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Change-Id: I063540e070f881de78b6f278119ce7a7e05f8e75
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‎.idea/modules.xml

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‎.idea/workspace.xml

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‎[0507][Perfect Number]/[0507][Perfect Number].iml

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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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<orderEntry type="module-library">
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<library name="JUnit4">
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<CLASSES>
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<root url="jar://$MODULE_DIR$/../lib/junit-4.12.jar!/" />
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<root url="jar://$MODULE_DIR$/../lib/hamcrest-core-1.3.jar!/" />
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</CLASSES>
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<JAVADOC />
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<SOURCES />
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</library>
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</orderEntry>
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</component>
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</module>

‎[0507][Perfect Number]/src/Solution.java

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/**
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* Author: 王俊超
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* Time: 2020-06-29 08:33
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* CSDN: http://blog.csdn.net/derrantcm
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* Github: https://github.com/Wang-Jun-Chao
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* Declaration: All Rights Reserved !!!
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**/
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public class Solution {
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public boolean checkPerfectNumber(int num) {
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if (num < 6) {
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return false;
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}
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int sum = 1;
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int sqrt = (int) Math.sqrt(num);
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for (int i = 2; i <= sqrt; i++) {
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if (num % i == 0) {
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sum += i;
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sum += num / i;
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}
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}
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return sum == num;
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}
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}

‎[0507][Perfect Number]/src/SolutionTest.java

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import org.junit.Assert;
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/**
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* Author: 王俊超
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* Time: 2020-06-29 08:36
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* CSDN: http://blog.csdn.net/derrantcm
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* Github: https://github.com/Wang-Jun-Chao
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* Declaration: All Rights Reserved !!!
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**/
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public class SolutionTest {
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@org.junit.Test
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public void checkPerfectNumber() {
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Solution s = new Solution();
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Object[][] data = {
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{28, true},
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{-1, false},
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{0, false},
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{1, false},
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{6, true},
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{7, false},
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{8, false},
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};
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for (Object[] d: data) {
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Assert.assertEquals(s.checkPerfectNumber((Integer) d[0]), d[1]);
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}
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}
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}

‎[0509][Fibonacci Number]/[0509][Fibonacci Number].iml

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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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<orderEntry type="module-library">
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<library name="JUnit4">
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<CLASSES>
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<root url="jar://$MODULE_DIR$/../lib/junit-4.12.jar!/" />
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<root url="jar://$MODULE_DIR$/../lib/hamcrest-core-1.3.jar!/" />
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</CLASSES>
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<JAVADOC />
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<SOURCES />
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</library>
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</orderEntry>
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</component>
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</module>

‎[0509][Fibonacci Number]/src/Solution.java

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/**
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* Author: 王俊超
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* Time: 2020-06-29 08:44
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* CSDN: http://blog.csdn.net/derrantcm
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* Github: https://github.com/Wang-Jun-Chao
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* Declaration: All Rights Reserved !!!
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**/
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public class Solution {
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public int fib(int N) {
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if (N <= 0) {
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return 0;
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} else if (N == 1) {
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return 1;
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}
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int n2 = 0;
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int n1 = 1;
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int n0;
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for (int i = 2; i <= N; i++) {
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n0 = n1 + n2;
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n2 = n1;
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n1 = n0;
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}
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return n1;
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}
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}

‎[0509][Fibonacci Number]/src/SolutionTest.java

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import org.junit.Assert;
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/**
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* Author: 王俊超
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* Time: 2020-06-29 08:48
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* CSDN: http://blog.csdn.net/derrantcm
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* Github: https://github.com/Wang-Jun-Chao
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* Declaration: All Rights Reserved !!!
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**/
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public class SolutionTest {
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@org.junit.Test
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public void fib() {
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Solution s = new Solution();
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Object[][] data = {
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{0, 0},
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{1, 1},
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{2, 1},
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{3, 2},
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};
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for (Object[] d : data) {
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Assert.assertEquals(s.fib((Integer) d[0]), d[1]);
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}
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}
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}

‎[0520][Detect Capital]/[0520][Detect Capital].iml

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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>

‎[0520][Detect Capital]/src/Solution.java

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/**
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* Author: 王俊超
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* Time: 2020-06-29 08:42
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* CSDN: http://blog.csdn.net/derrantcm
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* Github: https://github.com/Wang-Jun-Chao
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* Declaration: All Rights Reserved !!!
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**/
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public class Solution {
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/**
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* <pre>
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* Given a word, you need to judge whether the usage of capitals in it is right or not.
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*
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* We define the usage of capitals in a word to be right when one of the following
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* cases holds:
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*
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* All letters in this word are capitals, like "USA".
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* All letters in this word are not capitals, like "leetcode".
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* Only the first letter in this word is capital, like "Google".
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* Otherwise, we define that this word doesn't use capitals in a right way.
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*
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*
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* Example 1:
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*
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* Input: "USA"
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* Output: True
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*
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*
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* Example 2:
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*
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* Input: "FlaG"
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* Output: False
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*
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*
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* Note: The input will be a non-empty word consisting of uppercase
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* and lowercase latin letters.
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* </pre>
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*
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* @param word
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* @return
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*/
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public boolean detectCapitalUse(String word) {
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if (Character.isUpperCase(word.charAt(0))) {
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return isAllUpperCase(word.substring(1)) || isAllLowerCase(word.substring(1));
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} else if (Character.isLowerCase(word.charAt(0))) {
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return isAllLowerCase(word.substring(1));
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}
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return false;
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}
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private boolean isAllLowerCase(String s) {
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for (int i = 0; i < s.length(); i++) {
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if (!Character.isLowerCase(s.charAt(i))) {
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return false;
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}
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}
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return true;
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}
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private boolean isAllUpperCase(String s) {
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for (int i = 0; i < s.length(); i++) {
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if (!Character.isUpperCase(s.charAt(i))) {
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return false;
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}
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}
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return true;
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}
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}
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