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Problem Solving. {"payload":{"allShortcutsEnabled":false,"fileTree":{"certificates/problem-solving-basic/subarray-sums":{"items":[{"name":"test-cases","path":"certificates/problem. def filledOrders (order, k): total = 0 for i, v in enumerate (sorted (order)): if total + v <= k: total += v # total stays. 1 <= a[i] < 10^6 . {"payload":{"allShortcutsEnabled":false,"fileTree":{"certificates/problem-solving-basic/password-decryption":{"items":[{"name":"test-cases","path":"certificates. Pattern; public class Solution { public static void isValidUsername(String s) { // Regular expression pattern to match valid usernames. Stop if iis more than or equal to the string length. This is the java solution for the Hackerrank problem - Quicksort 2 - Sorting - Hackerrank Challenge - Java Solution. 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