Dien

Java/1.10.java

@@ -0,0 +1,81 @@
+// EX 1.10 Write a program to get next day of a given date
+// Write a program to get next day of a given date.
+
+// Please don't use any library of Java. 
+
+// Test data 1
+// Input: 2020, 02, 29
+// Output: 2020, 03, 01
+import java.util.Scanner;
+public class Main {
+    public static void main(String[] Strings) {
+        Scanner scanner = new Scanner(System.in);
+        String string = scanner.nextLine();
+        var year = string.substring(0,4);
+        int nam = Integer.parseInt(year);
+        var month = string.substring(6,8);
+        int thang = Integer.parseInt(month);
+        var day = string.substring(10,12);
+        int ngay = Integer.parseInt(day);
+        boolean nhuan = true;
+        int i;
+        if (nam % 400 == 0) {
+            nhuan = true;
+        }
+        else if (nam % 100 == 0) {
+            nhuan = false;
+        }
+        else if (nam % 4 == 0) {
+            nhuan = true;
+        }
+        else {
+            nhuan = false;
+        }
+
+        if (thang == 1 || thang == 3 || thang == 5 || thang == 7 || thang == 8 || thang == 10 || thang == 12) {
+            i = 31;
+        }
+        else if (thang == 2) {
+            if (nhuan) {
+                i =  29;
+            }
+            else {
+                i = 28;
+            }
+        }
+        else {
+            i = 30;
+        }
+
+        if (ngay < i) {
+            ngay = ngay + 1;
+        }
+        else {
+            ngay = 1;
+            if (thang == 12) {
+                thang = 1;
+                nam = nam + 1;
+            }
+            else {
+                thang = thang + 1;
+            }
+        }
+        System.out.print(nam);
+        System.out.print(", ");
+        if (thang < 10) {
+            System.out.print("0");
+            System.out.print(thang);
+        }
+        else {
+            System.out.print(thang);
+        }
+        System.out.print(", ");
+        if (ngay < 10) {
+            System.out.print("0");
+            System.out.print(ngay);
+        }
+        else {
+        System.out.print(ngay);
+        }
+    }
+}

Java/1.2.java

@@ -0,0 +1,26 @@
+// EX 1.2 Write a program that takes a year from the user and print whether that year is a leap year or not.
+// Write a program that takes a year from the user and print whether that year is a leap year or not. 
+// Test Data
+
+// Input the year: 2016
+
+// Expected Output : True
+import java.util.Scanner;
+
+public class Main {
+
+    public static void main(String[] args) {
+        try (Scanner scanner = new Scanner(System.in)) {
+            int year = scanner.nextInt();
+            if ( year % 4 == 0 && year % 100 != 0) {
+                System.out.print("True");
+            }
+            else if ( year % 400 == 0) {
+                System.out.print("True");
+            }
+            else {
+                System.out.print("False");
+            }
+        }
+    }
+}

Java/1.4.java

@@ -0,0 +1,65 @@
+// EX 1.4. Write a program which reads a sequence of integers and prints how often each number of this sequence occurs.
+// Write a program which reads a sequence of integers and prints how often each number of this sequence occurs.
+
+// Example
+
+// Input: 
+
+// 9
+
+// 1 3 5 7 5 3 7 2 5
+
+// Output: 
+
+// 1(1), 3(2), 5(3), 7(2), 2(1)
+
+
+
+// Please note that: 
+
+// 9 as array size
+
+// 1 3 5 7 5 3 7 2 5 as array
+import java.util.Scanner;
+
+public class Main {
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        int a = scanner.nextInt();
+        int[] arr = new int[a];
+        for (int i = 0; i < a; i++) {
+            arr[i] = scanner.nextInt();
+        }
+
+        boolean check = true;
+        boolean first = true;
+        for (int i = 0; i < arr.length; i++) {
+            check = true;
+            for (int j = 0; j < i; j++) {
+                if (arr[i] == arr[j]) {
+                    check = false;
+                    break;
+                }
+            }
+
+            if (check == true) {
+                int sum = 1;
+                for (int j = i + 1; j < arr.length; j++) {
+                    if (arr[j] == arr[i]) {
+                        sum++;
+                    }
+                }
+                if (first == true) {
+                    System.out.print(arr[i] + "(" + sum + ")");
+                    first = false;
+                } else {
+                    System.out.print(", " + arr[i] + "(" + sum + ")");
+                }
+
+            }
+        }
+
+    }
+}
+

Java/1.5.java

@@ -0,0 +1,41 @@
+// EX 1.5. Write a program that accept an integer (n) from the user and outputs combinations that express n as a sum of two prime numbers.
+// Write a program that accept an integer (n) from the user and outputs combinations that express n as a sum of two prime numbers.
+
+// Example
+
+// Input: 10
+
+// Output: 7+3, 5+5
+import java.util.Scanner;
+
+public class Main {
+    private static boolean isPrime(int a) {
+        if ( a < 2) {
+            return false;
+        }
+        for ( int i = 2; i < a; i++) {
+            if ( a % i == 0) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        int a = scanner.nextInt();
+        boolean first = true;
+        for (int i = a -2; i >= a /2; i--) {
+            if ( isPrime(i) && isPrime(a-i)) {
+                if ( first == true) {
+                    first = false;
+                    System.out.print( i + "+" + (a - i));
+                }
+                else {
+                    System.out.print( ", " + i + "+" + (a - i));
+                }
+            }
+        }
+    }
+}
+

Java/1.6.java

@@ -0,0 +1,44 @@
+// EX 1.6 Write a program to check whether the sequence of numbers 1, 2, 3 appears in a given array of integers somewhere.
+// Write a program to check whether the sequence of numbers 1, 2, 3 appears in a given array of integers somewhere. 
+
+// Example
+// Input:
+//     5
+//     1 1 2 3 1
+// Output: 1
+// Please note that:
+//     5 as array size
+//     1 1 2 3 1 as array 
+
+import java.util.Scanner;
+
+/**
+ * array2
+ */
+public class Main {
+    public static boolean test(int[] a) {
+        for (int i = 0; i < a.length-2 ; i++) {
+            if (a[i] == 1 && a[i + 1] == 2 && a[i + i] == 3) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int n = sc.nextInt();
+        int[] a = new int[n];
+        for (int i = 0; i < n; i++) {
+            a[i] = sc.nextInt();
+        }
+        if (test(a)) {
+            System.out.print(0);
+        } else {
+            System.out.print(1);
+        }
+    }
+}
+
+
+

Java/1.7.java

@@ -0,0 +1,56 @@
+// EX 1.7 If a number appears three times in a row in an array it is called a triple. Write a program to check if a triple is presents in an array of integers or not.
+// If a value appears three times in a row in an array it is called a triple. Write a program to check if a triple is presents in an array of integers or not.
+
+// Example
+// Input:
+//     7
+//     1 1 1 2 2 2 1
+// Output:
+//     1
+
+// Please note that:
+
+// 7 as array size
+// 1 1 1 2 2 2 1 as array
+import java.util.Scanner;
+
+/**
+ * array2
+ */
+public class Main{
+    public static boolean test(int[] a, int n) {
+        for (int i = 0; i < n-1; i++) {
+            if (a[i] == a[i + 1] && a[i] == a[i + 2] && a[i + 1] == a[i + 2]) {
+                {
+                    return true;
+                }
+            }
+        }
+        return false;
+
+}
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int n = sc.nextInt();
+        int[] a = new int[n];
+        for (int i = 0; i < n; i++) {
+            a[i] = sc.nextInt();
+        }
+
+        if (test(a, n) == true) {
+            System.out.print(1);
+        } else {
+            System.out.print(0);
+        }
+        // for (int i = 0; i < a.length; i++) {
+        // System.out.print(a[i] + " ");
+        // }
+    }
+}
+
+
+
+
+
+
+