使用DepthFirstSearch算法的java骑士之旅
我正在尝试使用DFS制作程序knight tour,但我无法解决此程序。。因为我总是有这样的信息错误
java线程“AWT-EventQueue-0”中出现异常。lang.ArrayIndexOutofBounds异常:-1 在爪哇。util。ArrayList。elementData(ArrayList.java:371) 在爪哇。util。ArrayList。get(ArrayList.java:384) 在骑士之旅。processKnightTour(KnightTour.java:82)
我希望有人能帮助我
public void processKnightTour(int indexX, int indexY){
System.out.println(indexX);
System.out.println(indexY);
int[] x={2,2,-2,-2,1,1,-1,-1};
int[] y={1,-1,1,-1,2,-2,2,-2};
int countPath=0;
workList = new ArrayList();
node[indexX][indexY] = 1;
workList.add(new Coordinate(indexX, indexY));
current =(Coordinate) workList.get(workList.size()-1);
boolean statusChild;
while(node[current.row][current.column] != 64){
statusChild = false;
for(int loop=0; loop<8; loop++){
if(current.row+x[loop]>=0 && current.row+x[loop]<=7 && current.column+y[loop]>=0 && current.column+y[loop]<=7){
if(node[(current.row+x[loop])][(current.column+y[loop])]==0){
workList.add(new Coordinate(current.row+x[loop], current.column+y[loop], current));
statusChild = true;
}
}
}
if(statusChild == true){
workList.remove(workList.indexOf(current));
}else{
if(workList.size()-2 >= 0){
after = (Coordinate) workList.get(workList.size()-2);
if(current.nodeParent.equals(after.nodeParent)){
}else{
node[current.nodeParent.row][current.nodeParent.column] = 0;
}
}
node[current.row][current.column] = 0;
workList.remove(workList.size()-1);
}
current = (Coordinate) workList.get(workList.size()-1);
node[current.row][current.column] = (node[current.getParent().row][current.getParent().column])+1;
countPath++;
//System.out.println(countPath+", "+workList.size()+", "+node[current.column][current.row]);
}
}
# 1 楼答案
在这段代码的末尾,您将:
get(worklist.size()-1)
,该列表可以(并且将)大小为0李>你的while循环中有一些不太正确的地方。我没有清楚地看到意图,但您应该以某种方式确保
workList
使用正确