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Fibonacci und 8 Damen

Main.java

@@ -1,6 +1,151 @@
+// Press Shift twice to open the Search Everywhere dialog and type `show whitespaces`,
+// then press Enter. You can now see whitespace characters in your code.
 public class Main {
-    public static void main(String[] args) {
+    public static long Fibonacci_Iter(int num){
-        System.out.println("Brutaler Text der Beweis dafür ist, dass es geklappt hat");
+        long smol = 1;
+        long big = 1;
+        long temp;
 
+        while (1 < num){
+            temp = smol;
+            smol = big;
+            big = big + temp;
+            num--;
+        }
+        return big;
+    }
+    public static long Fibonacci_Rec(int num){
+
+        // Inputqualität
+        if(num < 0){
+           System.out.println("Ungültiger Input");
+           return 0;
+       }
+
+       if(num < 2){
+           return 1;
+       }
+
+       return Fibonacci_Rec(num-2) + Fibonacci_Rec(num-1);
+    }
+    public static long Fibonacci_Round(int num){
+        long result = 1;
+        if(num==0 || num==1){return 1;}
+        for(int i=1; i<num; i++){result = Math.round(result*1.61803398875);}
+        return result;
+    }
+    public static void QueensPlace(int field[][],int row, int col){
+
+        // block spaces
+        for (int i=0; i<8; i++){
+            // block row and col
+            field[i][col]=3;
+            field[row][i]=3;
+
+            // block diagonals
+            // Left 2 Right, Top 2 Bottom
+            if (row - col + i < 8 && row - col + i >= 0) {
+                field[row-col + i][i]=3;
+            }
+
+            // Left 2 Right, Bottom 2 Top
+            if(row+i < 8 && row+i >=0 && col-i < 8 && col-i >=0){
+                field[row+i][col-i]=3;
+            }
+            if(row-i < 8 && row-i >=0 && col+i < 8 && col+i >=0){
+                field[row-i][col+i]=3;
+            }
+        }
+        // place queen
+        field[row][col]=1;
+    }
+    public static boolean QueensFree(int field[][], int row, int col){
+        return field[row][col] == 0;
+    }
+    public static void QueensPrint(int field[][]){
+        // print field
+        System.out.println("---------------");
+        for(int i=0; i<field.length; i++){
+            for(int j=0; j<field[i].length; j++) {
+                System.out.print(field[i][j]+" ");
+            }
+            System.out.println();
+        }
+        System.out.println("---------------");
+        System.out.println();
+    }
+    public static int[][] QueensSetup(int rows, int cols){
+
+        int field[][] = new int[rows][cols];
+        for(int i = 0; i < rows-1; i++){
+            for(int j = 0; j < cols-1; j++){
+                field[i][j]=0;
+            }
+        }
+    return field;
+    }
+    public static void QueensMain(){
+        int rows=8;
+        int cols=8;
+        int start_queens=8;
+        int queens = start_queens;
+        int field[][] = QueensSetup(rows,cols);
+        int wrong[][] = new int[8][8];
+
+
+        while(queens>0){
+            boolean full = true;
+            for(int i=0;i<rows;i++){
+                for(int j=0;j<cols;j++){
+                    if(QueensFree(field,i,j)){
+                        QueensPlace(field,i,j);
+                        queens--;
+                        full = false;
+                    }
+                }
+            }
+            System.out.println("Lösungsversuch: ");
+            QueensPrint(field);
+            if(full){
+
+                // current Queens as wrong for next time
+                 for (int i=0; i<8; i++){
+                   for(int j=0; j<8; j++){
+                       if(field[i][j]==1){
+                           wrong[i][j]=3;
+                       }
+                   }
+                 }
+                 // reset
+                 field = QueensSetup(rows,cols);
+                 queens = start_queens;
+
+                 // block earlier wrongs
+                 for(int i = 0; i<8; i++){
+                     for(int j = 0; j<8; j++){
+                         if(wrong[i][j]==3){
+                             field[i][j]=3;
+                         }
+                     }
+                 }
+                System.out.println("New Starting field: ");
+                QueensPrint(field);
+                 // aktuelle Positionen d Queens merken und sperren, rest reset
+            }
+        }
+        System.out.println("Finale Lösung: ");
+        QueensPrint(field);
+    }
+
+    public static void main(String[] args) {
+         /*for(int i=0; i<4; i++) {
+             System.out.println("i= "+i);
+             System.out.println("Iter : " + Fibonacci_Iter(i));
+             System.out.println("Rec  : " + Fibonacci_Rec(i));
+             System.out.println("Round: " + Fibonacci_Round(i));
+             System.out.println();
+         }*/
+        // ---------------------------------------------------------
+        QueensMain();
         }
     }