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Added 609. Find Duplicate File in System #393

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4791b20
Add 609. Find Duplicate File in System
MAnonInfinity Oct 21, 2022
e4f76f4
Added 606. Construct String from Binary Tree
MAnonInfinity Oct 21, 2022
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26 changes: 26 additions & 0 deletions LeetCode/606. Construct String from Binary Tree
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Original file line number Diff line number Diff line change
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class Solution {
public:
string str = "";

void dfs(TreeNode* node, TreeNode* root) {
if (node == NULL)
return;

if (node != root)
str += '(';
str += to_string(node->val);
dfs(node->left, root);
if (node->left==NULL && node->right!=NULL)
str += "()";

dfs(node->right, root);
if (node != root)
str += ')';
}

string tree2str(TreeNode* root) {
dfs(root, root);

return str;
}
};
40 changes: 40 additions & 0 deletions LeetCode/609. Find Duplicate File in System
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Original file line number Diff line number Diff line change
@@ -0,0 +1,40 @@
class Solution {
public:
vector<vector<string>> findDuplicate(vector<string>& paths) {
vector<vector<string>> ans;
unordered_map<string, vector<string>> m;

for (auto i: paths) {
string chunk = "", path = "";
stringstream ss(i);

while(ss >> chunk) {
// cout<<chunk<<endl;

if (path == "") { // this will run, if the chunk is a path
path = chunk;
continue;
}

// this will run, if the chunk is a file
string reversedContent = "";
for (int j=chunk.length()-1; chunk[--j] != '(';)
reversedContent += chunk[j];
// cout<<"reversed content = "<<reversedContent<<endl;

string fileName = "";
for (int j=0; chunk[j] != '('; j++)
fileName += chunk[j];
// cout<<"fileName = "<<fileName<<endl;

m[reversedContent].push_back(path + '/' + fileName);
}
}

for (auto &[revContent, pathAndFile]: m)
if (pathAndFile.size() > 1)
ans.push_back(pathAndFile);

return ans;
}
};