1 files changed, 46 insertions, 0 deletions
diff --git a/euler11.c b/euler11.c
new file mode 100644
index 0000000..ea43b48
--- /dev/null
+++ b/euler11.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#define MAX 20
+
+int grid[MAX][MAX];
+int biggest[MAX][MAX];
+
+int main()
+{
+	int i,j,M=0;
+	for (i=0;i<MAX;++i){
+		for (j=0;j<MAX;++j){
+			scanf("%d",&grid[i][j]);
+		}
+	}
+	for (i=0;i<MAX;++i){
+		for (j=0;j<MAX;++j){
+			int p;
+			biggest[i][j]=0;
+			if (i<MAX-3){
+				p = grid[i][j]*grid[i+1][j]*grid[i+2][j]*grid[i+3][j];
+			}
+			if (j<MAX-3){
+				p = grid[i][j]*grid[i][j+1]*grid[i][j+2]*grid[i][j+3];
+				if (p>biggest[i][j])
+					biggest[i][j]=p;
+				if (i<MAX-3){
+					p = grid[i][j]*grid[i+1][j+1]*
+						grid[i+2][j+2]*grid[i+3][j+3];
+					if (p>biggest[i][j])
+						biggest[i][j]=p;
+				}
+				if (i>=3){
+					p = grid[i][j]*grid[i-1][j+1]*
+						grid[i-2][j+2]*grid[i-3][j+3];
+					if (p>biggest[i][j])
+						biggest[i][j]=p;
+				}
+			}
+			if (biggest[i][j]>M)
+				M=biggest[i][j];
+		}
+	}
+	printf("%d\n",M);
+	return 0;
+}
+