A.门牌制作
package com.moni;
public class AMain {
public static void main(String[] args) {
StringBuilder sBuilder=new StringBuilder();
int count=0;
for(int i=1;i<=2020;i++) {
sBuilder.append(i);
}
int n = sBuilder.length();
for(int i=0;i<n;i++) {
if(sBuilder.charAt(i)=='2') {
count++;
}
}
System.out.println(count);
}
}
答案：624
B.寻找2020
package com.moni;
import java.util.Scanner;
public class BMain {
static int count=0;
public static void main(String[] args) {
String[] strs =new String[300];
Scanner scan=new Scanner(System.in);
for(int i=0;i<300;i++) {
strs[i]=scan.nextLine();
}
scan.close();
cal(strs);
System.out.println(count);
}
public static void cal(String[] strs) {
int m = strs.length;int n=strs[0].length();
for(int i=0;i<m;i++) {
for(int j=0;j<n;j++) {
if(strs[i].charAt(j)=='2') {
//横向
if(n-j>=4&&strs[i].charAt(j+1)=='0'&&strs[i].charAt(j+2)=='2'&&strs[i].charAt(j+3)=='0') {
count++;
}
//竖向
if(m-i>=4&&strs[i+1].charAt(j)=='0'&&strs[i+2].charAt(j)=='2'&&strs[i+3].charAt(j)=='0') {
count++;
}
//斜向
if(n-j>=4&&m-i>=4&&strs[i+1].charAt(j+1)=='0'&&strs[i+2].charAt(j+2)=='2'&&strs[i+3].charAt(j+3)=='0') {
count++;
}
}
}
}
}
}
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16520
C.蛇形填数
package com.moni;
public class CMain {
public static void main(String[] args) {
int result= add(20);
System.out.println(result);
}
public static int add(int n) {
if(n==1) return 1;
return (n-1)*4+add(n-1);
}
}
761
D.七段码
思路：利用dfs 将所有的可能列举出来，七段码都有两种选择（发光1，不发光0），一共七层，然后先将所有发光的并且相邻的的码合并，最后看剩下的集合数，如果==1，那么就是符合条件的。
package com.moni;
public class DMain {
static int[][] e=new int[10][10];
static int count=0;
static boolean[] isLight=new boolean[10]; //true->亮;false->灭
static int[] union=new int[10];
public static void main(String[] args) {
e[1][2]=e[1][6]=1;//表示相邻
e[2][1]=e[2][7]=e[2][3]=1;
e[3][2]=e[3][7]=e[3][4]=1;
e[4][3]=e[4][5]=1;
e[5][7]=e[5][6]=e[5][4]=1;
e[6][5]=e[6][7]=e[6][1]=1;
e[7][2]=e[7][3]=e[7][5]=e[7][6]=1;
dfs(1);
System.out.println(count);
}
public static void dfs(int n) {
if(n>7) {
for(int i=1;i<=7;i++) {
union[i]=i;
}
for(int i=1;i<=7;i++) {
for(int j=1;j<=7;j++) {
if(e[i][j]==1&&isLight[i]&&isLight[j]) {
int fX = find(i);int fY=find(j);
if(fX!=fY) {
union[fX]=fY;
}
}
}
}
int c=0;
for(int i=1;i<=7;i++) {
if(isLight[i]&&union[i]==i) {
c++;
}
}
if(c==1) count++;
return;
}
isLight[n]=true;
dfs(n+1);
isLight[n]=false;
dfs(n+1);
}
public static int find(int n) {
if(union[n]==n) return n;
return find(union[n]);
}
}
答案：80
E.排序
要使交换次数最多并且最短，肯定是逆序。
先写一个冒泡排序，并在排序过程中统计交换次数。
package com.moni;
import java.util.Scanner;
public class EMain {
public static void main(String[] args) {
Scanner scan =new Scanner(System.in);
String str = scan.nextLine();
int n=str.length();
char[] charArray = str.toCharArray();
int count=0;
for(int i=0;i<n;i++) {
for(int j=0;j<n-i-1;j++) {
if(charArray[j+1]<charArray[j]) {
char temp;
temp=charArray[j];
charArray[j]=charArray[j+1];
charArray[j+1]=temp;
count++;
}
}
}
System.out.println(count);
}
}
nmlkjihgfedcba
91
onmlkjihgfedcba
105
减少5次交换次数
jonmlkihgfedcba
jonmlkihgfedcba
100
F.成绩分析
package com.moni;
import java.util.Arrays;
import java.util.Scanner;
public class FMain {
static int[] scores;
public static void main(String[] args) {
Scanner scan=new Scanner(System.in);
int n= scan.nextInt();
scores=new int [n];
for(int i=0;i<n;i++) {
scores[i]= scan.nextInt();
}
Arrays.sort(scores);
double ave;
double sum=0;
for(int i=0;i<n;i++) {
sum+= scores[i];
}
ave=(double)Math.round(sum/n*100)/100;
System.out.println(scores[n-1]);
System.out.println(scores[0]);
System.out.printf("%.2f",ave);
}
}
7
80
92
56
74
88
99
10
99
10
71.29
G.单词分析
package com.moni;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
public class GMain {
static Map<Character, Integer> maps=new HashMap<>();
public static void main(String[] args) {
Scanner scan=new Scanner(System.in);
String str = scan.nextLine();
char[] charArray = str.toCharArray();
int n=charArray.length;
for(int i=0;i<n;i++) {
if(maps.containsKey(charArray[i])) {
int num=maps.get(charArray[i]);
maps.put(charArray[i],num+1);
}else {
maps.put(charArray[i],1);
}
}
int max=-1;
char word =0;
for(Character ch: maps.keySet()) {
Integer num = maps.get(ch);
if (num>max) {
max=num;
word=ch;
}
}
System.out.println(String.valueOf(word));
System.out.println(max);
}
}
longlonglongistoolong
o
6