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15 - Advance Matrixs/ex2.c

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+#include "PointersLibs.h"
+
+int SumInSlantUntilNegative(int *ptr_mat, unsigned short rows, unsigned short cols)
+{
+    int max = *ptr_mat;
+    int steps = cols + ONE;
+
+    while (rows-- && (*ptr_mat < ZERO))
+    {
+        max += *ptr_mat;
+        ptr_mat += steps;
+    }
+
+    return (max - *ptr_mat);
+}
+
+int MaxSumSlant(int *ptr_mat, unsigned short rows, unsigned short cols)
+{
+    int *ptr_max_mat = ptr_mat; // Save the pointer of start max
+    int max = *ptr_max_mat;
+
+    unsigned short steps = cols + ONE;
+
+    int *ptr_temp_mat = ptr_mat + steps; // For checking
+    int temp_max = max,
+        temp;
+
+    rows--;
+    for (; rows; rows--)
+    {
+        temp = temp_max + *ptr_temp_mat;
+        if (temp < temp_max || temp_max > temp)
+        {
+            if (temp_max > max)
+            {
+                max = temp_max;
+                ptr_max_mat = ptr_temp_mat;
+            }
+            temp_max = ZERO;
+        }
+        temp_max += *ptr_temp_mat;
+        ptr_temp_mat += steps;
+    }
+}
+
+void main(void)
+{
+    int mat[4][5] = {
+        {1,2,3,4,5},
+        {2,3,4,5,6},
+        {3,4,-1,6,7},
+        {4,5,6,7,8}
+    };
+
+    printf("%d\n", MaxSumInSlant(mat, 4, 5));
+}