최대 두 개의 자식이 있는 이진 트리로 왼쪽 자식과 오른쪽 자식으로 지정됩니다. 이것은 이진 트리에서 가장 깊은 왼쪽 리프를 찾는 C++ 프로그램입니다.
알고리즘
Begin. function deepestLLeafutil() find the deepest left leaf in a given binary tree: lvel is level of current node. maxlvel is pointer to the deepest left leaf node found so far isLeft Indicates that this node is left child of its parent resPtr is Pointer to the result If root is equal to Null then Return. Update result if this node is having a left leaf and its level is more than the max level of the current result. Recursively call function deepestLLeafutil() for left and right subtrees. End.
예시 코드
#include <iostream> using namespace std; struct n { int v; n *l, *r; }; void deepestLLeafutil(n *root, int lvel, int *maxvel, bool isLeft, n **resPtr) { if (root == NULL) return; if (isLeft && !root->l && !root->r && lvel > *maxvel) { *resPtr = root; *maxvel = lvel; return; } deepestLLeafutil(root->l, lvel + 1, maxvel, true, resPtr); deepestLLeafutil(root->r, lvel + 1, maxvel, false, resPtr); } n* deepestLLeaf( n *root) { int maxlevel = 0; n *res = NULL; deepestLLeafutil(root, 0, &maxlevel, false, &res); return res; } n *newnode(int d) { n *t = new n; t->v = d; t->l = t->r = NULL; return t; } int main() { n* root = newnode(9); root->l = newnode(7); root->r = newnode(10); root->l->l = newnode(6); root->r->l= newnode(8); root->r->r = newnode(19); root->r->l->r = newnode(4); root->r->r->r = newnode(20); n *res = deepestLLeaf(root); if (res) cout << "The deepest left leaf is " << res->v; else cout << "There is no left leaf in the given tree"; return 0; }
출력
The deepest left leaf is 6