59. Spiral Matrix II
2016-12-13 14:55
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public int[][] generateMatrix(int n) { if(n <= 0) { return new int[0][0]; } int start = 1; int[][] matrix = new int ; int count = (n%2 == 0 ?n/2:n/2+1); for(int i = 0; i < count;i++) { start = fillNumber(matrix, i,i,n-1-i,n-1-i,start); } return matrix; } public int fillNumber(int[][] matrix, int rol1,int col1,int rol2, int col2,int start) { if(rol1 == rol2 && col1 == col2 && rol1 == col1) { matrix[rol1][rol1] = start; }else { for(int j = col1; j <= col2; j++ ) { matrix[rol1][j] = start++; } for(int i = rol1+1; i < rol2; i++) { matrix[i][col2] = start++; } for(int j = col2; j >= col1; j--) { matrix[rol2][j] = start++; } for(int i = rol2-1; i >rol1; i--) { matrix[i][col1] = start++; } } return start; }
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