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Commit91c7533

Browse files
committed
Modified 2 solutions
1 parent8eaa969 commit91c7533

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2 files changed

+53
-62
lines changed

2 files changed

+53
-62
lines changed

‎Easy/Binary Tree Paths.java

Lines changed: 22 additions & 20 deletions
Original file line numberDiff line numberDiff line change
@@ -8,26 +8,28 @@
88
* }
99
*/
1010
classSolution {
11-
publicList<String>binaryTreePaths(TreeNoderoot) {
12-
List<String>list =newArrayList<>();
13-
if (root !=null) {
14-
getString(root,"",list);
15-
}
16-
17-
returnlist;
11+
List<String>list;
12+
publicList<String>binaryTreePaths(TreeNoderoot) {
13+
list =newArrayList<>();
14+
if (root ==null) {
15+
returnlist;
1816
}
19-
20-
publicvoidgetString(TreeNoderoot,Strings,List<String>list) {
21-
if (root.left ==null &&root.right ==null) {
22-
list.add(s +root.val);
23-
}
24-
25-
if (root.left !=null) {
26-
getString(root.left,s +root.val +"->",list);
27-
}
28-
29-
if (root.right !=null) {
30-
getString(root.right,s +root.val +"->",list);
31-
}
17+
helper(root,newStringBuilder());
18+
returnlist;
19+
}
20+
21+
privatevoidhelper(TreeNoderoot,StringBuildersb) {
22+
if (root ==null) {
23+
return;
3224
}
25+
if (root.left ==null &&root.right ==null) {
26+
sb.append(root.val);
27+
list.add(sb.toString());
28+
}
29+
else {
30+
sb.append(root.val).append("->");
31+
helper(root.left,newStringBuilder(sb.toString()));
32+
helper(root.right,newStringBuilder(sb.toString()));
33+
}
34+
}
3335
}

‎Easy/Cousins in Binary Tree.java

Lines changed: 31 additions & 42 deletions
Original file line numberDiff line numberDiff line change
@@ -8,49 +8,38 @@
88
* }
99
*/
1010
classSolution {
11-
publicbooleanisCousins(TreeNoderoot,intx,inty) {
12-
if (root ==null) {
13-
returnfalse;
14-
}
15-
16-
DetailedNodenodeX =helper(root,null,x,0);
17-
DetailedNodenodeY =helper(root,null,y,0);
18-
19-
if (nodeX ==null ||nodeY ==null) {
20-
returnfalse;
21-
}
22-
23-
returnnodeX.depth ==nodeY.depth &&nodeX.parent !=nodeY.parent;
11+
publicbooleanisCousins(TreeNoderoot,intx,inty) {
12+
if (root ==null ||x ==y) {
13+
returntrue;
2414
}
25-
26-
privateDetailedNodehelper(TreeNoderoot,TreeNodeparent,intnum,intdepth) {
27-
if (root ==null) {
28-
returnnull;
29-
}
30-
31-
if (root.val ==num) {
32-
returnnewDetailedNode(root,parent,depth -1);
33-
}
34-
35-
DetailedNodeleft =helper(root.left,root,num,depth +1);
36-
DetailedNoderight =helper(root.right,root,num,depth +1);
37-
38-
if (left ==null) {
39-
returnright;
40-
}
41-
42-
returnleft;
15+
ParentDatap1 =newParentData();
16+
ParentDatap2 =newParentData();
17+
helper(root,x,0,null,p1);
18+
helper(root,y,0,null,p2);
19+
returnp1.depth ==p2.depth &&p1.parent !=p2.parent;
20+
}
21+
22+
privatevoidhelper(TreeNoderoot,intx,intcurrDepth,TreeNodeparent,ParentDatap) {
23+
if (root ==null) {
24+
return;
4325
}
44-
45-
classDetailedNode {
46-
publicTreeNodenode;
47-
publicTreeNodeparent;
48-
publicintdepth;
49-
50-
publicDetailedNode(TreeNodenode,TreeNodeparent,intdepth) {
51-
this.node =node;
52-
this.parent =parent;
53-
this.depth =depth;
54-
}
26+
if (root.val ==x) {
27+
p.depth =currDepth;
28+
p.parent =parent;
5529
}
30+
else {
31+
helper(root.left,x,currDepth +1,root,p);
32+
helper(root.right,x,currDepth +1,root,p);
33+
}
34+
}
35+
}
36+
37+
classParentData {
38+
intdepth;
39+
TreeNodeparent;
40+
41+
publicParentData() {
42+
this.depth =0;
43+
this.parent =null;
44+
}
5645
}

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