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661. Image Smoother

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	`1`	`+/**`
	`2`	`+ * 661. Image Smoother`
	`3`	`+ * https://leetcode.com/problems/image-smoother/`
	`4`	`+ * @param {number[][]} M`
	`5`	`+ * @return {number[][]}`
	`6`	`+ */`
	`7`	`+`
	`8`	`+var imageSmoother = function (M) {`
	`9`	`+ const res = [];`
	`10`	`+ let count = 0;`
	`11`	`+ let sum = 0;`
	`12`	`+ for (let i = 0; i < M.length; i++) {`
	`13`	`+ res[i] = [];`
	`14`	`+ for (let j = 0; j < M[0].length; j++) {`
	`15`	`+ count = 0;`
	`16`	`+ sum = 0;`
	`17`	`+ for (let m = i - 1; m <= i + 1; m++) {`
	`18`	`+ for (let n = j - 1; n <= j + 1; n++) {`
	`19`	`+ if (m >= 0 && m < M.length && n >= 0 && n < M[0].length) {`
	`20`	`+ count++;`
	`21`	`+ sum += M[m][n];`
	`22`	`+ }`
	`23`	`+ }`
	`24`	`+ }`
	`25`	`+ res[i][j] = Math.floor(sum / count);`
	`26`	`+ }`
	`27`	`+ }`
	`28`	`+ return res;`
	`29`	`+};`

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