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feat: add swift solution 2 implementation to lcof2 problem: No.102 (doocs#3615)

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Original file line number	Diff line number	Diff line change
`@@ -241,6 +241,29 @@ func findTargetSumWays(nums []int, target int) int {`
`241`	`241`	`}`
`242`	`242`	```
`243`	`243`
	`244`	`+#### Swift`
	`245`	`+`
	`246`	+```swift
	`247`	`+class Solution {`
	`248`	`+ func findTargetSumWays(_ nums: [Int], _ target: Int) -> Int {`
	`249`	`+ let s = nums.reduce(0, +)`
	`250`	`+ if s - target < 0 \|\| (s - target) % 2 != 0 {`
	`251`	`+ return 0`
	`252`	`+ }`
	`253`	`+ let target = (s - target) / 2`
	`254`	`+ var dp = [Int](repeating: 0, count: target + 1)`
	`255`	`+ dp[0] = 1`
	`256`	`+`
	`257`	`+ for num in nums {`
	`258`	`+ for j in stride(from: target, through: num, by: -1) {`
	`259`	`+ dp[j] += dp[j - num]`
	`260`	`+ }`
	`261`	`+ }`
	`262`	`+ return dp[target]`
	`263`	`+ }`
	`264`	`+}`
	`265`	+```
	`266`	`+`
`244`	`267`	`<!-- tabs:end -->`
`245`	`268`
`246`	`269`	`<!-- solution:end -->`

Lines changed: 18 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,18 @@`
	`1`	`+class Solution {`
	`2`	`+ func findTargetSumWays(_ nums: [Int], _ target: Int) -> Int {`
	`3`	`+ let s = nums.reduce(0, +)`
	`4`	`+ if s - target < 0 \|\| (s - target) % 2 != 0 {`
	`5`	`+ return 0`
	`6`	`+ }`
	`7`	`+ let target = (s - target) / 2`
	`8`	`+ var dp = [Int](repeating: 0, count: target + 1)`
	`9`	`+ dp[0] = 1`
	`10`	`+`
	`11`	`+ for num in nums {`
	`12`	`+ for j in stride(from: target, through: num, by: -1) {`
	`13`	`+ dp[j] += dp[j - num]`
	`14`	`+ }`
	`15`	`+ }`
	`16`	`+ return dp[target]`
	`17`	`+ }`
	`18`	`+}`

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