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feat: add rust solution to lc problem: No.2240 (#1562)

No.2240.Number of Ways to Buy Pens and Pencils

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Original file line number	Diff line number	Diff line change
`@@ -122,6 +122,20 @@ function waysToBuyPensPencils(total: number, cost1: number, cost2: number): numb`
`122`	`122`	`}`
`123`	`123`	```
`124`	`124`
	`125`	`+### Rust`
	`126`	`+`
	`127`	+```rust
	`128`	`+impl Solution {`
	`129`	`+ pub fn ways_to_buy_pens_pencils(total: i32, cost1: i32, cost2: i32) -> i64 {`
	`130`	`+ let mut ans: i64 = 0;`
	`131`	`+ for pen in 0..=total / cost1 {`
	`132`	`+ ans += ((total - pen * cost1) / cost2) as i64 + 1;`
	`133`	`+ }`
	`134`	`+ ans`
	`135`	`+ }`
	`136`	`+}`
	`137`	+```
	`138`	`+`
`125`	`139`	`### ...`
`126`	`140`
`127`	`141`	```

Lines changed: 14 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -108,6 +108,20 @@ function waysToBuyPensPencils(total: number, cost1: number, cost2: number): numb`
`108`	`108`	`}`
`109`	`109`	```
`110`	`110`
	`111`	`+### Rust`
	`112`	`+`
	`113`	+```rust
	`114`	`+impl Solution {`
	`115`	`+ pub fn ways_to_buy_pens_pencils(total: i32, cost1: i32, cost2: i32) -> i64 {`
	`116`	`+ let mut ans: i64 = 0;`
	`117`	`+ for pen in 0..=total / cost1 {`
	`118`	`+ ans += ((total - pen * cost1) / cost2) as i64 + 1;`
	`119`	`+ }`
	`120`	`+ ans`
	`121`	`+ }`
	`122`	`+}`
	`123`	+```
	`124`	`+`
`111`	`125`	`### ...`
`112`	`126`
`113`	`127`	```

Lines changed: 9 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,9 @@`
	`1`	`+impl Solution {`
	`2`	`+ pub fn ways_to_buy_pens_pencils(total: i32, cost1: i32, cost2: i32) -> i64 {`
	`3`	`+ let mut ans: i64 = 0;`
	`4`	`+ for pen in 0..=total / cost1 {`
	`5`	`+ ans += ((total - pen * cost1) / cost2) as i64 + 1;`
	`6`	`+ }`
	`7`	`+ ans`
	`8`	`+ }`
	`9`	`+}`

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