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840. Magic Squares In Grid

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	`1`	`+const numMagicSquaresInside = grid => {`
	`2`	`+ const magicSquares = new Set([`
	`3`	`+ '276951438',`
	`4`	`+ '294753618',`
	`5`	`+ '438951276',`
	`6`	`+ '492357816',`
	`7`	`+ '618753294',`
	`8`	`+ '672159834',`
	`9`	`+ '816357492',`
	`10`	`+ '834159672',`
	`11`	`+ ]);`
	`12`	`+ let cnt = 0;`
	`13`	`+ for (let i = 0; i < grid.length - 2; i++)`
	`14`	`+ for (let j = 0; j < grid[0].length - 2; j++)`
	`15`	`+ if (`
	`16`	`+ magicSquares.has(`
	`17`	`+ grid[i][j].toString() +`
	`18`	`+ grid[i][j + 1] +`
	`19`	`+ grid[i][j + 2] +`
	`20`	`+ grid[i + 1][j] +`
	`21`	`+ grid[i + 1][j + 1] +`
	`22`	`+ grid[i + 1][j + 2] +`
	`23`	`+ grid[i + 2][j] +`
	`24`	`+ grid[i + 2][j + 1] +`
	`25`	`+ grid[i + 2][j + 2],`
	`26`	`+ )`
	`27`	`+ )`
	`28`	`+ cnt++;`
	`29`	`+ return cnt;`
	`30`	`+};`

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