leetcode

Daily Problem

2 files changed, 36 insertions(+), 1 deletions(-)

diff --git a/ Problems/0652.cpp b/ Problems/0652.cpp

@@ -0,0 +1,34 @@

class Solution {

public:

vector<TreeNode *> findDuplicateSubtrees(TreeNode *root) {

if (!root) return {};

unordered_map<string, vector<TreeNode *>> seen;

unordered_map<TreeNode *, string> um;

vector<TreeNode *> res;

stack<TreeNode *> st;

st.push(root);

um[nullptr] = "#";

while (!st.empty()) {

auto root = st.top();

if (um.count(root)) {

um[root] =

to_string(root->val) + ' ' + um[root->left] + ' ' + um[root->right];

seen[um[root]].push_back(root);

st.pop();

continue;

}

um[root] = "";

if (root->right) st.push(root->right);

if (root->left) st.push(root->left);

}

for (const auto &[k, v] : seen)

if (v.size() > 1) res.push_back(v.back());

return res;

}

};

diff --git a/ README.md b/ README.md

@@ -231,6 +231,7 @@ for solving problems. | 0416 | Medium | [Partition Equal Subset Sum](Problems/0416.cpp) | | 0417 | Medium | [Pacific Atlantic Water Flow](Problems/0417.cpp) | | 0424 | Medium | [Longest Repeating Character Replacement](Problems/0424.cpp) |

| 0427 | Medium | [Construct Quad Tree](Problems/0427.cpp) |

| 0429 | Medium | [N-ary Tree Level Order Traversal](Problems/0429.cpp) | | 0430 | Medium | [Flatten a Multilevel Doubly Linked list](Problems/0430.cpp) | | 0433 | Medium | [Minimum Genetic Mutation](Problems/0433.cpp) |

@@ -278,6 +279,7 @@ for solving problems. | 0617 | Easy | [Merge Two Binary Trees](Problems/0617.cpp) | | 0621 | Medium | [Task Scheduler](Problems/0621.cpp) | | 0637 | Easy | [Average of Levels in Binary Tree](Problems/0637.cpp) |

| 0652 | Medium | [Find Duplicate Subtrees](Problems/0652.cpp) |

| 0653 | Easy | [Two Sum IV - Input is a BST](Problems/0653.cpp) | | 0654 | Medium | [Maximum Binary Tree](Problems/0654.cpp) | | 0662 | Medium | [Maximum Width of Binary Tree](Problems/0662.cpp) |

@@ -464,5 +466,4 @@ for solving problems. | 2477 | Medium | [Minimum Fuel Cost to Report to the Capital](Problems/2477.cpp) | | 2492 | Medium | [Minimum Score of a Path Between Two Cities](Problems/2492.cpp) | | 2497 | Medium | [Maximum Star Sum of a Graph](Problems/2497.cpp) |

| 0427 | Medium | [Construct Quad Tree](Problems/0427.cpp) |