SetMatrixZeroes.java ( File view )

  • By issaczr 2014-10-24
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			// Author:   Li Long, 1988lilong@163.com
// Date:     Apr 17, 2014
// Source:   http://oj.leetcode.com/problems/set-matrix-zeroes/
// Analysis: http://blog.csdn.net/lilong_dream/article/details/22744137

// Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place.
// Follow up:
// Did you use extra space?
// A straight forward solution using O(mn) space is probably a bad idea.
// A simple improvement uses O(m + n) space, but still not the best solution.
// Could you devise a constant space solution? 

public class SetMatrixZeroes {

	public void setZeroes(int[][] matrix) {

		int m = matrix.length;
		int n = matrix[0].length;
		boolean row = false;
		boolean column = false;

		for (int i = 0; i < m; ++i) {

			if (matrix[i][0] == 0) {

				row = true;
				break;
			
}
		
}

		for (int j = 0; j < n; ++j) {

			if (matrix[0][j] == 0) {

				column = true;
				break;
			
}
		
}

		for (int i = 1; i < m; ++i)
			for (int j = 1; j < n; ++j) {

				if (matrix[i][j] == 0) {

					matrix[i][0] = 0;
					matrix[0][j] = 0;
				
}
			
}

		for (int i = 1; i < m; ++i) {

			if (matrix[i][0] == 0) {

				for (int j = 1; j < n; ++j) {

					matrix[i][j] = 0;
				
}
			
}
		
}

		for (int j = 1; j < n; ++j) {

			if (matrix[0][j] == 0) {

				for (int i = 1; i < m; ++i) {

					matrix[i][j] = 0;
				
}
			
}
		
}

		if (row) {

			for (int i = 0; i < m; ++i) {

				matrix[i][0] = 0;
			
}
		
}

		if (column) {

			for (int j = 0; j < n; ++j) {

				matrix[0][j] = 0;
			
}
		
}
	
}
	
	public static void main(String[] args) {

		SetMatrixZeroes slt = new SetMatrixZeroes();
		int[][] matrix = new int[][]{
 {
1, 1, 1, 1
},
								      {
1, 0, 1, 1
},
								      {
1, 1, 1, 1
},
								      {
1, 1, 1, 0
} 
};
		slt.setZeroes(matrix);
		for (int i = 0; i < matrix.length; ++i) {

			for (int j = 0; j < matrix[0].length; ++j) {

				System.out.print(matrix[i][j] + " ");
			
}
			System.out.println();
		
}
	
}

}			
...
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