[BUGFIX] sonarcloud: Fix this access on a collection that may trigger an 'ArrayIndexOutOfBoundsException'.

Accessing an array element should not trigger an ArrayIndexOutOfBoundsException javabugs:S6466

Author: Gonzalo Diaz

algorithm-exercises-java/src/main/java/ae/projecteuler/Problem0015.java

@@ -16,7 +16,8 @@ private Problem0015() {}
    */
   public static Long problem0015(Integer gridSide) {
 
-    Long[][] grid = new Long[gridSide + 1][gridSide + 1];
+    int limit = gridSide + 1;
+    Long[][] grid = new Long[limit][limit];
 
     // initialization
     for (int i = 0; i <= gridSide; i++) {
@@ -26,16 +27,16 @@ public static Long problem0015(Integer gridSide) {
     }
 
     // vertex computing
-    for (int i = 1; i <= gridSide; i++) {
-      for (int j = 1; j <= gridSide; j++) {
+    for (int i = 1; i < limit; i++) {
+      for (int j = 1; j < limit; j++) {
         long upperParent = grid[i - 1][j];
         long leftParent = grid[i][j - 1];
 
         grid[i][j] = upperParent + leftParent;
       }
     }
 
-    Long result = grid[gridSide][gridSide];
+    Long result = grid[grid.length - 1][grid.length - 1];
 
     String log;
     log = String.format("Problem 00015 solved: %d", result);