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Update the book based on the revised second edition (#1014)
* Revised the book * Update the book with the second revised edition * Revise base on the manuscript of the first edition
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@@ -24,7 +24,7 @@ pub fn main() {
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print_util::print_hash_map(&map);
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// 查询操作
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// 向哈希表输入键 key ,得到值 value
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// 向哈希表中输入键 key ,得到值 value
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let name = map.get(&15937).copied().unwrap();
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println!("\n输入学号 15937 ,查询到姓名 {name}");
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