_1290.java

packagecom.fishercoder.solutions.secondthousand;

importcom.fishercoder.common.classes.ListNode;

publicclass_1290 {
publicstaticclassSolution1 {
publicintgetDecimalValue(ListNodehead) {
StringBuildersb = newStringBuilder();
while (head != null) {
sb.append(head.val);
head = head.next;
 }
returnInteger.parseInt(sb.toString(), 2);
 }
 }

publicstaticclassSolution2 {
publicintgetDecimalValue(ListNodehead) {
intsum = 0;
while (head != null) {
sum *= 2;
sum += head.val;
head = head.next;
 }
returnsum;
 }
 }
}