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backtracking_10819_maxSubtract.java
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backtracking_10819_maxSubtract.java
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package backtracking;
import java.io.*;
import java.util.StringTokenizer;
public class backtracking_10819_maxSubtract {
static int N;
static int[] arr;
static boolean[] visit;
static int ans = -801;
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
N = Integer.parseInt(br.readLine());
arr = new int[N];
visit = new boolean[N];
StringTokenizer st = new StringTokenizer(br.readLine());
for (int i = 0; i < N; i++) {
arr[i] = Integer.parseInt(st.nextToken());
}
backtracking(0, 0, -1);
bw.write(ans + "");
bw.close();
br.close();
}
static void backtracking(int sum, int cnt, int preIdx) {
if (cnt == N) {
ans = Math.max(ans, sum);
return;
}
for (int i = 0; i < N; i++) {
if (visit[i]) continue;
visit[i] = true;
if (preIdx != -1) {
backtracking(sum + Math.abs(arr[i] - arr[preIdx]), cnt + 1, i);
} else {
backtracking(sum, cnt + 1, i);
}
visit[i] = false;
}
}
}