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PathSumIII.java
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40 lines (36 loc) · 886 Bytes
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package t437;
public class PathSumIII {
public class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode() {}
TreeNode(int val) { this.val = val; }
TreeNode(int val, TreeNode left, TreeNode right) {
this.val = val;
this.left = left;
this.right = right;
}
}
int path(TreeNode root,int que){
if(root==null){
return 0;
}
int res = 0;
if(root.val==que){
res++;
}
res+=path(root.left,que-root.val);
res+=path(root.right,que-root.val);
return res;
}
public int pathSum(TreeNode root, int sum) {
int res = 0;
if(root==null)
return res;
res+=pathSum(root.left,sum);
res+=path(root,sum);
res+=pathSum(root.right,sum);
return res;
}
}