1
import java.util.Scanner;
public class Main{
public static void main(String[] args){
int maxScore = 0;
Scanner input = new Scanner(System.in);
int numStudent = input.nextInt();
int[] student = new int[numStudent];
for(int i = 0; i < numStudent; ++i){
student[i] = input.nextInt();
if(student[i] >= maxScore)
maxScore = student[i];
}
for(int i = 0; i < numStudent; ++i){
System.out.print("Student " + i + " score is " + student[i] + " and grade is ");
if(student[i] >= maxScore - 10)
System.out.println("A");
else if(student[i] >= maxScore - 20)
System.out.println("B");
else if(student[i] >= maxScore - 30)
System.out.println("C");
else
System.out.println("D");
}
}
}
2
import java.util.Scanner;
public class Main{
public static void main(String[] args){
Scanner input = new Scanner(System.in);
int[] num = new int[10];
for(int i = 0; i < 10; ++i){
num[i] = input.nextInt();
}
for(int i = 9; i >= 0; --i)
System.out.print(num[i] + " ");
}
}
3
import java.util.Scanner;
import java.util.Arrays;
public class Main{
public static void main(String[] args){
final int inf = 101;
Scanner input = new Scanner(System.in);
int[] num = new int[100];
int count = 0;
while(true){
int temp = input.nextInt();
if(temp == 0)
break;
num[count] = temp;
++count;
}
Arrays.sort(num,0,count);
int time = 0;
for(int i = 0; i < count; ++i){
if(num[i] != inf){
time = 0;
for(int j = 0; j < count; ++j){
if(num[i] == num[j]){
++time;
if(i != j)
num[j] = inf;
}
}
System.out.println(num[i] + " occurs " + time + (time > 1 ? " times" : " time"));
}
}
}
}
4
import java.util.Scanner;
import java.util.Arrays;
public class Main{
public static void main(String[] args){
Scanner input = new Scanner(System.in);
int count = input.nextInt();
double[] num = new double[count];
double sum = 0;
for(int i = 0; i < count; ++i){
num[i] = input.nextDouble();
sum += num[i];
}
double average = sum/count;
int higher = 0;
int lower = 0;
int equal = 0;
for(int i = 0; i < count; ++i){
if(num[i] > average)
++higher;
else if(num[i] == average)
++equal;
else
++lower;
}
System.out.println(higher + " " + equal + " " + lower);
}
}
5import java.util.Scanner;public class Main{public static void main(String[] args){int[] nums = new int[100];System.out.print("Enter ten numbers:");Scanner cin = new Scanner(System.in);for(int i = 0; i < 10; ++i){int n = cin.nextInt();++nums[n];}System.out.print("The number of distinct number is ");int count = 0;for(int i = 0; i < 100; ++i)if(nums[i] != 0)++count;System.out.println(count);for(int i = 0; i < 100; ++i){if(nums[i] != 0)System.out.print(i + " ");}}}6。。。。。。。7import java.util.Scanner;public class Main{public static void main(String[] args){int[] nums = new int[10];for(int i = 0; i < 100; ++i){++nums[(int)(Math.random()*10)];}for(int i = 0; i < 10; ++i){System.out.println(i + " " + nums[i]);}}}8import java.util.Scanner;public class Main{public static void main(String[] args){double[] nums = new double[10];Scanner cin = new Scanner(System.in);for(int i = 0; i < 10; ++i){nums[i] = cin.nextDouble();}double num = average(nums);System.out.println(num);}public static int average(int[] array){int sum = 0;for(int i = 0; i < array.length; ++i){sum += array[i];}return sum/array.length;}public static double average(double[] array){double sum = 0;for(int i = 0; i < array.length; ++i){sum += array[i];}return sum/array.length;}}9import java.util.Scanner;public class Main{public static void main(String[] args){double[] nums = new double[10];Scanner cin = new Scanner(System.in);for(int i = 0; i < 10; ++i){nums[i] = cin.nextDouble();}double m = min(nums);System.out.println(m);}public static double min(double[] array){double m = array[0];for(int i = 0; i < 10; ++i){if(array[i] < m)m = array[i];}return m;}}10import java.util.Scanner;public class Main{public static void main(String[] args){double[] nums = new double[10];Scanner cin = new Scanner(System.in);for(int i = 0; i < 10; ++i){nums[i] = cin.nextDouble();}int index = indexOfSmallestElement(nums);System.out.println(index);}public static int indexOfSmallestElement(double[] array){double m = array[0];int index = 0;for(int i = 0; i < 10; ++i){if(array[i] < m){m = array[i];index = i;}}return index;}}11，12。。。。。。13import java.util.Scanner;public class Main{public static void main(String[] args){int n = getRandom(5,6,8,52);System.out.println(n);}public static int getRandom(int... numbers){int num = (int)(System.currentTimeMillis()%54)+1;if(numbers.length == 0)return num;int flag = 0;while(true){for(int i = 0; i < numbers.length; ++i){if(numbers[i] == num){flag = 1;break;}}if(flag == 1)num = (int)(Math.random()*54)+1;elsebreak;}return num;}}14import java.util.Scanner;public class Main{public static void main(String[] args){int n = gcd(25,75,100,105,500);System.out.println(n);}public static int gcd(int... numbers){int num = numbers[0];for(int i = 1; i < numbers.length; ++i){num = flounder(num,numbers[i-1]);}return num;}public static int flounder(int num1, int num2){int t = 0;while(true){t = num1 % num2;if(t == 0)break;num1 = num2;num2 = t;}return num2;}}15同第五题16import java.util.Scanner;public class Main{public static void main(String[] args){long startTime = 0;long endTime = 0;long executionTime = 0;int[] nums = new int[100000];for(int i = 0; i < 100000; ++i){nums[i] = (int)((System.currentTimeMillis()/(i+1))%1000000);}int key = nums[99999];startTime = System.currentTimeMillis();int index = linearSearch(nums,key);endTime = System.currentTimeMillis();executionTime = endTime-startTime;System.out.println(index + " " + executionTime);sort(nums);startTime = System.currentTimeMillis();index = binarySearch(nums,key);endTime = System.currentTimeMillis();executionTime = endTime-startTime;System.out.println(index + " " + executionTime);}public static void sort(int[] list){for(int i = 0; i < list.length-1; ++i){for(int j = i+1; j < list.length; ++j){if(list[i] > list[j]){int temp = list[i];list[i] = list[j];list[j] = temp;}}}}public static int binarySearch(int[] list, int key){int low = 0;int high = list.length-1;while(high >= low){int mid = (low+high)/2;if(key < list[mid])high = mid-1;else if(key == list[mid])return mid;elselow = mid+1;}return -low-1;}public static int linearSearch(int[] list, int key){for(int i = 0; i < list.length; ++i){if(list[i] == key)return i;}return -1;}}
17import java.util.Scanner;public class Main{public static void main(String[] args){Scanner cin = new Scanner(System.in);int n = cin.nextInt();String[] names = new String[n];double[] grades = new double[n];for(int i = 0; i < n; ++i){names[i] = cin.next();grades[i] = cin.nextDouble();}for(int i = 0; i < n-1; ++i){for(int j = i+1; j < n; ++j){if(grades[i] < grades[j]){double temp = grades[i];grades[i] = grades[j];grades[j] = temp;String tmp = names[i];names[i] = names[j];names[j] = tmp;}}}for(int i = 0; i < n; ++i){System.out.println(names[i] + " " + grades[i]);}}}18import java.util.Scanner;public class Main{public static void main(String[] args){Scanner cin = new Scanner(System.in);int n = cin.nextInt();double[] nums = new double[n];for(int i = 0; i < n; ++i){nums[i] = cin.nextDouble();}for(int i = 0; i < n-1; ++i){for(int j = 0; j < n-1; ++j){if(nums[j] < nums[j+1]){double temp = nums[j];nums[j] = nums[j+1];nums[j+1] = temp;}}}for(int i = 0; i < n; ++i){System.out.println(nums[i]);}}}19import java.util.Scanner;public class Main{public static void main(String[] args){Scanner cin = new Scanner(System.in);System.out.println("Enter list:");int n = cin.nextInt();int[] nums = new int[n];for(int i = 0; i < n; ++i)nums[i] = cin.nextInt();for(int i = 1; i < n; ++i){if(nums[i] < nums[i-1]){System.out.println("The list is not sorted");return ;}}System.out.println("The list is already sorted");}}20import java.util.Scanner;public class Main{public static void main(String[] args){Scanner cin = new Scanner(System.in);System.out.println("Enter list:");int n = cin.nextInt();double[] nums = new double[n];for(int i = 0; i < n; ++i)nums[i] = cin.nextDouble();for(int i = n-1; i > 0; --i){for(int j = i-1; j >= 0; --j){if(nums[i] < nums[j]){double temp = nums[i];nums[i] = nums[j];nums[j] = temp;}}}for(int i = 0; i < n; ++i){System.out.println(nums[i]);}}}21import java.util.Scanner;public class Main{//仅适合槽的个数为偶数个，还是二维数组比较直观些，一维数组感觉不太直观。。。。public static void main(String[] args){Scanner cin = new Scanner(System.in);System.out.print("Enter the number of balls to drop:");int ball = cin.nextInt();System.out.print("Enter the number of slots in the bean machine:");int slot = cin.nextInt();int[][] slots = new int[slot][slot];char[] dir = new char[2];dir[0] = 'R';dir[1] = 'L';int limit = slot - 1;int flag = 0;int record = 0;for(int b = 0; b < ball; ++b){record = 0;for(int i = 0; i < limit; ++i){if((flag = (int)(System.currentTimeMillis()/(i+1))%2) == 0){record += 1;if(record > i+1){record -= 2;flag = 1;}System.out.print(dir[flag]);}else{flag = 1;record -= 1;if(record < -i-1){record += 2;flag = 0;}System.out.print(dir[flag]);}}if(record > 0){int h = limit / 2;int n = 0;while(true){if(slots[n][h+(record+1)/2] == 0){slots[n][h+(record+1)/2] = 1;break;}else++n;}}else{int h = limit / 2 + 1;int n = 0;while(true){if(slots[n][h+(record-1)/2] == 0){slots[n][h+(record-1)/2] = 1;break;}else++n;}}System.out.println();}for(int i = slot-1; i >= 0; --i){for(int j = 0; j < slot; ++j){if(slots[i][j] == 0)System.out.print(" ");elseSystem.out.print(0);}System.out.println();}}}22import java.util.Scanner;//二维数组比较直观public class Main{public static void main(String[] args){int[][] map = new int[8][8];int j = (int)(Math.random()*8);int pre = 0;for(int i = 0; i < 8; ++i){if(i == 0)map[i][j] = 1;if(i != 0){while(true){j = (int)(Math.random()*8);if(j != pre && (i-1-pre) != i-j){map[i][j] = 1;break;}}}pre = j;}for(int i = 0; i < 8; ++i){for(int v = 0; v < 8; ++v){System.out.print(map[i][v]);}System.out.println();}}}23import java.util.Scanner;public class Main{public static void main(String[] args){boolean[] box = new boolean[101];int flag = 0;for(int i = 1; i <= 100; ++i){if(i == 1){for(int j = 1; j <= 100; ++j)box[j] = !box[j];}else if(i == 2){for(int j = i; j <= 100; j += 2){box[j] = !box[j];}}else{for(int j = i; j <= 100; j += i){box[j] = !box[j];}}}for(int i = 1; i <= 100; ++i){if(box[i])System.out.println(i);}}}24其实我没有看懂题目25。。。。。26import java.util.Scanner;public class Main{public static void main(String[] args){int[] nums1 = new int[10];int[] nums2 = new int[10];Scanner cin = new Scanner(System.in);for(int i = 0; i < 10; ++i){nums1[i] = cin.nextInt();}for(int i = 0; i < 10; ++i){nums2[i] = cin.nextInt();}System.out.println(equals(nums1,nums2));}public static boolean equals(int[] list1, int[] list2){for(int i = 0; i < list1.length; ++i){if(list1[i] != list2[i])return false;}return true;}}27import java.util.Scanner;public class Main{public static void main(String[] args){int[] nums1 = new int[10];int[] nums2 = new int[10];Scanner cin = new Scanner(System.in);for(int i = 0; i < 10; ++i){nums1[i] = cin.nextInt();}for(int i = 0; i < 10; ++i){nums2[i] = cin.nextInt();}System.out.println(equals(nums1,nums2));}public static boolean equals(int[] list1, int[] list2){int[] book = new int[list1.length];int count = 0;for(int i = 0; i < list2.length; ++i){for(int j = 0; j < list1.length; ++j){if(list2[i] == list1[j] && book[j] == 0){++count;book[j] = 1;break;}}}if(count == list1.length)return true;elsereturn false;}}28import java.util.Scanner;public class Main{public static void main(String[] args){int[] nums = new int[10];Scanner cin = new Scanner(System.in);for(int i = 0; i < 10; ++i){nums[i] = cin.nextInt();}for(int i = 0; i < 10; ++i){for(int j = i+1; j < 10; ++j){System.out.print(nums[i] + "," + nums[j] + " ");}System.out.println();}}}29import java.util.Scanner;public class Main{public static void main(String[] args){int[] nums = new int[13];Scanner cin = new Scanner(System.in);for(int i = 0; i < 13; ++i){nums[i] = i+1;}int count = 0;for(int i = 0; i < 13; ++i){for(int j = 0; j < 13; ++j){for(int n = 0; n < 13; ++n){for(int v = 0; v < 13; ++v){if(nums[i] + nums[j] + nums[n] + nums[v] == 24)++count;}}}}System.out.println(count);}}30import java.util.Scanner;public class Main{public static void main(String[] args){Scanner cin = new Scanner(System.in);System.out.print("Enter the number of values:");int num = cin.nextInt();int[] nums = new int[num];System.out.print("Enter the values:");for(int i = 0; i < num; ++i){nums[i] = cin.nextInt();}System.out.println(isConsecutiveFour(nums));}public static boolean isConsecutiveFour(int[] values){int count = 0;for(int i = 0; i < values.length; ++i){count = 0;for(int j = i; j < values.length; ++j){if(values[i] == values[j]){++count;if(count == 4)return true;}}}return false;}}31import java.util.Scanner;public class Main{public static void main(String[] args){int[] arr1 = new int[6];int[] arr2 = new int[5];Scanner cin = new Scanner(System.in);System.out.print("Enter list1:");for(int i = 0; i < arr1.length; ++i)arr1[i] = cin.nextInt();System.out.print("Enter list2:");for(int i = 0; i < arr2.length; ++i)arr2[i] = cin.nextInt();int[] result = merge(arr1, arr2);for(int i = 0; i < result.length; ++i){if(result[i] != 0){for(int j = 0; j < result[i]; ++j)System.out.print(i + " ");}}}public static int[] merge(int[] list1, int[] list2){int max = 0;for(int i = 0; i < list1.length; ++i){if(list1[i] > max)max = list1[i];}for(int i = 0; i < list2.length; ++i){if(list2[i] > max)max = list2[i];}int[] array = new int[max+1];for(int i = 0; i < list1.length; ++i)++array[list1[i]];for(int i = 0; i < list2.length; ++i)++array[list2[i]];return array;}}32import java.util.Scanner;public class Main{public static void main(String[] args){Scanner cin = new Scanner(System.in);int[] nums = new int[10];for(int i = 0; i < 10; ++i){nums[i] = cin.nextInt();}int num = partition(nums);System.out.println(num);for(int i = 0; i < nums.length; ++i)System.out.print(nums[i] + " ");}public static int partition(int[] list){int temp = 0;int j = 0;for(int i = 1; i < list.length; ++i){if(list[i] <= list[j]){temp = list[i];list[i] = list[j];list[j] = temp;temp = list[j+1];list[j+1] = list[i];list[i] = temp;++j;}}return j;}}33。。。。。。。34import java.util.Scanner;public class Main{public static void main(String[] args){Scanner cin = new Scanner(System.in);String str = cin.nextLine();str = sort(str);System.out.println(str);}public static String sort(String s){char[] chs = s.toCharArray();java.util.Arrays.sort(chs);String result = String.valueOf(chs);return result;}}35import java.util.Scanner;public class Main{public static void main(String[] args){String[] words = {"write","word","that","exit","property","length","long"};int n = words.length;Scanner cin = new Scanner(System.in);while(true){int num = (int)(Math.random()*n);char[] word = new char[words[num].length()];for(int i = 0; i < words[num].length(); ++i){word[i] = words[num].charAt(i);}int len = word.length;int count = 0;int flag = 0;int mark = 0;char[] guess = new char[len];char cTemp;String STemp = null;java.util.Arrays.fill(guess, '*');while(true){mark = 0;System.out.print("(Guess)Enter a letter in word ");System.out.print(String.valueOf(guess) + " >");STemp = cin.nextLine(); cTemp = STemp.charAt(0);for(int i = 0; i < len; ++i){if(cTemp == word[i] && guess[i] != '*'){System.out.println(cTemp + " is already in the word");break;}if(cTemp == word[i] && guess[i] == '*'){mark = 1;++count;guess[i] = cTemp;if(count == len){flag = 1;break;}}}if(mark == 0)System.out.println(cTemp + " is not in the word");if(flag == 1)break;}System.out.println("The word is " + String.valueOf(word) + ". You missed 1 time" );System.out.print("Do you want to guess another word? Enter y or n >");String judge = cin.nextLine();if(judge.charAt(0) == 'n' || judge.charAt(0) == 'n')break;}}}
