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ChooseTheNumber.java
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ChooseTheNumber.java
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package Baekjoon.TwoPointers;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.StringTokenizer;
// 24-04-22 50min
// https://www.acmicpc.net/problem/2230
public class ChooseTheNumber {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine());
int size = Integer.parseInt(st.nextToken());
int targetDifference = Integer.parseInt(st.nextToken());
int[] arr = new int[size];
for (int i = 0; i < size; i++) {
arr[i] = Integer.parseInt(br.readLine());
}
Arrays.sort(arr);
int startIdx = 0;
int endIdx = 1; // size==1 ?
int minDifference = Integer.
MAX_VALUE;
while (endIdx <= size - 1) {
int startValue = arr[startIdx];
int endValue = arr[endIdx];
int difference = endValue - startValue;
if (difference > targetDifference) {
// M보다 차이가 큰 경우, 왼쪽을 이동한다.
startIdx++;
minDifference = Math.min(minDifference, difference);
} else if (difference < targetDifference) {
// M보다 차이가 작은 경우, 오른쪽을
endIdx++;
} else {
// 같으면
minDifference = difference;
break;
}
}
System.out.println(minDifference);
}
}