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Create Flip Square Submatrix Vertically.java

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	`1`	`+class Solution {`
	`2`	`+ public int[][] reverseSubmatrix(int[][] grid, int x, int y, int k) {`
	`3`	`+ for (int j = y; j < y + k; j++) {`
	`4`	`+ int top = x;`
	`5`	`+ int bottom = x + k - 1;`
	`6`	`+ while (top < bottom) {`
	`7`	`+ int temp = grid[top][j];`
	`8`	`+ grid[top][j] = grid[bottom][j];`
	`9`	`+ grid[bottom][j] = temp;`
	`10`	`+ top++;`
	`11`	`+ bottom--;`
	`12`	`+ }`
	`13`	`+ }`
	`14`	`+ return grid;`
	`15`	`+ }`
	`16`	`+}`

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