Issues Projects Releases Wiki Activity

add q141/q202/q258

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pull/6/head
yuanguangxin 4 years ago
parent 0c5a455d64
commit 1641b825ff
8 changed files with 168 additions and 24 deletions
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74
.idea/workspace.xml
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@ -2,8 +2,14 @@
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<change afterPath="$PROJECT_DIR$/src/数字操作/q202_快乐数/Solution.java" afterDir="false" />
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@ -66,11 +72,11 @@
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<component name="RecentsManager">
<key name="CopyClassDialog.RECENTS_KEY">
<recent name="hash相关.q141_环形链表.f2" />
<recent name="hash相关.q141_环形链表.f1" />
<recent name="树的遍历.q102_二叉树的层次遍历" />
<recent name="q110.q2" />
<recent name="q110" />
<recent name="q450" />
<recent name="q701" />
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<key name="CopyFile.RECENT_KEYS">
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@ -79,7 +85,7 @@
<recent name="$PROJECT_DIR$/src/q206/f1" />
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<configuration name="Solution (1)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="hash相关.q1_两数之和.f1.Solution" />
<module name="LeetCode" />
@ -119,6 +125,19 @@
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</method>
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<configuration name="Solution (4)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="数字操作.q202_快乐数.Solution" />
<module name="LeetCode" />
<extension name="coverage">
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<option name="PATTERN" value="数字操作.q202_快乐数.*" />
<option name="ENABLED" value="true" />
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<option name="Make" enabled="true" />
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<configuration name="Solution" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="回溯法.q22_括号生成.f2.Solution" />
<module name="LeetCode" />
@ -212,11 +231,11 @@
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<recent_temporary>
<list>
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<task id="LOCAL-00001" summary="add q5/q7/q172">
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@ -577,7 +603,6 @@
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<MESSAGE value="add q9" />
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<MESSAGE value="add q14/q16/q20" />
@ -602,7 +627,8 @@
<MESSAGE value="add q73/q102/q118/q224" />
<MESSAGE value="add q736" />
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<option name="LAST_COMMIT_MESSAGE" value="增加操作系统相关问题" />
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3
README.md
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@ -5,6 +5,7 @@
### Hash相关
* [q1_两数之和](/src/hash相关/q1_两数之和)
* [q141_环形链表](/src/hash相关/q141_环形链表)
### 链表操作
@ -35,6 +36,8 @@
* [q9_回文数](/src/数字操作/q9_回文数)
* [q43_字符串相乘](/src/数字操作/q43_字符串相乘)
* [q172_阶乘后的零](/src/数字操作/q172_阶乘后的零)
* [q202_快乐数](/src/数字操作/q202_快乐数)
* [q258_各位相加](/src/数字操作/q258_各位相加)
### 数组操作

12
src/hash相关/q141_环形链表/f1/ListNode.java
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@ -0,0 +1,12 @@
package hash相关.q141_环形链表.f1;
public class ListNode {
int val;
ListNode next;
ListNode(int x) {
val = x;
}
}

23
src/hash相关/q141_环形链表/f1/Solution.java
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@ -0,0 +1,23 @@
package hash相关.q141_环形链表.f1;
import java.util.HashSet;
import java.util.Set;
/**
* 哈希表 o(n)
*/
public class Solution {
public boolean hasCycle(ListNode head) {
Set<ListNode> nodesSeen = new HashSet<>();
while (head != null) {
if (nodesSeen.contains(head)) {
return true;
} else {
nodesSeen.add(head);
}
head = head.next;
}
return false;
}
}

12
src/hash相关/q141_环形链表/f2/ListNode.java
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@ -0,0 +1,12 @@
package hash相关.q141_环形链表.f2;
public class ListNode {
int val;
ListNode next;
ListNode(int x) {
val = x;
}
}

23
src/hash相关/q141_环形链表/f2/Solution.java
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@ -0,0 +1,23 @@
package hash相关.q141_环形链表.f2;
/**
* 快慢指针 o(n)
*/
public class Solution {
public boolean hasCycle(ListNode head) {
if (head == null || head.next == null) {
return false;
}
ListNode slow = head;
ListNode fast = head.next;
while (slow != fast) {
if (fast == null || fast.next == null) {
return false;
}
slow = slow.next;
fast = fast.next.next;
}
return true;
}
}

29
src/数字操作/q202_快乐数/Solution.java
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@ -0,0 +1,29 @@
package 数字操作.q202_快乐数;
/**
* 快慢指针，思想同q141判断是否有环，用快慢指针找出循环终止条件 o(n)
*/
public class Solution {
private int bitSquareSum(int n) {
int sum = 0;
while (n > 0) {
int bit = n % 10;
sum += bit * bit;
n = n / 10;
}
return sum;
}
public boolean isHappy(int n) {
int slow = n;
int fast = n;
do {
slow = bitSquareSum(slow);
fast = bitSquareSum(fast);
fast = bitSquareSum(fast);
} while (slow != fast);
return slow == 1;
}
}

16
src/数字操作/q258_各位相加/Solution.java
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@ -0,0 +1,16 @@
package 数字操作.q258_各位相加;
/**
* 找规律 o(1) xyz=100*x+10*y+z=99*x+9*y+x+y+z
*/
public class Solution {
public int addDigits(int num) {
if (num % 9 == 0 && num != 0) {
num = 9;
} else {
num %= 9;
}
return num;
}
}
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