LeetCode 2986: Find Third Transaction Solution
Master LeetCode problem 2986 (Find Third Transaction), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
2986. Find Third Transaction
Problem Explanation
Explanation:
To find the third transaction in a given list of transactions, we can iterate through the list and keep track of the number of transactions seen so far. Whenever we encounter a new transaction, we increment the count. Once the count reaches 3, we return that transaction. If there are less than 3 transactions in the list, we return null.
- Time complexity: O(N), where N is the number of transactions in the list.
- Space complexity: O(1)
Solution Code
public String findThirdTransaction(String[] transactions) {
int count = 0;
String thirdTransaction = null;
for (String transaction : transactions) {
if (count == 2) {
thirdTransaction = transaction;
break;
}
count++;
}
return thirdTransaction;
}Try It Yourself
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