Find the Missing sequence number from Array
Description : Find the missing number in sequence while user try to insert n number randomly into n -1 array. The complexity will be minimum
import java.util.Scanner;
/**
* @author +Jeevanantham R
*
*/
public class MissingNumber {
int inputArray[] = null;
int limit = 0;
private Scanner scanner = null;
private void getInput() {
scanner = new Scanner(System.in);
System.out.println(" Enter total number of elements ");
limit = scanner.nextInt();
int arraySize = limit-1;
System.out.println(" Array size :"+arraySize );
inputArray = new int[arraySize];
for(int i=0; i<arraySize; i++){
inputArray[i]= scanner.nextInt();
}
}
private void findingMissedOne() {
long startTime = System.currentTimeMillis();
int actualValue = (limit * (limit + 1))/2;
int arrayValue = 0;
for(int i : inputArray){
arrayValue = arrayValue + i;
}
System.out.println(" Missing value (from the randomly inserted array) : "+(actualValue - arrayValue));
System.out.println(" Execution time :"+(System.currentTimeMillis()- startTime)+" ms");
}
private void showArray() {
System.out.print(" Array members : ");
for (int i: inputArray) {
System.out.print(i+"\t");
}
}
public static void main(String[] args) {
MissingNumber missingNumber = new MissingNumber();
missingNumber.getInput();
missingNumber.findingMissedOne();
missingNumber.showArray();
}
}
How to find missing number in sequence |
Find missing number in an unordered sequential array
Akshay Agrawal
import java.io.*;
class MissingNumber
{
public static void main(String args[])throws IOException
{
BufferedReader b=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter the array size:");
int n=Integer.parseInt(b.readLine());
int a[]=new int[n];
System.out.println("Enter "+(n-1)+" array elements:");
int sum=0;
for(int i=0;i
{
a[i]=Integer.parseInt(b.readLine());
sum=sum+a[i];
}
int s=n*(n+1)/2;
int missing_number=s-sum;
long startTime = System.currentTimeMillis();
System.out.println("missing number in the from randomly inserted sequence="+missing_number);
System.out.println(" Execution time :"+(System.currentTimeMillis()- startTime)+" ms");
}
}
Thank you akshay agarwal for the above java code
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