feat: add solution to lc problem: No.3485 (#4340)

Author: Parth-Dholariya

solution/3400-3499/3485.Longest Common Prefix of K Strings After Removal/README.md

@@ -114,13 +114,248 @@ tags:
 #### Java
 
 ```java
-
+class Solution {
+    static class TrieNode {
+        int count = 0;
+        int depth = 0;
+        int[] children = new int[26];
+
+        TrieNode() {
+            for (int i = 0; i < 26; ++i) children[i] = -1;
+        }
+    }
+
+    static class SegmentTree {
+        int n;
+        int[] tree;
+        int[] globalCount;
+
+        SegmentTree(int n, int[] globalCount) {
+            this.n = n;
+            this.globalCount = globalCount;
+            this.tree = new int[4 * (n + 1)];
+            for (int i = 0; i < tree.length; i++) tree[i] = -1;
+            build(1, 1, n);
+        }
+
+        void build(int idx, int l, int r) {
+            if (l == r) {
+                tree[idx] = globalCount[l] > 0 ? l : -1;
+                return;
+            }
+            int mid = (l + r) / 2;
+            build(idx * 2, l, mid);
+            build(idx * 2 + 1, mid + 1, r);
+            tree[idx] = Math.max(tree[idx * 2], tree[idx * 2 + 1]);
+        }
+
+        void update(int idx, int l, int r, int pos, int newVal) {
+            if (l == r) {
+                tree[idx] = newVal > 0 ? l : -1;
+                return;
+            }
+            int mid = (l + r) / 2;
+            if (pos <= mid) {
+                update(idx * 2, l, mid, pos, newVal);
+            } else {
+                update(idx * 2 + 1, mid + 1, r, pos, newVal);
+            }
+            tree[idx] = Math.max(tree[idx * 2], tree[idx * 2 + 1]);
+        }
+
+        int query() {
+            return tree[1];
+        }
+    }
+
+    public int[] longestCommonPrefix(String[] words, int k) {
+        int n = words.length;
+        int[] ans = new int[n];
+        if (n - 1 < k) return ans;
+
+        ArrayList<TrieNode> trie = new ArrayList<>();
+        trie.add(new TrieNode());
+
+        for (String word : words) {
+            int cur = 0;
+            for (char c : word.toCharArray()) {
+                int idx = c - 'a';
+                if (trie.get(cur).children[idx] == -1) {
+                    trie.get(cur).children[idx] = trie.size();
+                    TrieNode node = new TrieNode();
+                    node.depth = trie.get(cur).depth + 1;
+                    trie.add(node);
+                }
+                cur = trie.get(cur).children[idx];
+                trie.get(cur).count++;
+            }
+        }
+
+        int maxDepth = 0;
+        for (int i = 1; i < trie.size(); ++i) {
+            if (trie.get(i).count >= k) {
+                maxDepth = Math.max(maxDepth, trie.get(i).depth);
+            }
+        }
+
+        int[] globalCount = new int[maxDepth + 1];
+        for (int i = 1; i < trie.size(); ++i) {
+            TrieNode node = trie.get(i);
+            if (node.count >= k && node.depth <= maxDepth) {
+                globalCount[node.depth]++;
+            }
+        }
+
+        List<List<Integer>> fragileList = new ArrayList<>();
+        for (int i = 0; i < n; ++i) {
+            fragileList.add(new ArrayList<>());
+        }
+
+        for (int i = 0; i < n; ++i) {
+            int cur = 0;
+            for (char c : words[i].toCharArray()) {
+                int idx = c - 'a';
+                cur = trie.get(cur).children[idx];
+                if (trie.get(cur).count == k) {
+                    fragileList.get(i).add(trie.get(cur).depth);
+                }
+            }
+        }
+
+        int segSize = maxDepth;
+        if (segSize >= 1) {
+            SegmentTree segTree = new SegmentTree(segSize, globalCount);
+            for (int i = 0; i < n; ++i) {
+                if (n - 1 < k) {
+                    ans[i] = 0;
+                } else {
+                    for (int d : fragileList.get(i)) {
+                        segTree.update(1, 1, segSize, d, globalCount[d] - 1);
+                    }
+                    int res = segTree.query();
+                    ans[i] = res == -1 ? 0 : res;
+                    for (int d : fragileList.get(i)) {
+                        segTree.update(1, 1, segSize, d, globalCount[d]);
+                    }
+                }
+            }
+        }
+
+        return ans;
+    }
+}
 ```
 
 #### C++
 
 ```cpp
-
+class Solution {
+public:
+    struct TrieNode {
+        int count = 0;
+        int depth = 0;
+        int children[26] = {0};
+    };
+
+    class SegmentTree {
+    public:
+        int n;
+        vector<int> tree;
+        vector<int>& globalCount;
+        SegmentTree(int n, vector<int>& globalCount)
+            : n(n)
+            , globalCount(globalCount) {
+            tree.assign(4 * (n + 1), -1);
+            build(1, 1, n);
+        }
+        void build(int idx, int l, int r) {
+            if (l == r) {
+                tree[idx] = globalCount[l] > 0 ? l : -1;
+                return;
+            }
+            int mid = (l + r) / 2;
+            build(idx * 2, l, mid);
+            build(idx * 2 + 1, mid + 1, r);
+            tree[idx] = max(tree[idx * 2], tree[idx * 2 + 1]);
+        }
+        void update(int idx, int l, int r, int pos, int newVal) {
+            if (l == r) {
+                tree[idx] = newVal > 0 ? l : -1;
+                return;
+            }
+            int mid = (l + r) / 2;
+            if (pos <= mid)
+                update(idx * 2, l, mid, pos, newVal);
+            else
+                update(idx * 2 + 1, mid + 1, r, pos, newVal);
+            tree[idx] = max(tree[idx * 2], tree[idx * 2 + 1]);
+        }
+        int query() {
+            return tree[1];
+        }
+    };
+
+    vector<int> longestCommonPrefix(vector<string>& words, int k) {
+        int n = words.size();
+        vector<int> ans(n, 0);
+        if (n - 1 < k) return ans;
+        vector<TrieNode> trie(1);
+        for (const string& word : words) {
+            int cur = 0;
+            for (char c : word) {
+                int idx = c - 'a';
+                if (trie[cur].children[idx] == 0) {
+                    trie[cur].children[idx] = trie.size();
+                    trie.push_back({0, trie[cur].depth + 1});
+                }
+                cur = trie[cur].children[idx];
+                trie[cur].count++;
+            }
+        }
+        int maxDepth = 0;
+        for (int i = 1; i < trie.size(); ++i) {
+            if (trie[i].count >= k) {
+                maxDepth = max(maxDepth, trie[i].depth);
+            }
+        }
+        vector<int> globalCount(maxDepth + 1, 0);
+        for (int i = 1; i < trie.size(); ++i) {
+            if (trie[i].count >= k && trie[i].depth <= maxDepth) {
+                globalCount[trie[i].depth]++;
+            }
+        }
+        vector<vector<int>> fragileList(n);
+        for (int i = 0; i < n; ++i) {
+            int cur = 0;
+            for (char c : words[i]) {
+                int idx = c - 'a';
+                cur = trie[cur].children[idx];
+                if (trie[cur].count == k) {
+                    fragileList[i].push_back(trie[cur].depth);
+                }
+            }
+        }
+        int segSize = maxDepth;
+        if (segSize >= 1) {
+            SegmentTree segTree(segSize, globalCount);
+            for (int i = 0; i < n; ++i) {
+                if (n - 1 < k) {
+                    ans[i] = 0;
+                } else {
+                    for (int d : fragileList[i]) {
+                        segTree.update(1, 1, segSize, d, globalCount[d] - 1);
+                    }
+                    int res = segTree.query();
+                    ans[i] = res == -1 ? 0 : res;
+                    for (int d : fragileList[i]) {
+                        segTree.update(1, 1, segSize, d, globalCount[d]);
+                    }
+                }
+            }
+        }
+        return ans;
+    }
+};
 ```
 
 #### Go