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反思后，需要加强地方有两点：
（1）尽可能减少代码冗余，使得代码更为简练，尽量使代码“优美”，不要在网上找API。
（2）写完之后不能以Accept接受为标准，写完之后仍需借鉴查看他人代码。
2000：
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner scanner01 = new Scanner(System.in);
while (scanner01.hasNext()) {
//读取字符串
String string01 = scanner01.next();
char[] character = new char[string01.length()];
//将字符串切割成单个字符
for (int i = 0; i < string01.length(); i++) {
character[i] = string01.charAt(i);
}
int count = 0;
char tmp;
//先获取最小值，很笨的排序方法
for (int i = 0; i < string01.length(); i++) {
// char min = character[count];//赋给他最小值
//双重循环进行判定
for (int j = count; j < character.length; j++) {
if (character[j] < character[count]) {
tmp = character[count];
character[count] = character[j];
character[j] = tmp;
}
}
count++;
}
//按照格式输出。最后一个不加空格。
for (int i = 0; i < character.length; i++) {
System.out.print(character[i]);
if(i<character.length-1){
System.out.print(" ");
}
}
System.out.println();
}
}
}
2001：
import java.text.DecimalFormat;
import java.util.*;
//百度了double的格式化输出的两种方式
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
//double比float的精度要高。
while (scanner.hasNext()) {
float[] num = new float[4];
for (int i = 0; i < num.length; i++) {
num[i] = scanner.nextFloat();
}
double length = Math.sqrt((num[2] - num[0]) * (num[2] - num[0]) + (num[3] - num[1]) * (num[3] - num[1]));
// //利用DecimalFormat实现格式化输出。
// DecimalFormat df = new DecimalFormat("#.##");
// System.out.println(df.format(length));
//真的就是保存两位小数
System.out.println(String.format("%.2f",length));
}
}
}
2002：
import java.util.*;
public class Main {
static final double PI = 3.1415927;
public static void main(String[] args) {
Scanner scanner01 = new Scanner(System.in);
while (scanner01.hasNext()) {
double radius = scanner01.nextDouble();
System.out.println(String.format("%.3f", 4.0 / 3 * PI * Math.pow(radius, 3)));
}
}
}
2003：
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner sc_01 = new Scanner(System.in);
while (sc_01.hasNext()) {
double num_01 = sc_01.nextDouble();
System.out.println(String.format("%.2f", Math.abs(num_01)));
}
}
}
2004：
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner sc_01 = new Scanner(System.in);
while (sc_01.hasNext()) {
int score_01 = sc_01.nextInt();
if (score_01 >= 0 && score_01 <= 59) {
System.out.println("E");
} else if (score_01 > 59 && score_01 <= 69) {
System.out.println("D");
} else if (score_01 > 69 && score_01 <= 79) {
System.out.println("C");
} else if (score_01 > 79 && score_01 <= 89) {
System.out.println("B");
} else if (score_01 > 89 && score_01 <= 100) {
System.out.println("A");
} else {
System.out.println("Score is error!");
}
}
}
}
2005：
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner sc_01 = new Scanner(System.in);
while (sc_01.hasNext()) {
//获取输入的字符串
String date = sc_01.next();
//获取两次出现/的位置,并截取相应字符串。
int t1 = date.indexOf("/");
int t2 = date.lastIndexOf("/");
//获取月日字符串
String year = date.substring(0, t1);
String month = date.substring(t1 + 1, t2);
String day = date.substring(t2 + 1, date.length());
//将其合并为数字
int year1 = Integer.parseInt(year);
int month1 = Integer.parseInt(month);
int day1 = Integer.parseInt(day);
int monthdays = 0;
//使用两个数组将起存起来
int []DateFormat1=new int[]{0,31,28,31,30,31,30,31,31,30,31,30};
int []DateFormat2=new int[]{0,31,29,31,30,31,30,31,31,30,31,30};
//判断是闰年。节省了很多代码不是吗
if(year1 % 4 == 0 && year1 % 100 != 0 || year1 %400 ==0){
for(int i = 0;i<month1;i++){
monthdays+=DateFormat2[i];
}
}else{
for(int i = 0;i<month1;i++){
monthdays+=DateFormat1[i];
}
}
System.out.println(monthdays + day1);
}
}
}
2006：
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
while (scanner.hasNext()) {
int num_length = scanner.nextInt();
int[] num_01 = new int[num_length];
int result = 1;
for (int i = 0; i < num_length; i++) {
num_01[i] = scanner.nextInt();
if (num_01[i] % 2 == 1) {
result *= num_01[i];
}
}
System.out.println(result);
}
}
}
******2007：
import java.util.Scanner;
//唉。。。。都听不懂人话了，没理解题意。，参考网上代码重新写的，仅此一次
public class Main{
public static void main(String[] args){
Scanner sc_01 = new Scanner(System.in);
while(sc_01.hasNext()){
int number_01 = sc_01.nextInt();
int number_02 = sc_01.nextInt();
// 还要考虑大于的情况。充分考虑一切情况。
if(number_01>number_02){
int tmp = number_01;
number_01 = number_02;
number_02 = tmp;
}
int result1 = 0,result2 = 0;
for(int i = number_01;i<=number_02;i++){
if(i%2==0){
result1+=Math.pow(i,2);
}else{
result2+=Math.pow(i,3);
}
}
System.out.println(result1+" "+result2);
}
}
}
2008：
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner sc_01 = new Scanner(System.in);
while (sc_01.hasNext()) {
int nuber_amo = sc_01.nextInt();
int positive_number = 0, negative_number = 0, zero = 0;
if (nuber_amo == 0) {
} else {
for (int i = 0; i < nuber_amo; i++) {
double number_01 = sc_01.nextDouble();
if (number_01 == 0) {
zero++;
} else if (number_01 < 0) {
negative_number++;
} else {
positive_number++;
}
}
System.out.println(negative_number + " " + zero + " " + positive_number);
}
}
}
}
2009：
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc_01 = new Scanner(System.in);
while (sc_01.hasNext()) {
double result = 0;
double UpdateValue;
//初始值
int Initial_value = sc_01.nextInt();
UpdateValue = (double)Initial_value;
//计算个数
int number = sc_01.nextInt();
for (int i = 0; i < number; i++) {
result+=UpdateValue;
UpdateValue = Math.pow(UpdateValue, 1.0 / 2);
}
System.out.println(String.format("%.2f", result));
}
}
}
2010：
import java.util.ArrayList;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc_01 = new Scanner(System.in);
while (sc_01.hasNext()) {
int begin_num = sc_01.nextInt();
int end_num = sc_01.nextInt();
ArrayList<Integer> arrayList01 = new ArrayList<Integer>();
for (int i = begin_num; i <= end_num; i++) {
int Percentile = i / 100;
int Tenth_place = i % 100 / 10;
int Quota = i % 100 % 10;
if(i == Math.pow(Percentile,3)+Math.pow(Tenth_place,3)+Math.pow(Quota,3)){
arrayList01.add(i);
}
}
if(arrayList01.size() == 0 ){
System.out.println("no");
}else{
for(int i= 0;i<arrayList01.size()-1;i++){
System.out.print(arrayList01.get(i)+" ");
}
System.out.println(arrayList01.get(arrayList01.size()-1));
}
}
}
}
2011：
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc_01 = new Scanner(System.in);
while (sc_01.hasNext()) {
int number_amount = sc_01.nextInt();
//测试个数
int[] test_num = new int[number_amount];
//输入每个元素
for (int number = 0; number < number_amount; number++) {
test_num[number] = sc_01.nextInt();
}
//对每个元素分别求值。
for (int number = 0; number < number_amount; number++) {
double result = 0,fenmu = 0;
for (int i = 0; i < test_num[number]; i++) {
fenmu = Math.pow(-1, i);
result += fenmu / (i+1);
}
System.out.println(String.format("%.2f", result));
}
}
}
}
2039：
import java.util.Arrays;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc_01 = new Scanner(System.in);
while (sc_01.hasNext()) {
int line = sc_01.nextInt();
//你也没说必须是double类型啊，只是说数啊。fuck
//有大佬用Arrays.sort()直接进行排序，将最小两个相加大于第三个就可以，无意简化太多。
for (int i = 0; i < line; i++) {
double num_01 = sc_01.nextDouble();
double num_02 = sc_01.nextDouble();
double num_03 = sc_01.nextDouble();
if (num_01 + num_02 > num_03 && num_01 - num_02 < num_03
&& num_01 + num_03 > num_02 && num_01 - num_03 < num_02
&& num_02 + num_03 > num_01 && num_02 - num_03 < num_01) {
System.out.println("YES");
} else {
System.out.println("NO");
}
}
}
}
}