Sometimes we need to find numeric digits or full numbers in strings. We can do this with both regular expressions or certain library functions. In this article, we’lluse regular expressions to find and extract numbers in strings. We’ll also cover some ways to count digits. 2. Counting Nu...
448. Find All Numbers Disappeared in an Array 448. Find All Numbers Disappeared in an Array 解法一:空间复杂度O(n)。思路:借助一个数组记录下某一数数否出现过。 思路:考虑到数组中数字的范围是1-n,可以看成是数组的index索引,改变所有出现的索引对应的数组的数值,然后判断那些仍未被改变。 下面第一...
Sample Solution: Java Code: importjava.util.HashSet;publicclassExample9{publicstaticvoidmain(String[]args){System.out.println("First 10 Happy numbers:");for(longnum=1,count=0;count<8;num++){if(happy_num(num)){System.out.println(num);count++;}}}publicstaticbooleanhappy_num(longnum){longm...
Seed Lychrel NumbersWrite a Java program to find the number of seed Lychrel number candidates and related numbers for n in the range 1..10000 inclusive. (With a 500-iteration limit).A Lychrel number is a natural number that cannot form a palindrome through the iterative process of repeatedly...
Take maximum of the two numbers and continue producing the multiples of this number until it is also the multiple of smaller number. Or there is another tedious method of finding prime factors of both numbers and union them. product of all union numbers gives you LCM. ...
JavaDuplicated2.java packagecom.mkyong;importjava.util.*;importjava.util.function.Function;importjava.util.stream.Collectors;publicclassJavaDuplicated2{publicstaticvoidmain(String[] args){// 3, 4, 9List<Integer> list = Arrays.asList(5,3,4,1,3,7,2,9,9,4); ...
publicList<Integer>findDisappearedNumbers(int[] nums){ List<Integer> list =newArrayList<Integer>();if(nums ==null|| nums.length <1) {returnlist; } Arrays.sort(nums);intindex = nums[0];if(index !=1) {for(intk=1; k<index; k++) { ...
Example 2: Program to find largest number among three numbers using nested if publicclassJavaExample{publicstaticvoidmain(String[]args){intnum1=10,num2=20,num3=7;if(num1>=num2){if(num1>=num3)/* This will only execute if conditions given in both ...
Learn to write program to find first N prime numbers using Java 8 Stream API, where N is any given input number to the application.
.containsexactly(7854.455, -3.0, 34.56); 5. finding other types of numbers numbers can be expressed in other formats, which we can detect by adjusting our regular expressions. 5.1. scientific notation let’s find some numbers formatted using scientific notation: string strtosearch = "xx1.25e-3...