leetcode-problemset/leetcode/originData/[no content]implement-trie-ii-prefix-tree.json

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        "question": {
            "questionId": "1949",
            "questionFrontendId": "1804",
            "boundTopicId": null,
            "title": "Implement Trie II (Prefix Tree)",
            "titleSlug": "implement-trie-ii-prefix-tree",
            "content": null,
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            "difficulty": "Medium",
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            "exampleTestcases": "[\"Trie\",\"insert\",\"insert\",\"countWordsEqualTo\",\"countWordsStartingWith\",\"erase\",\"countWordsEqualTo\",\"countWordsStartingWith\",\"erase\",\"countWordsStartingWith\"]\n[[],[\"apple\"],[\"apple\"],[\"apple\"],[\"app\"],[\"apple\"],[\"apple\"],[\"app\"],[\"apple\"],[\"app\"]]",
            "categoryTitle": "Algorithms",
            "contributors": [],
            "topicTags": [
                {
                    "name": "Hash Table",
                    "slug": "hash-table",
                    "translatedName": null,
                    "__typename": "TopicTagNode"
                },
                {
                    "name": "String",
                    "slug": "string",
                    "translatedName": null,
                    "__typename": "TopicTagNode"
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                {
                    "name": "Design",
                    "slug": "design",
                    "translatedName": null,
                    "__typename": "TopicTagNode"
                },
                {
                    "name": "Trie",
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                    "translatedName": null,
                    "__typename": "TopicTagNode"
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            "hints": [
                "Try to solve the first version first and reuse your code.",
                "To implement the delete function, you should delete the trie nodes of the word if they are not shared with other words.",
                "You should keep for each trie node a counter of how many words share this node."
            ],
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            "sampleTestCase": "[\"Trie\",\"insert\",\"insert\",\"countWordsEqualTo\",\"countWordsStartingWith\",\"erase\",\"countWordsEqualTo\",\"countWordsStartingWith\",\"erase\",\"countWordsStartingWith\"]\n[[],[\"apple\"],[\"apple\"],[\"apple\"],[\"app\"],[\"apple\"],[\"apple\"],[\"app\"],[\"apple\"],[\"app\"]]",
            "metaData": "{\n  \"classname\": \"Trie\",\n  \"constructor\": {\n    \"params\": []\n  },\n  \"methods\": [\n    {\n      \"params\": [\n        {\n          \"type\": \"string\",\n          \"name\": \"word\"\n        }\n      ],\n      \"name\": \"insert\",\n      \"return\": {\n        \"type\": \"void\"\n      }\n    },\n    {\n      \"params\": [\n        {\n          \"type\": \"string\",\n          \"name\": \"word\"\n        }\n      ],\n      \"name\": \"countWordsEqualTo\",\n      \"return\": {\n        \"type\": \"integer\"\n      }\n    },\n    {\n      \"params\": [\n        {\n          \"type\": \"string\",\n          \"name\": \"prefix\"\n        }\n      ],\n      \"name\": \"countWordsStartingWith\",\n      \"return\": {\n        \"type\": \"integer\"\n      }\n    },\n    {\n      \"params\": [\n        {\n          \"type\": \"string\",\n          \"name\": \"word\"\n        }\n      ],\n      \"name\": \"erase\",\n      \"return\": {\n        \"type\": \"void\"\n      }\n    }\n  ],\n  \"return\": {\n    \"type\": \"boolean\"\n  },\n  \"systemdesign\": true\n}",
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Adding an item to a hash.</b>\\r\\n<pre>\\r\\nstruct hash_entry {\\r\\n    int id;            /* we'll use this field as the key */\\r\\n    char name[10];\\r\\n    UT_hash_handle hh; /* makes this structure hashable */\\r\\n};\\r\\n\\r\\nstruct hash_entry *users = NULL;\\r\\n\\r\\nvoid add_user(struct hash_entry *s) {\\r\\n    HASH_ADD_INT(users, id, s);\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>2. Looking up an item in a hash:</b>\\r\\n<pre>\\r\\nstruct hash_entry *find_user(int user_id) {\\r\\n    struct hash_entry *s;\\r\\n    HASH_FIND_INT(users, &user_id, s);\\r\\n    return s;\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>3. 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