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Improve input validation and output message in BalancedBrackets #3

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Improve input validation and output message in BalancedBrackets #3

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07adb9c
Add input validation to coin change method
HemanthBikkina Jan 5, 2026
4e5d756
Handle null and odd-length input in BalancedBrackets
HemanthBikkina Jan 5, 2026
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6 changes: 5 additions & 1 deletion DataStructures/Stacks/BalancedBrackets.java
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,9 @@ class BalancedBrackets {
* @return
*/
static boolean is_balanced(String s) {
if (s == null || s.length() % 2 != 0) {
return false;
}
Stack<Character> bracketsStack = new Stack<>();
char[] text = s.toCharArray();
for (char x : text) {
Expand Down Expand Up @@ -82,8 +85,9 @@ public static void main(String args[]) {
if (is_balanced(s)) {
System.out.println(s + " is balanced");
} else {
System.out.println(s + " ain't balanced");
System.out.println(s + " isn't balanced");
}
in.close();
}
}
}
4 changes: 4 additions & 0 deletions DynamicProgramming/CoinChange.java
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,10 @@ public static void main(String[] args) {
**/
public static int change(int[] coins, int amount) {

if(amount<0&& coins==null||coins.length==0)
{
return 0;
}
int[] combinations = new int[amount + 1];
combinations[0] = 1;

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9 changes: 7 additions & 2 deletions Searches/SaddlebackSearch.java
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Expand Up @@ -59,11 +59,16 @@ else if (arr[row][col] > key) {
*
* @param args Command line arguments
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
int arr[][];
int i, j, rows = sc.nextInt(), col = sc.nextInt();
if(rows<=0 || col<=0)
{
System.out.println("Invalid Input");
return;
}
arr = new int[rows][col];
for (i = 0; i < rows; i++) {
for (j = 0; j < col; j++) {
Expand Down