import java.util.*;
import java.util.zip.*;
import java.util.List;
import java.util.regex.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.*;
import java.util.concurrent.locks.*;
import java.util.function.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.table.*;
import java.io.*;
import java.net.*;
import java.lang.reflect.*;
import java.lang.ref.*;
import java.lang.management.*;
import java.security.*;
import java.security.spec.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.awt.geom.*;
import javax.imageio.*;
import java.math.*;
import static x30_pkg.x30_util.DynamicObject;
import java.awt.geom.*;
class main {
static class G22SkeletonWalker implements Steppable , IFieldsToList{
IImageRegion region;
G22SkeletonWalker() {}
G22SkeletonWalker(IImageRegion region) {
this.region = region;}
public String toString() { return shortClassName_dropNumberPrefix(this) + "(" + region + ")"; }public Object[] _fieldsToList() { return new Object[] {region}; }
transient Set> onFoundLink;
public G22SkeletonWalker onFoundLink(IVF2 f) { onFoundLink = createOrAddToSyncLinkedHashSet(onFoundLink, f); return this; }
public G22SkeletonWalker removeFoundLinkListener(IVF2 f) { main.remove(onFoundLink, f); return this; }
public void foundLink(Pt a, Pt b) { pcallFAll(onFoundLink, a, b); }
// point to "registered" point close by
Map ptMap = new HashMap();
// TEMPORARY DATA
boolean initialized = false;
// each pair is (registered point, point-to-explore)
LinkedList> queue = new LinkedList();
public boolean step() {
// find first pixel
if (!initialized) {
initialized = true;
Pt p = region.firstPixel();
if (p == null) return false;
queue.add(pair(null, p));
}
if (empty(queue)) return false;
Pair pair = popFirst(queue);
Pt prev = pair.a, p = pair.b;
Pt mapped = lookupOrKeep(ptMap, p);
boolean seen = ptMap.containsKey(p);
Pt mapTo = p;
if (prev != null) {
if (distantEnough(prev, mapped))
foundLink(prev, mapped);
else
mapTo = prev;
}
if (!seen) {
ptMap.put(p, mapTo);
Pt linkFrom = or(prev, p);
for (int dir = 1; dir <= 8; dir++) {
Pt p2 = ptPlus(p, onePathDirection(dir));
if (region.contains(p2))
queue.add(pair(linkFrom, p2));
}
}
return true;
}
boolean distantEnough(Pt a, Pt b) {
return a != null && b != null
&& (absDiff(a.x, b.x) >= 2 || absDiff(a.y, b.y) >= 2);
}
}
static String shortClassName_dropNumberPrefix(Object o) {
return dropNumberPrefix(shortClassName(o));
}
static Set createOrAddToSyncLinkedHashSet(Set set, A a) {
if (set == null) set = syncLinkedHashSet();
set.add(a);
return set;
}
static void remove(List l, int i) {
if (l != null && i >= 0 && i < l(l))
l.remove(i);
}
static void remove(Collection l, A a) {
if (l != null) l.remove(a);
}
static B remove(Map map, Object a) {
return map == null ? null : map.remove(a);
}
static void remove(BitSet bs, int i) {
bs.clear(i);
}
static void pcallFAll(Collection l, Object... args) {
if (l != null) for (Object f : cloneList(l)) pcallF(f, args);
}
static void pcallFAll(Iterator it, Object... args) {
while (it.hasNext()) pcallF(it.next(), args);
}
static Pair pair(A a, B b) {
return new Pair(a, b);
}
static Pair pair(A a) {
return new Pair(a, a);
}
static boolean empty(Collection c) { return c == null || c.isEmpty(); }
static boolean empty(Iterable c) { return c == null || !c.iterator().hasNext(); }
static boolean empty(CharSequence s) { return s == null || s.length() == 0; }
static boolean empty(Map map) { return map == null || map.isEmpty(); }
static boolean empty(Object[] o) { return o == null || o.length == 0; }
static boolean empty(BitSet bs) { return bs == null || bs.isEmpty(); }
static boolean empty(Object o) {
if (o instanceof Collection) return empty((Collection) o);
if (o instanceof String) return empty((String) o);
if (o instanceof Map) return empty((Map) o);
if (o instanceof Object[]) return empty((Object[]) o);
if (o instanceof byte[]) return empty((byte[]) o);
if (o == null) return true;
throw fail("unknown type for 'empty': " + getType(o));
}
static boolean empty(Iterator i) { return i == null || !i.hasNext(); }
static boolean empty(double[] a) { return a == null || a.length == 0; }
static boolean empty(float[] a) { return a == null || a.length == 0; }
static boolean empty(int[] a) { return a == null || a.length == 0; }
static boolean empty(long[] a) { return a == null || a.length == 0; }
static boolean empty(byte[] a) { return a == null || a.length == 0; }
static boolean empty(short[] a) { return a == null || a.length == 0; }
static boolean empty(IMultiMap mm) { return mm == null || mm.size() == 0; }
static boolean empty(File f) { return getFileSize(f) == 0; }
static boolean empty(Rect r) { return !(r != null && r.w != 0 && r.h != 0); }
static boolean empty(AppendableChain c) { return c == null; }
static A popFirst(List l) {
if (empty(l)) return null;
A a = first(l);
l.remove(0);
return a;
}
static A popFirst(Collection l) {
if (empty(l)) return null;
A a = first(l);
l.remove(a);
return a;
}
static Pair popFirst(Map map) {
if (map == null) return null;
var it = map.entrySet().iterator();
if (!it.hasNext()) return null;
var p = mapEntryToPair(it.next());
it.remove();
return p;
}
static List popFirst(int n, List l) {
List part = cloneSubList(l, 0, n);
removeSubList(l, 0, n);
return part;
}
static AppendableChain popFirst(AppendableChain a) {
return a == null ? null : a.popFirst();
}
static A lookupOrKeep(Map map, A key) {
return map != null && map.containsKey(key) ? map.get(key) : key;
}
static A or(A a, A b) {
return a != null ? a : b;
}
static Pt ptPlus(Pt a, Pt b) {
return addPts(a, b);
}
static Pt onePathDirection(int index) {
return onePathDirections()[index];
}
static int absDiff(int a, int b) {
return abs(a-b);
}
static double absDiff(double a, double b) {
return abs(a-b);
}
static String dropNumberPrefix(String s) {
return dropFirst(s, indexOfNonDigit(s));
}
static String shortClassName(Object o) {
if (o == null) return null;
Class c = o instanceof Class ? (Class) o : o.getClass();
String name = c.getName();
return shortenClassName(name);
}
static Set syncLinkedHashSet() {
return synchroLinkedHashSet();
}
static int l(Object[] a) { return a == null ? 0 : a.length; }
static int l(boolean[] a) { return a == null ? 0 : a.length; }
static int l(byte[] a) { return a == null ? 0 : a.length; }
static int l(short[] a) { return a == null ? 0 : a.length; }
static int l(long[] a) { return a == null ? 0 : a.length; }
static int l(int[] a) { return a == null ? 0 : a.length; }
static int l(float[] a) { return a == null ? 0 : a.length; }
static int l(double[] a) { return a == null ? 0 : a.length; }
static int l(char[] a) { return a == null ? 0 : a.length; }
static int l(Collection c) { return c == null ? 0 : c.size(); }
static int l(Iterator i) { return iteratorCount_int_close(i); } // consumes the iterator && closes it if possible
static int l(Map m) { return m == null ? 0 : m.size(); }
static int l(CharSequence s) { return s == null ? 0 : s.length(); }
static long l(File f) { return f == null ? 0 : f.length(); }
static int l(IMultiMap mm) { return mm == null ? 0 : mm.size(); }
static int l(AppendableChain a) { return a == null ? 0 : a.size; }
static ArrayList cloneList(Iterable l) {
return l instanceof Collection ? cloneList((Collection) l) : asList(l);
}
static ArrayList cloneList(Collection l) {
if (l == null) return new ArrayList();
synchronized(collectionMutex(l)) {
return new ArrayList(l);
}
}
static Object pcallF(Object f, Object... args) {
return pcallFunction(f, args);
}
static A pcallF(F0 f) {
try { return f == null ? null : f.get(); } catch (Throwable __e) { printStackTrace(__e); } return null;
}
static B pcallF(F1 f, A a) {
try { return f == null ? null : f.get(a); } catch (Throwable __e) { printStackTrace(__e); } return null;
}
static void pcallF(VF1 f, A a) {
try {
{ if (f != null) f.get(a); }
} catch (Throwable __e) { printStackTrace(__e); }
}
static Object pcallF(Runnable r) {
try { { if (r != null) r.run(); } } catch (Throwable __e) { printStackTrace(__e); } return null;
}
static A pcallF(IF0 f) {
try { return f == null ? null : f.get(); } catch (Throwable __e) { printStackTrace(__e); } return null;
}
static B pcallF(IF1 f, A a) {
try { return f == null ? null : f.get(a); } catch (Throwable __e) { printStackTrace(__e); } return null;
}
static RuntimeException fail() { throw new RuntimeException("fail"); }
static RuntimeException fail(Throwable e) { throw asRuntimeException(e); }
static RuntimeException fail(Object msg) { throw new RuntimeException(String.valueOf(msg)); }
static RuntimeException fail(Object... objects) { throw new Fail(objects); }
static RuntimeException fail(String msg) { throw new RuntimeException(msg == null ? "" : msg); }
static RuntimeException fail(String msg, Throwable innerException) { throw new RuntimeException(msg, innerException); }
static String getType(Object o) {
return getClassName(o);
}
static long getFileSize(String path) {
return path == null ? 0 : new File(path).length();
}
static long getFileSize(File f) {
return f == null ? 0 : f.length();
}
static Object first(Object list) {
return first((Iterable) list);
}
static A first(List list) {
return empty(list) ? null : list.get(0);
}
static A first(A[] bla) {
return bla == null || bla.length == 0 ? null : bla[0];
}
static Pair first(Map map) {
return mapEntryToPair(first(entrySet(map)));
}
static Pair first(MultiMap mm) {
if (mm == null) return null;
var e = first(mm.data.entrySet());
if (e == null) return null;
return pair(e.getKey(), first(e.getValue()));
}
static A first(IterableIterator i) {
return first((Iterator) i);
}
static A first(Iterator i) {
return i == null || !i.hasNext() ? null : i.next();
}
static A first(Iterable i) {
if (i == null) return null;
Iterator it = i.iterator();
return it.hasNext() ? it.next() : null;
}
static Character first(String s) { return empty(s) ? null : s.charAt(0); }
static Character first(CharSequence s) { return empty(s) ? null : s.charAt(0); }
static A first(Pair p) {
return p == null ? null : p.a;
}
static Byte first(byte[] l) {
return empty(l) ? null : l[0];
}
static A first(A[] l, IF1 pred) {
return firstThat(l, pred);
}
static A first(Iterable l, IF1 pred) {
return firstThat(l, pred);
}
static A first(IF1 pred, Iterable l) {
return firstThat(pred, l);
}
static A first(AppendableChain a) {
return a == null ? null : a.element;
}
static Pair mapEntryToPair(Map.Entry e) {
return e == null ? null : pair(e.getKey(), e.getValue());
}
static List cloneSubList(List l, int startIndex, int endIndex) {
return newSubList(l, startIndex, endIndex);
}
static List cloneSubList(List l, int startIndex) {
return newSubList(l, startIndex);
}
static void removeSubList(List l, int from, int to) {
if (l != null) subList(l, from, to).clear();
}
static void removeSubList(List l, int from) {
if (l != null) subList(l, from).clear();
}
static Pt addPts(Pt a, Pt b) {
return a == null ? b : b == null ? a : new Pt(a.x+b.x, a.y+b.y);
}
static final Pt[] onePathDirections_directions = {
pt(0, 0),
pt(-1, -1),
pt(0, -1),
pt(1, -1),
pt(1, 0),
pt(1, 1),
pt(0, 1),
pt(-1, 1),
pt(-1, 0)
};
static Pt[] onePathDirections() { return onePathDirections_directions; }
static float abs(float f) { return Math.abs(f); }
static int abs(int i) { return Math.abs(i); }
static double abs(double d) { return Math.abs(d); }
static String[] dropFirst(int n, String[] a) {
return drop(n, a);
}
static String[] dropFirst(String[] a) {
return drop(1, a);
}
static Object[] dropFirst(Object[] a) {
return drop(1, a);
}
static List dropFirst(List l) {
return dropFirst(1, l);
}
static List dropFirst(int n, Iterable i) { return dropFirst(n, toList(i)); }
static List dropFirst(Iterable i) { return dropFirst(toList(i)); }
static List dropFirst(int n, List l) {
return n <= 0 ? l : new ArrayList(l.subList(Math.min(n, l.size()), l.size()));
}
static List dropFirst(List l, int n) {
return dropFirst(n, l);
}
static String dropFirst(int n, String s) { return substring(s, n); }
static String dropFirst(String s, int n) { return substring(s, n); }
static String dropFirst(String s) { return substring(s, 1); }
static int indexOfNonDigit(String s) {
int n = l(s);
for (int i = 0; i < n; i++)
if (!isDigit(s.charAt(i)))
return i;
return -1;
}
static String shortenClassName(String name) {
if (name == null) return null;
int i = lastIndexOf(name, "$");
if (i < 0) i = lastIndexOf(name, ".");
return i < 0 ? name : substring(name, i+1);
}
// BREAKING CHANGE!
// Also NOTE: Iterators of these sync-wrapped collections
// after generally NOT thread-safe!
// TODO: change that?
static Set synchroLinkedHashSet() {
return Collections.synchronizedSet(new CompactLinkedHashSet());
}
static int iteratorCount_int_close(Iterator i) { try {
int n = 0;
if (i != null) while (i.hasNext()) { i.next(); ++n; }
if (i instanceof AutoCloseable) ((AutoCloseable) i).close();
return n;
} catch (Exception __e) { throw rethrow(__e); } }
// unclear semantics as to whether return null on null
static ArrayList asList(A[] a) {
return a == null ? new ArrayList() : new ArrayList(Arrays.asList(a));
}
static ArrayList asList(int[] a) {
if (a == null) return null;
ArrayList l = emptyList(a.length);
for (int i : a) l.add(i);
return l;
}
static ArrayList asList(long[] a) {
if (a == null) return null;
ArrayList l = emptyList(a.length);
for (long i : a) l.add(i);
return l;
}
static ArrayList asList(float[] a) {
if (a == null) return null;
ArrayList l = emptyList(a.length);
for (float i : a) l.add(i);
return l;
}
static ArrayList asList(double[] a) {
if (a == null) return null;
ArrayList l = emptyList(a.length);
for (double i : a) l.add(i);
return l;
}
static ArrayList asList(short[] a) {
if (a == null) return null;
ArrayList l = emptyList(a.length);
for (short i : a) l.add(i);
return l;
}
static ArrayList asList(Iterator it) {
ArrayList l = new ArrayList();
if (it != null)
while (it.hasNext())
l.add(it.next());
return l;
}
// disambiguation
static ArrayList asList(IterableIterator s) {
return asList((Iterator) s);
}
static ArrayList asList(Iterable s) {
if (s instanceof ArrayList) return (ArrayList) s;
ArrayList l = new ArrayList();
if (s != null)
for (A a : s)
l.add(a);
return l;
}
static ArrayList asList(Enumeration e) {
ArrayList l = new ArrayList();
if (e != null)
while (e.hasMoreElements())
l.add(e.nextElement());
return l;
}
static List asList(Pair p) {
return p == null ? null : ll(p.a, p.b);
}
// TODO: JDK 17!! ?? No! Yes? Yes!!
static Object collectionMutex(List l) {
return l;
}
static Object collectionMutex(Object o) {
if (o instanceof List) return o;
// TODO: actually use our own maps so we can get the mutex properly
String c = className(o);
return o;
}
static Object pcallFunction(Object f, Object... args) {
try { return callFunction(f, args); } catch (Throwable __e) { printStackTrace(__e); }
return null;
}
static A printStackTrace(A e) {
// we go to system.out now - system.err is nonsense
if (e != null) print(getStackTrace(e));
return e;
}
static void printStackTrace() {
printStackTrace(new Throwable());
}
static void printStackTrace(String msg) {
printStackTrace(new Throwable(msg));
}
static void printStackTrace(String msg, Throwable e) {
printStackTrace(new Throwable(msg, e));
}
static RuntimeException asRuntimeException(Throwable t) {
if (t instanceof Error)
_handleError((Error) t);
return t instanceof RuntimeException ? (RuntimeException) t : new RuntimeException(t);
}
static String getClassName(Object o) {
return o == null ? "null" : o instanceof Class ? ((Class) o).getName() : o.getClass().getName();
}
static Set> entrySet(Map map) {
return _entrySet(map);
}
static A firstThat(Iterable l, IF1 pred) {
for (A a : unnullForIteration(l))
if (pred.get(a))
return a;
return null;
}
static A firstThat(A[] l, IF1 pred) {
for (A a : unnullForIteration(l))
if (pred.get(a))
return a;
return null;
}
static A firstThat(IF1 pred, Iterable l) {
return firstThat(l, pred);
}
static A firstThat(IF1 pred, A[] l) {
return firstThat(l, pred);
}
static List newSubList(List l, int startIndex, int endIndex) {
return cloneList(subList(l, startIndex, endIndex));
}
static List newSubList(List l, int startIndex) {
return cloneList(subList(l, startIndex));
}
static List subList(List l, int startIndex) {
return subList(l, startIndex, l(l));
}
static List subList(int startIndex, List l) {
return subList(l, startIndex);
}
static List subList(int startIndex, int endIndex, List l) {
return subList(l, startIndex, endIndex);
}
static List subList(List l, int startIndex, int endIndex) {
if (l == null) return null;
int n = l(l);
startIndex = Math.max(0, startIndex);
endIndex = Math.min(n, endIndex);
if (startIndex > endIndex) return ll();
if (startIndex == 0 && endIndex == n) return l;
return l.subList(startIndex, endIndex);
}
static Pt pt(int x, int y) {
return new Pt(x, y);
}
static Pt pt(int x) {
return new Pt(x, x);
}
static String[] drop(int n, String[] a) {
n = Math.min(n, a.length);
String[] b = new String[a.length-n];
System.arraycopy(a, n, b, 0, b.length);
return b;
}
static Object[] drop(int n, Object[] a) {
n = Math.min(n, a.length);
Object[] b = new Object[a.length-n];
System.arraycopy(a, n, b, 0, b.length);
return b;
}
static ArrayList toList(A[] a) { return asList(a); }
static ArrayList toList(int[] a) { return asList(a); }
static ArrayList toList(Set s) { return asList(s); }
static ArrayList toList(Iterable s) { return asList(s); }
static String substring(String s, int x) {
return substring(s, x, strL(s));
}
static String substring(String s, int x, int y) {
if (s == null) return null;
if (x < 0) x = 0;
int n = s.length();
if (y < x) y = x;
if (y > n) y = n;
if (x >= y) return "";
return s.substring(x, y);
}
// convenience method for quickly dropping a prefix
static String substring(String s, CharSequence l) {
return substring(s, lCharSequence(l));
}
static boolean isDigit(char c) {
return Character.isDigit(c);
}
static int lastIndexOf(String a, String b) {
return a == null || b == null ? -1 : a.lastIndexOf(b);
}
static int lastIndexOf(String a, char b) {
return a == null ? -1 : a.lastIndexOf(b);
}
// starts searching from i-1
static int lastIndexOf(List l, int i, A a) {
if (l == null) return -1;
for (i = min(l(l), i)-1; i >= 0; i--)
if (eq(l.get(i), a))
return i;
return -1;
}
static int lastIndexOf(List l, A a) {
if (l == null) return -1;
for (int i = l(l)-1; i >= 0; i--)
if (eq(l.get(i), a))
return i;
return -1;
}
static RuntimeException rethrow(Throwable t) {
if (t instanceof Error)
_handleError((Error) t);
throw t instanceof RuntimeException ? (RuntimeException) t : new RuntimeException(t);
}
static RuntimeException rethrow(String msg, Throwable t) {
throw new RuntimeException(msg, t);
}
static ArrayList emptyList() {
return new ArrayList();
//ret Collections.emptyList();
}
static ArrayList emptyList(int capacity) {
return new ArrayList(max(0, capacity));
}
// Try to match capacity
static ArrayList emptyList(Iterable l) {
return l instanceof Collection ? emptyList(((Collection) l).size()) : emptyList();
}
static ArrayList emptyList(Object[] l) {
return emptyList(l(l));
}
// get correct type at once
static ArrayList emptyList(Class c) {
return new ArrayList();
}
static List ll(A... a) {
ArrayList l = new ArrayList(a.length);
if (a != null) for (A x : a) l.add(x);
return l;
}
static String className(Object o) {
return getClassName(o);
}
static Object callFunction(Object f, Object... args) {
return callF(f, args);
}
static volatile StringBuffer local_log = new StringBuffer(); // not redirected
static boolean printAlsoToSystemOut = true;
static volatile Appendable print_log = local_log; // might be redirected, e.g. to main bot
// in bytes - will cut to half that
static volatile int print_log_max = 1024*1024;
static volatile int local_log_max = 100*1024;
static boolean print_silent = false; // total mute if set
static Object print_byThread_lock = new Object();
static volatile ThreadLocal