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feat: add solutions to lc problem: No.1227 (doocs#3600)

No.1227.Airplane Seat Assignment Probability

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`@@ -142,6 +142,8 @@ f(n) = \begin{cases}`
`142`	`142`	`\end{cases}`
`143`	`143`	`$$`
`144`	`144`
	`145`	`+时间复杂度 $O(1),ドル空间复杂度 $O(1)$。`
	`146`	`+`
`145`	`147`	`<!-- tabs:start -->`
`146`	`148`
`147`	`149`	`#### Python3`
`@@ -184,6 +186,24 @@ func nthPersonGetsNthSeat(n int) float64 {`
`184`	`186`	`}`
`185`	`187`	```
`186`	`188`
	`189`	`+#### TypeScript`
	`190`	`+`
	`191`	+```ts
	`192`	`+function nthPersonGetsNthSeat(n: number): number {`
	`193`	`+ return n === 1 ? 1 : 0.5;`
	`194`	`+}`
	`195`	+```
	`196`	`+`
	`197`	`+#### Rust`
	`198`	`+`
	`199`	+```rust
	`200`	`+impl Solution {`
	`201`	`+ pub fn nth_person_gets_nth_seat(n: i32) -> f64 {`
	`202`	`+ return if n == 1 { 1.0 } else { 0.5 };`
	`203`	`+ }`
	`204`	`+}`
	`205`	+```
	`206`	`+`
`187`	`207`	`<!-- tabs:end -->`
`188`	`208`
`189`	`209`	`<!-- solution:end -->`

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`@@ -136,6 +136,8 @@ f(n) = \begin{cases}`
`136`	`136`	`\end{cases}`
`137`	`137`	`$$`
`138`	`138`
	`139`	`+The time complexity of this solution is $O(1),ドル and the space complexity is $O(1)$.`
	`140`	`+`
`139`	`141`	`<!-- tabs:start -->`
`140`	`142`
`141`	`143`	`#### Python3`
`@@ -178,6 +180,24 @@ func nthPersonGetsNthSeat(n int) float64 {`
`178`	`180`	`}`
`179`	`181`	```
`180`	`182`
	`183`	`+#### TypeScript`
	`184`	`+`
	`185`	+```ts
	`186`	`+function nthPersonGetsNthSeat(n: number): number {`
	`187`	`+ return n === 1 ? 1 : 0.5;`
	`188`	`+}`
	`189`	+```
	`190`	`+`
	`191`	`+#### Rust`
	`192`	`+`
	`193`	+```rust
	`194`	`+impl Solution {`
	`195`	`+ pub fn nth_person_gets_nth_seat(n: i32) -> f64 {`
	`196`	`+ return if n == 1 { 1.0 } else { 0.5 };`
	`197`	`+ }`
	`198`	`+}`
	`199`	+```
	`200`	`+`
`181`	`201`	`<!-- tabs:end -->`
`182`	`202`
`183`	`203`	`<!-- solution:end -->`

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`@@ -0,0 +1,5 @@`
	`1`	`+impl Solution {`
	`2`	`+ pub fn nth_person_gets_nth_seat(n: i32) -> f64 {`
	`3`	`+ return if n == 1 { 1.0 } else { 0.5 };`
	`4`	`+ }`
	`5`	`+}`

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`@@ -0,0 +1,3 @@`
	`1`	`+function nthPersonGetsNthSeat(n: number): number {`
	`2`	`+ return n === 1 ? 1 : 0.5;`
	`3`	`+}`

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