{ "data": { "question": { "questionId": "1728", "questionFrontendId": "1622", "categoryTitle": "Algorithms", "boundTopicId": 448364, "title": "Fancy Sequence", "titleSlug": "fancy-sequence", "content": "
Write an API that generates fancy sequences using the append
, addAll
, and multAll
operations.
Implement the Fancy
class:
Fancy()
Initializes the object with an empty sequence.void append(val)
Appends an integer val
to the end of the sequence.void addAll(inc)
Increments all existing values in the sequence by an integer inc
.void multAll(m)
Multiplies all existing values in the sequence by an integer m
.int getIndex(idx)
Gets the current value at index idx
(0-indexed) of the sequence modulo 109 + 7
. If the index is greater or equal than the length of the sequence, return -1
.\n
Example 1:
\n\n\nInput\n["Fancy", "append", "addAll", "append", "multAll", "getIndex", "addAll", "append", "multAll", "getIndex", "getIndex", "getIndex"]\n[[], [2], [3], [7], [2], [0], [3], [10], [2], [0], [1], [2]]\nOutput\n[null, null, null, null, null, 10, null, null, null, 26, 34, 20]\n\nExplanation\nFancy fancy = new Fancy();\nfancy.append(2); // fancy sequence: [2]\nfancy.addAll(3); // fancy sequence: [2+3] -> [5]\nfancy.append(7); // fancy sequence: [5, 7]\nfancy.multAll(2); // fancy sequence: [5*2, 7*2] -> [10, 14]\nfancy.getIndex(0); // return 10\nfancy.addAll(3); // fancy sequence: [10+3, 14+3] -> [13, 17]\nfancy.append(10); // fancy sequence: [13, 17, 10]\nfancy.multAll(2); // fancy sequence: [13*2, 17*2, 10*2] -> [26, 34, 20]\nfancy.getIndex(0); // return 26\nfancy.getIndex(1); // return 34\nfancy.getIndex(2); // return 20\n\n\n
\n
Constraints:
\n\n1 <= val, inc, m <= 100
0 <= idx <= 105
105
calls total will be made to append
, addAll
, multAll
, and getIndex
.请你实现三个 API append
,addAll
和 multAll
来实现奇妙序列。
请实现 Fancy
类 :
Fancy()
初始化一个空序列对象。void append(val)
将整数 val
添加在序列末尾。void addAll(inc)
将所有序列中的现有数值都增加 inc
。void multAll(m)
将序列中的所有现有数值都乘以整数 m
。int getIndex(idx)
得到下标为 idx
处的数值(下标从 0 开始),并将结果对 109 + 7
取余。如果下标大于等于序列的长度,请返回 -1
。\n\n
示例:
\n\n\n输入:\n[\"Fancy\", \"append\", \"addAll\", \"append\", \"multAll\", \"getIndex\", \"addAll\", \"append\", \"multAll\", \"getIndex\", \"getIndex\", \"getIndex\"]\n[[], [2], [3], [7], [2], [0], [3], [10], [2], [0], [1], [2]]\n输出:\n[null, null, null, null, null, 10, null, null, null, 26, 34, 20]\n\n解释:\nFancy fancy = new Fancy();\nfancy.append(2); // 奇妙序列:[2]\nfancy.addAll(3); // 奇妙序列:[2+3] -> [5]\nfancy.append(7); // 奇妙序列:[5, 7]\nfancy.multAll(2); // 奇妙序列:[5*2, 7*2] -> [10, 14]\nfancy.getIndex(0); // 返回 10\nfancy.addAll(3); // 奇妙序列:[10+3, 14+3] -> [13, 17]\nfancy.append(10); // 奇妙序列:[13, 17, 10]\nfancy.multAll(2); // 奇妙序列:[13*2, 17*2, 10*2] -> [26, 34, 20]\nfancy.getIndex(0); // 返回 26\nfancy.getIndex(1); // 返回 34\nfancy.getIndex(2); // 返回 20\n\n\n
\n\n
提示:
\n\n1 <= val, inc, m <= 100
0 <= idx <= 105
105
次对 append
,addAll
,multAll
和 getIndex
的调用。\\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\"],\"java\":[\"Java\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u88ab\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5305\\u542b Pair \\u7c7b: https:\\/\\/docs.oracle.com\\/javase\\/8\\/javafx\\/api\\/javafx\\/util\\/Pair.html <\\/p>\"],\"python\":[\"Python\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u5e38\\u7528\\u5e93\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8 \\u5bfc\\u5165\\uff0c\\u5982\\uff1aarray<\\/a>, bisect<\\/a>, 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out-of-bounds<\\/code>\\u548c
use-after-free<\\/code>\\u9519\\u8bef\\u3002<\\/p>\\r\\n\\r\\n
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Python 2.7.12<\\/code><\\/p>\\r\\n\\r\\n
GCC 8.2<\\/code>\\uff0c\\u91c7\\u7528GNU11\\u6807\\u51c6\\u3002<\\/p>\\r\\n\\r\\n
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out-of-bounds<\\/code>\\u548c
use-after-free<\\/code>\\u9519\\u8bef\\u3002<\\/p>\\r\\n\\r\\n
\\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
\\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
\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n HASH_DEL(users, user); \\r\\n}\\r\\n<\\/pre>\\r\\n<\\/p>\"],\"csharp\":[\"C#\",\"
Node.js 16.13.2<\\/code><\\/p>\\r\\n\\r\\n
--harmony<\\/code> \\u6807\\u8bb0\\u6765\\u5f00\\u542f \\u65b0\\u7248ES6\\u7279\\u6027<\\/a>\\u3002<\\/p>\\r\\n\\r\\n
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Python 3.10<\\/code><\\/p>\\r\\n\\r\\n
Scala 2.13<\\/code><\\/p>\"],\"kotlin\":[\"Kotlin\",\"
Kotlin 1.9.0<\\/code><\\/p>\\r\\n\\r\\n
rust 1.58.1<\\/code><\\/p>\\r\\n\\r\\n
PHP 8.1<\\/code>.<\\/p>\\r\\n\\r\\n