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feat: add typescript solution to lc problem: No.0049.Group Anagrams (doocs#584)

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Original file line number	Diff line number	Diff line change
`@@ -74,6 +74,23 @@ class Solution {`
`74`	`74`	`}`
`75`	`75`	```
`76`	`76`
	`77`	`+### TypeScript`
	`78`	`+`
	`79`	+```ts
	`80`	`+function groupAnagrams(strs: string[]): string[][] {`
	`81`	`+ let map = new Map();`
	`82`	`+ for (let str of strs) {`
	`83`	`+ let arr = str.split('');`
	`84`	`+ arr.sort();`
	`85`	`+ let key = arr.join('');`
	`86`	`+ let value = map.get(key) ? map.get(key) : [];`
	`87`	`+ value.push(str);`
	`88`	`+ map.set(key, value);`
	`89`	`+ }`
	`90`	`+ return Array.from(map.values());`
	`91`	`+};`
	`92`	+```
	`93`	`+`
`77`	`94`	`### C++`
`78`	`95`
`79`	`96`	```cpp

Lines changed: 17 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -61,6 +61,23 @@ class Solution {`
`61`	`61`	`}`
`62`	`62`	```
`63`	`63`
	`64`	`+### TypeScript`
	`65`	`+`
	`66`	+```ts
	`67`	`+function groupAnagrams(strs: string[]): string[][] {`
	`68`	`+ let map = new Map();`
	`69`	`+ for (let str of strs) {`
	`70`	`+ let arr = str.split('');`
	`71`	`+ arr.sort();`
	`72`	`+ let key = arr.join('');`
	`73`	`+ let value = map.get(key) ? map.get(key) : [];`
	`74`	`+ value.push(str);`
	`75`	`+ map.set(key, value);`
	`76`	`+ }`
	`77`	`+ return Array.from(map.values());`
	`78`	`+};`
	`79`	+```
	`80`	`+`
`64`	`81`	`### C++`
`65`	`82`
`66`	`83`	```cpp

Lines changed: 12 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,12 @@`
	`1`	`+function groupAnagrams(strs: string[]): string[][] {`
	`2`	`+ let map = new Map();`
	`3`	`+ for (let str of strs) {`
	`4`	`+ let arr = str.split('');`
	`5`	`+ arr.sort();`
	`6`	`+ let key = arr.join('');`
	`7`	`+ let value = map.get(key) ? map.get(key) : [];`
	`8`	`+ value.push(str);`
	`9`	`+ map.set(key, value);`
	`10`	`+ }`
	`11`	`+ return Array.from(map.values());`
	`12`	`+};`

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