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關(guān)于用C語(yǔ)言實(shí)現搜索引(°ロ°) !擎的語(yǔ)言編語(yǔ)核心代碼,綜合多個(gè)權威資源,程??搜主??要包含以下幾個(gè)關(guān)鍵部分:
一、索引倒排索引(Inverted Index)
倒排索引是代碼搜索引擎的核心數據結構,用于存儲關(guān)鍵詞與文檔的語(yǔ)言編語(yǔ)映射關(guān)系。以下是程搜一個(gè)簡(jiǎn)單的倒排索引實(shí)現示例:
```c
include include include define MAX_WORDS 10000 define MAX DocNum 1000 define MAX_WORD_LEN 100 typedef struct { char *word; int doc_id; } InvertedEntry; typedef struct { InvertedEntry *en??t(╥_╥)ri(???)es; int size; int capacity; } Index; void init_index(Index *idx, int capacity) { idx->entries = (InvertedEntry *)malloc(sizeof(InvertedEntry) * capacity); idx->size = 0; idx->capacity = capacity; } void add_documen( ?° ?? ?°)t(Index *idx, const char *doc_id, const char *c(°□°)ontent) { ch(?????)ar *token = strtok(content, " "); while (token != NU(╯°□°)╯︵ ┻━┻LL) { int found = 0; for (int i = 0; i < idx->size; i++) { if (strcmp(idx->entries[i].word, token) == 0) { idx->entries[i].doc_id = doc_id; found = 1; break; } } if (!found) { if (idx->size == idx->ca??pacity) { idx->capac??ity *= 2; idx->entries = (InvertedEntry *)realloc(idx->entri??es, sizeof(InvertedEntry) * idx->ヽ(′▽?zhuān)?ノcapacity); } strcpy(idヽ(′▽?zhuān)?ノx->entries[idx->size].word,?? token); idx(′?_?`)->entries[idx->size].doc_id = doc_id; idx->size++; } token = strtok(NULL, " "); } } void search(Index *idx, const ch??ar?? *query) { char *token = strtok(query, " "); while (token != NULL) { int found = 0; for (int i = 0; i < idx->size; i++) { if (strc(′▽?zhuān)?)mp(idx->e??ntries[i].word, token) == 0) { printf("Document ID: %d\n", idx->entries[i].doc_id); found = 1; } } if (!found) { printf("Word '%s' not found\n", token); } toke??n = strtok(NULL, " ")??; } } int main() { Index idx; add_d??ocument(&idxヾ(′▽?zhuān)??, 1, "C語(yǔ)言搜索引擎示例"); add_document(&idx, 2, "倒排索引實(shí)現"); add_document(&idx, 1, "線(xiàn)性搜索與二分搜索"); search(&id??x, "C語(yǔ)言"); search(&idx, "倒排索引"); free(idx.entries); return 0; } ``` 二、搜索算法(如二分搜索) ```c include int binary_search(int arr[],索引 int size, int target, int?? (*cmp)(void*, void*)) { int le??ft = 0, right = size - 1; while (left <= right) { int?? mid = left + (right - left) / 2; if (cmp(&arr[mid], &targ┐(′д`)┌et) == 0) { return mid; } else if (cmp(&arr[mid], &target) < 0) { left = mid + 1; } else { right = mid - 1; } } return -1; } int compare(const void *a, const void *b) { return (*(int *)a - *(int *)b); } int main() { int arr[] = { 1, 3, 5, 7, 9, 11};(′?`*) int size = sizeof(arr) / sizeof(arr); int target = 7; int result = binary_search(arr, size, target, co???mpare); if (result != -1) { printf("Element found at index %d\n", reヾ(′ω`)?sult); } else { printf("Element not found\n"); } return 0; } ``` 三、網(wǎng)絡(luò )爬蟲(chóng)基礎
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