4882 caratteri - Java
Non è una soluzione molto golf (ovvero 4800 caratteri è un lotttttttttttt) Potrebbe essere giocato un po 'più a golf in quanto 1 o 2 linee di debug sono ancora lì. Penso di poter ridurre ancora un po 'in termini di codice inutile / ottimizzato.
import java.util.*;import java.awt.Point;public class G{public static void main(String[]args){new G();}Scanner z=new Scanner(System.in);public G(){s=z.nextInt();z.nextLine();int g[][]=new int[s][s];for(int i=0;i<s;i++)Arrays.fill(g[i],-1);for(int i=0;i<s;i++){String line=z.nextLine();for(int j=0;j<s;j++)if(line.charAt(j)!='.')g[i][j]=Integer.parseInt(Character.toString(line.charAt(j)));}System.out.println();if(y(g)){for(int i=0;i<s;i++)for(int j=0;j<s;j++)System.out.print(g[i][j]);System.out.println();}else System.out.println(0);}private boolean x(Collection<Point>c,int[][]d){if(c.size()==0)return true;int j=0;for(Iterator<Point>k=c.iterator();k.hasNext();k.next(),j++){for(int sol=9;sol>=0;sol--){int[][]a=new int[s][s];for(int i=0;i<s;i++)a[i]=Arrays.copyOf(d[i],s);List<Point>b=new ArrayList<Point>();for(Point p:c)if(!b.contains(p))b.add(new Point(p));a[b.get(j).x][b.get(j).y]=sol;if(w(a,b.get(j))){if(x(b,a)){for(int i=0;i<s;i++)d[i]=Arrays.copyOf(a[i],s);c.clear();c.addAll(b);return true;}}}}return false;}int s;private boolean y(int[][]d){int[][] a=new int[s][s];for (int i = 0; i<s;i++)a[i]=Arrays.copyOf(d[i],s);List<Point> incomplete=new ArrayList<Point>();if(r(a)&&s(a)){a(a);System.exit(0);}else if(!r(a)){q("INVALID FROM MAIN, ",12);return false;}for(int i=0;i<s;i++)for(int j=0;j<s;j++){if(a[i][j]!=-1)if(t(new Point(i,j),a,null,a[i][j]).size()!=a[i][j]){if(w(a,new Point(i,j))){a(a);if(y(a)){for(int i=0;i<s;i++)d[i]=Arrays.copyOf(a[i],s);return true;}else return false;}else return false;}}for(int i=0;i<s;i++)for(int j=0;j<s;j++)if(a[i][j]==-1){Set<Point>c=t(new Point(i,j),a,null,-1);if(x(c,a)){if(y(a)){for(int i=0;i<s;i++)d[i] = Arrays.copyOf(a[i], s);return true;}else return false;}else return false;}q("How did you get here",1);return false;}private boolean w(int[][]d,Point b){List<Point>c;Set<Point>a;a=t(b,d,null,d[b.x][b.y]);c=new ArrayList<Point>(u(b,d,null,d[b.x][b.y]));int h=d[b.x][b.y];int g=h-a.size();if(c.size()<g){return false;}else if(v(c,h,h,new ArrayList<Point>(a),0,d))return true;else return false;}private boolean v(List<Point>c,int h,int g,List<Point>e,int f,int[][]d){if(e==null)e=new ArrayList<Point>();int[][]a=new int[s][s];for(int i=0;i<s;i++)for(int k=0;k<s;k++)a[i][k]=d[i][k];if(f<g&&e.size()<g){for(int i=0;i<c.size();i++){if(!e.contains(c.get(i))){if(d[c.get(i).x][c.get(i).y]==h){for(Point c:e){a[c.x][c.y]=h;}Set<Point> u=t(e.get(0),a,null,h);Set<Point>v=t(c.get(i),a,null,h);if(!Collections.disjoint(u,v)){u.addAll(v);List<Point>uList=new ArrayList<Point>(u);if(v(c,h,g,uList,f+1,a)){q("this e sucess",2);if(y(d)){e.addAll(uList);return true;}}else;}for(int l=0;l<s;l++)for(int k=0;k<s;k++)a[l][k]=d[l][k];}else if(e.add(c.get(i))){if(v(c,h,g,e,f+1,d)){q("this e sucess",2);if(y(d))return true;}}if(e.contains(c.get(i)))e.remove(c.get(i));}}return false;}else if(f>g||e.size()>g){if(f>g){q("Your over the g. ");return false;}else return false;}else{for(Point c:e){a[c.x][c.y]=h;}if(r(a)){if(y(a)){for(int i=0;i<s;i++)d[i]=Arrays.copyOf(a[i],s);q("complete(a) is true, ",4);return true;}else{return false;}}else{return false;}}}private void q(String out,int i){System.err.println(out+". exit code: "+i);System.exit(i);}private void q(String a){q(a,0);}private boolean r(int[][] d){for(int i=0;i<s;i++)for(int j=0;j<s;j++)if(d[i][j]!=-1){Set<Point>same=t(new Point(i,j),d,null,d[i][j]);if(same.size()>d[i][j]){return false;}Set<Point>fae=u(new Point(i,j),d,null,d[i][j]);if(u(new Point(i,j),d,null,d[i][j]).size()<d[i][j]){return false;}}return true;}private Set<Point> u(Point p,int[][]d,Set<Point>u,int i){u=(u==null)?new HashSet<Point>():u;if(d[p.x][p.y]==i||d[p.x][p.y]==-1)u.add(p);int x=p.x,y=p.y;Point t=new Point();if(x+1<s&&(d[x+1][y]==i||d[x+1][y]==-1)){if(u.add(new Point(x+1,y)))u=u(new Point(x+1,y),d,u,i);}if(y+1<s&&(d[x][y+1]==i||d[x][y+1]==-1)){if(u.add(new Point(x,y+1)))u=u(new Point(x,y+1),d,u,i);}if(x-1>=0&&(d[x-1][y]==i||d[x-1][y]==-1)){if(u.add(new Point(x-1,y)))u=u(new Point(x-1,y),d,u,i);}if(y-1>=0&&(d[x][y-1]==i||d[x][y-1]==-1)){if(u.add(new Point(x,y-1)))u=u(new Point(x,y-1),d,u,i);}return u;}private Set<Point> t(Point p,int[][]d,Set<Point>u,int i){u=(u==null)?new HashSet<Point>():u;if(d[p.x][p.y]==i)u.add(p);int x=p.x,y=p.y;Point t=new Point(p);if(x+1<s&&d[x+1][y]==i){if(u.add(new Point(x+1,y)))u=t(new Point(x+1,y),d,u,i);}if(y+1<s&&d[x][y+1]==i){if(u.add(new Point(x,y+1)))u=t(new Point(x,y+1),d,u,i);}if(x-1>=0&&d[x-1][y]==i){if(u.add(new Point(x-1,y)))u=t(new Point(x-1,y),d,u,i);}if(y-1>=0&&d[x][y-1]==i){if(u.add(new Point(x,y-1)))u=t(new Point(x,y-1),d,u,i);}return u;}private boolean s(int[][]d){for(int i=0;i<s;i++)for(int j=0;j<s;j++)if(t(new Point(i,j),d,null,d[i][j]).size()!=d[i][j])return false;return true;}private void a(int[][]d){for(int i=0;i<s;i++){for(int j=0;j<s;j++){System.out.printf("%1s",d[i][j]==-1?".":Integer.toString(d[i][j]));}System.out.println("");}}}
Non avendo mai visto prima i Polyominoes, ho letto cosa sono e senza guardare alla risoluzione degli alrogitmi ho inventato il mio (abbastanza lentamente).
Fondamentalmente, usa molto la ricorsione ... Trova un Polyomino incompleto, cerca di completarlo. Trova uno spazio vuoto, passa da 1 a 9 attraverso tutti i quadrati della tasca, imposta quella tasca su quel valore. Se la tasca è completa, prova a trovare un'altra tasca, quindi si ripete fino al termine. Non sono riuscito a farlo funzionare per una griglia di dimensioni 9 ... Ho in mente almeno un'ottimizzazione che potrebbe farlo funzionare entro un tempo ragionevole per 9. Potrebbe provare a metterlo in atto presto.