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feat: add ts solution to lc problem: No.0078 (doocs#3213)

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Original file line number	Diff line number	Diff line change
`@@ -315,4 +315,27 @@ function subsets(nums: number[]): number[][] {`
`315`	`315`
`316`	`316`	`<!-- solution:end -->`
`317`	`317`
	`318`	`+<!-- solution:start -->`
	`319`	`+`
	`320`	`+### 方法三`
	`321`	`+`
	`322`	`+<!-- tabs:start -->`
	`323`	`+`
	`324`	`+#### TypeScript`
	`325`	`+`
	`326`	+```ts
	`327`	`+function subsets(nums: number[]): number[][] {`
	`328`	`+ const res: number[][] = [[]];`
	`329`	`+ for (const x of nums) {`
	`330`	`+ res.push(...res.map(arr => [...arr, x]));`
	`331`	`+ }`
	`332`	`+`
	`333`	`+ return res;`
	`334`	`+}`
	`335`	+```
	`336`	`+`
	`337`	`+<!-- tabs:end -->`
	`338`	`+`
	`339`	`+<!-- solution:end -->`
	`340`	`+`
`318`	`341`	`<!-- problem:end -->`

Lines changed: 23 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -313,4 +313,27 @@ function subsets(nums: number[]): number[][] {`
`313`	`313`
`314`	`314`	`<!-- solution:end -->`
`315`	`315`
	`316`	`+<!-- solution:start -->`
	`317`	`+`
	`318`	`+### Solution 3`
	`319`	`+`
	`320`	`+<!-- tabs:start -->`
	`321`	`+`
	`322`	`+#### TypeScript`
	`323`	`+`
	`324`	+```ts
	`325`	`+function subsets(nums: number[]): number[][] {`
	`326`	`+ const res: number[][] = [[]];`
	`327`	`+ for (const x of nums) {`
	`328`	`+ res.push(...res.map(arr => [...arr, x]));`
	`329`	`+ }`
	`330`	`+`
	`331`	`+ return res;`
	`332`	`+}`
	`333`	+```
	`334`	`+`
	`335`	`+<!-- tabs:end -->`
	`336`	`+`
	`337`	`+<!-- solution:end -->`
	`338`	`+`
`316`	`339`	`<!-- problem:end -->`

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`@@ -0,0 +1,8 @@`
	`1`	`+function subsets(nums: number[]): number[][] {`
	`2`	`+ const res: number[][] = [[]];`
	`3`	`+ for (const x of nums) {`
	`4`	`+ res.push(...res.map(arr => [...arr, x]));`
	`5`	`+ }`
	`6`	`+`
	`7`	`+ return res;`
	`8`	`+}`

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