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Lowest common ancestor
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#include <iostream> #include <list> #include <vector> using namespace std; struct BinTree { int data; BinTree *left; BinTree *right; BinTree(int d, BinTree* l, BinTree* r): data(d), left(l), right(r) {} }; BinTree* LowestCommonAncestor(BinTree* root, int a, int b) { if (!root) return NULL; if (a == root->data || b == root->data) return root; BinTree* lhcLeft = LowestCommonAncestor(root->left, a, b); BinTree* lhcRight = LowestCommonAncestor(root->right, a, b); if (lhcLeft && lhcRight) return root; if (lhcLeft) return lhcLeft; if (lhcRight) return lhcRight; return NULL; } // 4 // / \ // 2 8 // / \ / \ // 1 3 6 9 // / \ // 5 7 int main() { BinTree *h = new BinTree(7, NULL, NULL); BinTree *j = new BinTree(5, NULL, NULL); BinTree *g = new BinTree(9, NULL, NULL); BinTree *f = new BinTree(6, j, h); BinTree *e = new BinTree(3, NULL, NULL); BinTree *d = new BinTree(1, NULL, NULL); BinTree *c = new BinTree(8, f, g); BinTree *b = new BinTree(2, d, e); BinTree *a = new BinTree(4, b, c); cout << LowestCommonAncestor(a, 1, 3)->data; }
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Compilation time: 0.35 sec, absolute running time: 0.04 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0.4 sec
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