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POJavaScript to Java Conversion
 

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    <p>I have this function in JavaScript:</p> <pre><code>// this is a unit-cost specialization of dijkstra's algorithm function floodfill(distmap,idx) { var q = [idx], q2 = []; distmap[idx] = 1; var dist = 1; while(q.length) { dist++; for(var i=0;i&lt;q.length;i++) { var idx = q[i]; for(var move=0;move&lt;4;move++) { var i2 = idx+di[move]; if(map[i2] || distmap[i2]) continue; distmap[i2] = dist; q2.push(i2); } } q = q2; q2 = []; } return distmap; } </code></pre> <p>and it's called </p> <pre><code>var p1dist; p1dist = floodfill([], myi); // myi its position of player 2 in map (for example 13 // and map[13] = 2); </code></pre> <p>map it's this :</p> <pre><code>// map: 0 = empty, -1 = wall, 1 = player 1, 2 = player 2 var map = []; var w = 7 //width of map var h = 9 //height of map // start out with a clear map with a border around the edges for(var j=0;j&lt;h*w;j++) map[j] = 0; function addWall(x,y) { map[x+y*w] = -1; } for(var i=0;i&lt;w;i++) { addWall(i,0); addWall(i,h-1); } for(j=0;j&lt;h;j++) { addWall(0,j); addWall(w-1,j); } </code></pre> <p>I tried to rewrite this function (floodfill) for Java but with no succes. Where I think wrong? </p> <pre><code>public int[] floodfill(int idx) { int[] q, q2, distmap; q2 = new int[1]; q = new int[idx]; distmap = new int [w*h]; distmap[idx] = 1; int dist = 1; while(q.length != 0) { dist++; for(int i=0; i &lt; q.length; i++) { int index = q[i]; for(int move = 0; move &lt; 4; move++) { int i2 = index+di[move]; if (i2 &gt; 0) { if(map[i2] == 0 || distmap[i2] == 0) continue; distmap[i2] = dist; q2 = push(i2, q2); } } } q = q2; q2 = new int[1]; } return distmap; } int[] p1dist; p1dist = floodfill(myi); </code></pre> <p>And function push:</p> <pre><code>public int[] push(int k, int[] r) { int[] p; p = new int[r.length+1]; p[r.length] = k; r = p; return r; } </code></pre> <p>Please, if someone doesn't understand my question or something else ask for more details but i really need an answer because I have deadline tonight.</p> <p>For this function and a map like this (5 means wall and map it's int[] not int[][]):</p> <pre><code> 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 0 0 0 0 0 5 0 0 0 5 5 0 0 2 0 0 0 0 0 0 5 5 5 5 0 0 0 0 0 0 0 0 0 0 1 5 5 5 5 5 5 5 5 5 5 5 5 5 5 public int[] floodfill(int idx) { ArrayList&lt;Integer&gt; q, q2; int[] distmap; q2 = new ArrayList&lt;Integer&gt;(); q = new ArrayList&lt;Integer&gt;(); q.add(idx); distmap = new int [w*h]; distmap[idx] = 1; int dist = 1; while(q.isEmpty()) { dist++; for(Integer index:q) { for(int move = 0; move &lt; 4; move++) { int i2 = index+di[move]; if (i2 &gt; 0) { if( i2 &gt; map.length || i2 &gt; distmap.length) continue; distmap[i2] = dist; q2.add(i2); } } } q = q2; q2 = new ArrayList&lt;Integer&gt;(); } return distmap; } </code></pre> <p>I have this horrible output:</p> <pre><code> [I@24753433 [I@24753433 [I@24753433 ... [I@24753433 [I@24753433 [I@24753433 </code></pre>
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    2. COUse `ArrayList<T>`.
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    3. COin javaScript function, idx its a parameter and then its redefine var idx = q[i]; I dont understand if the idx from here int i2 = index+di[move]; its the same with parameter or with var idx = q[i];. Also, if(map[i2] || distmap[i2]) means map[i2] != 0 or distmap[i2] != 0 ?? And if it dont exist? cuz in java will check map[73] for example and map[] its defined like map[65]..and error java.lang.ArrayIndexOutOfBoundsException: 73
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