int lowestCommonAncestor(struct TreeNode* root, int p, int q ) {
// write code here
int low = 0, high = 0;
if (p > q) {
low = q;
high = p;
} else {
low = p;
high = q;
}
if (low <= root->val && high >= root->val) {
return root->val;
} else if (high < root->val) {
return lowestCommonAncestor(root->left, p, q);
} else {
return lowestCommonAncestor(root->right, p, q);
}
}



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