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P3.java
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P3.java
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import java.util.*;
import java.io.*;
import java.util.ArrayList;
import java.util.Collections;
public class P3 {
public static ArrayList<Integer> nextPermutation(ArrayList<Integer> per) {
int n = per.size();
int i = n - 1;
int j = n - 1;
while (i > 0 && per.get(i) <= per.get(i - 1))
i--;
i = i - 1;
if (i == -1) {
Collections.reverse(per);
return per;
}
while (j > 0 && per.get(j) <= per.get(i)) {
j--;
}
// Swap i, j
int temp = per.get(i);
per.set(i, per.get(j));
per.set(j, temp);
// reverse from i+1
j = n - 1;
i = i + 1;
while (i < j) {
temp = per.get(i);
per.set(i, per.get(j));
per.set(j, temp);
i++;
j--;
}
return per;
}
}