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SwapToMax.java
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73 lines (57 loc) · 1.69 KB
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import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
class SwapToMax {
public static void main(String[] args) {
System.out.println(swap("876959", 3));
}
private static String swap(String value, int k) {
return swapToMax(Arrays.asList(value), k, 0);
}
private static String swapToMax(List<String> values, int k, int level) {
if (k == 0) {
return Collections.max(values, new Comparator<String>() {
@Override
public int compare(String o1, String o2) {
int i = Integer.parseInt(o1);
int j = Integer.parseInt(o2);
return Integer.compare(i, j);
}
});
} else {
List<String> newValues = new ArrayList<>();
for (String string : values) {
List<Integer> maxLocations = maxLocations(string, level);
for (Integer integer : maxLocations) {
newValues.add(swap(string, integer, level));
}
}
return swapToMax(newValues, k - 1, level + 1);
}
}
private static String swap(String string, Integer integer, int level) {
StringBuilder sb = new StringBuilder(string);
char temp = sb.charAt(integer);
sb.setCharAt(integer, string.charAt(level));
sb.setCharAt(level, temp);
return sb.toString();
}
private static List<Integer> maxLocations(String string, int start) {
char[] array = string.toCharArray();
List<Integer> maxLocations = new ArrayList<>();
maxLocations.add(start);
char max = array[start];
for (int i = start + 1; i < array.length; i++) {
if (array[i] == max) {
maxLocations.add(i);
} else if (array[i] > max) {
maxLocations.clear();
maxLocations.add(i);
max = array[i];
}
}
return maxLocations;
}
}