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Copy pathDuplicateNumber.java
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33 lines (27 loc) · 857 Bytes
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package com.sky.pgm;
import java.util.ArrayList;
import java.util.List;
public class DuplicateNumber {
public int findDuplicateNumber(List<Integer> numbers){
int highestNumber = numbers.size() - 1;
int total = getSum(numbers);
int duplicate = total - (highestNumber*(highestNumber+1)/2);
return duplicate;
}
public int getSum(List<Integer> numbers){
int sum = 0;
for(int num:numbers){
sum += num;
}
return sum;
}
public static void main(String[] args) {
List<Integer> numbers = new ArrayList<Integer>();
for (int i = 1; i < 30; i++) {
numbers.add(i);
}
numbers.add(19);
DuplicateNumber dn = new DuplicateNumber();
System.out.println("Duplicate Number "+dn.findDuplicateNumber(numbers));
}
}