有 n
个 (id, value)
对,其中 id
是 1
到 n
之间的一个整数,value
是一个字符串。不存在 id
相同的两个 (id, value)
对。
设计一个流,以 任意 顺序获取 n
个 (id, value)
对,并在多次调用时 按 id
递增的顺序 返回一些值。
实现 OrderedStream
类:
OrderedStream(int n)
构造一个能接收 n
个值的流,并将当前指针 ptr
设为 1
。String[] insert(int id, String value)
向流中存储新的 (id, value)
对。存储后:
id = ptr 的 (id, value)
对,则找出从 id = ptr
开始的 最长 id 连续递增序列 ,并 按顺序 返回与这些 id 关联的值的列表。然后,将 ptr
更新为最后那个 id + 1
。输入
["OrderedStream", "insert", "insert", "insert", "insert", "insert"]
[[5], [3, "ccccc"], [1, "aaaaa"], [2, "bbbbb"], [5, "eeeee"], [4, "ddddd"]]
输出
[null, [], ["aaaaa"], ["bbbbb", "ccccc"], [], ["ddddd", "eeeee"]]
解释
OrderedStream os= new OrderedStream(5);
os.insert(3, "ccccc"); // 插入 (3, "ccccc"),返回 []
os.insert(1, "aaaaa"); // 插入 (1, "aaaaa"),返回 ["aaaaa"]
os.insert(2, "bbbbb"); // 插入 (2, "bbbbb"),返回 ["bbbbb", "ccccc"]
os.insert(5, "eeeee"); // 插入 (5, "eeeee"),返回 []
os.insert(4, "ddddd"); // 插入 (4, "ddddd"),返回 ["ddddd", "eeeee"]
https://leetcode.cn/problems/design-an-ordered-stream/
struct OrderedStream {
values: Vec<String>,
ptr: usize,
}
/**
* `&self` means the method takes an immutable reference.
* If you need a mutable reference, change it to `&mut self` instead.
*/
impl OrderedStream {
fn new(n: i32) -> Self {
OrderedStream {
values: vec!["".to_string(); n as usize],
ptr: 0,
}
}
fn insert(&mut self, id_key: i32, value: String) -> Vec<String> {
self.values[(id_key - 1) as usize] = value;
let mut res = Vec::new();
while self.ptr < self.values.len() && self.values[self.ptr] != "" {
res.push(self.values[self.ptr].clone());
self.ptr += 1;
}
res
}
}
/**
* Your OrderedStream object will be instantiated and called as such:
* let obj = OrderedStream::new(n);
* let ret_1: Vec = obj.insert(idKey, value);
*/
type OrderedStream struct {
values []string
ptr int
}
func Constructor(n int) OrderedStream {
return OrderedStream{
values: make([]string, n),
ptr: 0,
}
}
func (this *OrderedStream) Insert(idKey int, value string) []string {
this.values[idKey-1] = value
start := this.ptr
for this.ptr < len(this.values) && this.values[this.ptr] != "" {
this.ptr++
}
return this.values[start:this.ptr]
}
/**
* Your OrderedStream object will be instantiated and called as such:
* obj := Constructor(n);
* param_1 := obj.Insert(idKey,value);
*/
class OrderedStream {
private:
vector<string> values;
int ptr;
public:
OrderedStream(int n) {
values.resize(n);
ptr = 0;
}
vector<string> insert(int idKey, string value) {
values[idKey - 1] = value;
vector<string> res;
while (ptr < values.size() && values[ptr] != "") {
res.emplace_back(values[ptr]);
++ptr;
}
return res;
}
};
/**
* Your OrderedStream object will be instantiated and called as such:
* OrderedStream* obj = new OrderedStream(n);
* vector param_1 = obj->insert(idKey,value);
*/
class OrderedStream {
private final String[] values;
private int ptr;
public OrderedStream(int n) {
values = new String[n];
ptr = 0;
}
public List<String> insert(int idKey, String value) {
values[idKey - 1] = value;
List<String> res = new ArrayList<>();
while (ptr < values.length && values[ptr] != null) {
res.add(values[ptr]);
++ptr;
}
return res;
}
}
/**
* Your OrderedStream object will be instantiated and called as such:
* OrderedStream obj = new OrderedStream(n);
* List param_1 = obj.insert(idKey,value);
*/
class OrderedStream:
def __init__(self, n: int):
self.values = [""] * n
self.ptr = 0
def insert(self, idKey: int, value: str) -> List[str]:
self.values[idKey - 1] = value
res = []
while self.ptr < len(self.values) and self.values[self.ptr]:
res.append(self.values[self.ptr])
self.ptr += 1
return res
# Your OrderedStream object will be instantiated and called as such:
# obj = OrderedStream(n)
# param_1 = obj.insert(idKey,value)
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