打印一个字符串的所有排列？

z...zz..... 2010-12-17 07:33:43

打印一个字符串的所有排列？

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lost_guy_in_scut 2010-12-18

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String input = "abc";    //求a/b/c三个字符的全排列

        Set<String> results = new LinkedHashSet<String>();

        results.add("");

        for (int i=0; i<input.length(); i++)

            for (int j=0; j<input.length(); j++){

                String current = input.substring(j, j+1);

                Set<String> newones = new LinkedHashSet<String>();

                for(String s : results){

                    if (s.indexOf(current)==-1) s+=current;

                    newones.add(s);

                }

                results.addAll(newones);

            }

        for (String s: results)

            if (s.length()==input.length())System.out.println(s);

膜拜！

magong 2010-12-17

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俺也来贴一个



		String input = "abc";	//求a/b/c三个字符的全排列

		Set<String> results = new LinkedHashSet<String>();

		results.add("");

		for (int i=0; i<input.length(); i++)

			for (int j=0; j<input.length(); j++){

				String current = input.substring(j, j+1);

				Set<String> newones = new LinkedHashSet<String>();

				for(String s : results){

					if (s.indexOf(current)==-1) s+=current;

					newones.add(s);

				}

				results.addAll(newones);

			}

		for (String s: results)

			if (s.length()==input.length())System.out.println(s);

短一些，呵呵

fengke01242010 2010-12-17

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import java.util.Iterator;
import java.util.TreeSet;

public class Sort {

private String[] b = new String[] {"1","2","2","3","4","6"};

private int n = b.length;

private boolean[] visited = new boolean[n];

private int[][] a = new int[n][n];

private String result = "";

private TreeSet<String> set = new TreeSet<String>();

public static void main(String[] args) {
new Sort().start();
}

private void start() {

// Initial the map a[][]

for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
if (i == j) {
a[i][j] = 0;
} else {
a[i][j] = 1;
}
}
}

// 3 and 5 can not be the neighbor.

a[3][5] = 0;
a[5][3] = 0;

// Begin to depth search.

for (int i = 0; i < n; i++) {
this.depthFirstSearch(i);
}

// Print result treeset.

Iterator it = set.iterator();
while (it.hasNext()) {
String string = (String) it.next();
System.out.println(string);
}
}

private void depthFirstSearch(int startIndex) {
visited[startIndex] = true;
result = result + b[startIndex];
if (result.length() == n) {
// "4" can not be the third position.

if (result.indexOf(" 4 ") != 2) {
// Filt the duplicate value.

set.add(result);
}
}
for (int j = 0; j < n; j++) {
if (a[startIndex][j] == 1 && visited[j] == false) {
depthFirstSearch(j);
}
}

// restore the result value and visited value after listing a node.

result = result.substring(0, result.length() - 1);
visited[startIndex] = false;
}
}