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Update README.md

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`@@ -210,6 +210,30 @@ impl Solution {`
`210`	`210`	`}`
`211`	`211`	```
`212`	`212`
	`213`	`+#### JavaScript`
	`214`	`+`
	`215`	+```js
	`216`	`+/**`
	`217`	`+ * @param {string} s`
	`218`	`+ * @param {string[]} dictionary`
	`219`	`+ * @return {number}`
	`220`	`+ */`
	`221`	`+var minExtraChar = function (s, dictionary) {`
	`222`	`+ const ss = new Set(dictionary);`
	`223`	`+ const n = s.length;`
	`224`	`+ const f = Array(n + 1).fill(0);`
	`225`	`+ for (let i = 1; i <= n; ++i) {`
	`226`	`+ f[i] = f[i - 1] + 1;`
	`227`	`+ for (let j = 0; j < i; ++j) {`
	`228`	`+ if (ss.has(s.slice(j, i))) {`
	`229`	`+ f[i] = Math.min(f[i], f[j]);`
	`230`	`+ }`
	`231`	`+ }`
	`232`	`+ }`
	`233`	`+ return f[n];`
	`234`	`+};`
	`235`	+```
	`236`	`+`
`213`	`237`	`<!-- tabs:end -->`
`214`	`238`
`215`	`239`	`<!-- solution:end -->`

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