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feat: add rust solution to lc problem: No.3169 (#4560)

No.3169.Count Days Without Meetings

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Original file line number	Diff line number	Diff line change
`@@ -183,6 +183,29 @@ function countDays(days: number, meetings: number[][]): number {`
`183`	`183`	`}`
`184`	`184`	```
`185`	`185`
	`186`	`+####Rust`
	`187`	`+`
	`188`	+```rust
	`189`	`+implSolution {`
	`190`	`+pubfncount_days(days:i32,mutmeetings:Vec<Vec<i32>>)->i32 {`
	`191`	`+meetings.sort_by_key(\|m\|m[0]);`
	`192`	`+letmutans=0;`
	`193`	`+letmutlast=0;`
	`194`	`+`
	`195`	`+foreinmeetings {`
	`196`	`+letst=e[0];`
	`197`	`+leted=e[1];`
	`198`	`+iflast<st {`
	`199`	`+ans+=st-last-1;`
	`200`	`+ }`
	`201`	`+last=last.max(ed);`
	`202`	`+ }`
	`203`	`+`
	`204`	`+ans+ (days-last)`
	`205`	`+ }`
	`206`	`+}`
	`207`	+```
	`208`	`+`
`186`	`209`	`<!-- tabs:end -->`
`187`	`210`
`188`	`211`	`<!-- solution:end -->`

Lines changed: 23 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -181,6 +181,29 @@ function countDays(days: number, meetings: number[][]): number {`
`181`	`181`	`}`
`182`	`182`	```
`183`	`183`
	`184`	`+####Rust`
	`185`	`+`
	`186`	+```rust
	`187`	`+implSolution {`
	`188`	`+pubfncount_days(days:i32,mutmeetings:Vec<Vec<i32>>)->i32 {`
	`189`	`+meetings.sort_by_key(\|m\|m[0]);`
	`190`	`+letmutans=0;`
	`191`	`+letmutlast=0;`
	`192`	`+`
	`193`	`+foreinmeetings {`
	`194`	`+letst=e[0];`
	`195`	`+leted=e[1];`
	`196`	`+iflast<st {`
	`197`	`+ans+=st-last-1;`
	`198`	`+ }`
	`199`	`+last=last.max(ed);`
	`200`	`+ }`
	`201`	`+`
	`202`	`+ans+ (days-last)`
	`203`	`+ }`
	`204`	`+}`
	`205`	+```
	`206`	`+`
`184`	`207`	`<!-- tabs:end -->`
`185`	`208`
`186`	`209`	`<!-- solution:end -->`

Lines changed: 18 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,18 @@`
	`1`	`+implSolution{`
	`2`	`+pubfncount_days(days:i32,mutmeetings:Vec<Vec<i32>>) ->i32{`
	`3`	`+ meetings.sort_by_key(\|m\| m[0]);`
	`4`	`+letmut ans =0;`
	`5`	`+letmut last =0;`
	`6`	`+`
	`7`	`+for ein meetings{`
	`8`	`+let st = e[0];`
	`9`	`+let ed = e[1];`
	`10`	`+if last < st{`
	`11`	`+ ans += st - last -1;`
	`12`	`+}`
	`13`	`+ last = last.max(ed);`
	`14`	`+}`
	`15`	`+`
	`16`	`+ ans +(days - last)`
	`17`	`+}`
	`18`	`+}`

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