Java Code of hourglass_challenge_java

hourglass_challenge_java

@@ -1,50 +1,39 @@
-// C++ program to find maximum sum of hour 
-// glass in matrix 
-#include<bits/stdc++.h> 
-using namespace std; 
-const int R = 5; 
-const int C = 5; 
-
-// Returns maximum sum of hour glass in ar[][] 
-int findMaxSum(int mat[R][C]) 
-{ 
-	if (R<3 || C<3) 
-		return -1; 
-
-	// Here loop runs (R-2)*(C-2) times considering 
-	// different top left cells of hour glasses. 
-	int max_sum = INT_MIN; 
-	for (int i=0; i<R-2; i++) 
-	{ 
-		for (int j=0; j<C-2; j++) 
-		{ 
-			// Considering mat[i][j] as top left cell of 
-			// hour glass. 
-			int sum = (mat[i][j]+mat[i][j+1]+mat[i][j+2])+ 
-					(mat[i+1][j+1])+ 
-				(mat[i+2][j]+mat[i+2][j+1]+mat[i+2][j+2]); 
-
-			// If previous sum is less then current sum then 
-			// update new sum in max_sum 
-			max_sum = max(max_sum, sum); 
-		} 
-	} 
-	return max_sum; 
-} 
-
-// Driver code 
-int main() 
-{ 
-	int mat[][C] = {{1, 2, 3, 0, 0}, 
-					{0, 0, 0, 0, 0}, 
-					{2, 1, 4, 0, 0}, 
-					{0, 0, 0, 0, 0}, 
-					{1, 1, 0, 1, 0}}; 
-	int res = findMaxSum(mat); 
-	if (res == -1) 
-		cout << "Not possible" << endl; 
-	else
-		cout << "Maximum sum of hour glass = "
-			<< res << endl; 
-	return 0; 
-} 
+import java.util.*;
+
+public class Solution {
+
+    // Returns maximum sum of hour glass in ar[][] 
+
+    public static int hourglass(int[][] arr,int R,int C){
+        int ans = Integer.MIN_VALUE;
+        for(int i=0;i<R-2;i++){
+            for(int j=0;j<C-2;j++){
+
+                // Considering arr[i][j] as top left cell of 
+            // hour glass.
+
+
+                int sum= arr[i][j]+arr[i][j+1]+arr[i][j+2]+ arr[i+1][j+1]+arr[i+2][j]+arr[i+2][j+1]+arr[i+2][j+2];
+
+             ans=Math.max(ans,sum);   //If previous sum is less then current sum i.e. ans then update new sum in ans   
+            }
+        }
+        return ans;
+    }
+
+    private static final Scanner scanner = new Scanner(System.in);
+
+    public static void main(String[] args) {
+        int[][] arr = {{1, 1, 1, 0, 0},
+                        {0, 1 ,0, 0 ,0},
+                        {1 ,1 ,1 ,0 ,0},
+                        {0 ,0 ,0, 0, 0},
+                        {0 ,0, 0 ,0, 0 }};
+
+    int R=arr.length;   // No of rows in Matrix
+
+    int C=arr[0].length;  // No of Columns in matrix
+
+        System.out.print(hourglass(arr,R,C));
+    }
+}