Solution for: Num matrix

Author: edyluisrey

src/leetcode/NumMatrix.java

@@ -0,0 +1,28 @@
+package leetcode;
+
+public class NumMatrix {
+	   private int[][] matrix;
+	   public NumMatrix(int[][] matrix) {
+	        this.matrix = matrix;
+	   }
+	    
+	    public int sumRegion(int row1, int col1, int row2, int col2) {
+	        int sum=0;
+	        for(int i= row1; i<=row2;i++){
+	        	for(int j= col1; j<=col2;j++){
+	        		sum = sum+ matrix[i][j];
+	        	}	        		
+	        }
+	        return sum;
+	    }
+	    
+	    public static void main(String[] args) {
+	    	int[][] matrix = new int[][]{{3, 0, 1, 4, 2},{5, 6, 3, 2, 1},
+	    								{1, 2, 0, 1, 5},{4, 1, 0, 1, 7},{1, 0, 3, 0, 5} };
+	    	NumMatrix  test = new NumMatrix(matrix); 
+	    	System.out.println(test.sumRegion(2, 1, 4, 3));
+	    	System.out.println(test.sumRegion(1, 1, 2, 2));
+	    	System.out.println(test.sumRegion(1, 2, 2, 4));
+	    }
+
+}