public int[][] construct2DArray(int[] original, int m, int n) { int[][] array=new int[m][n]; if(original.length!=m*n) return new int[0][]; int k=0; for (int i = 0; i < m; i++) { for (int j = 0; j < n; j++) { array[i][j]=original[k++]; } } return array; }
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