#problem-solving-skills
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An example of using unordered_map in C++ ยท Problem statement Given a string s, find the length of the longest substring without repeating...
Problem statement Given an integer array arr, and an integer target, return the number of tuples i, j, k such that i < j < k and arr[i] + arr[j] +...
Problem statement You are given two strings s and t. String t is generated by random shuffling string s and then adding one more letter at a random...
Problem statement Given the head of a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the...
Problem statement Given n orders, each order consists of pickup and delivery services. Count all valid pickup/delivery possible sequences such that...
Problem statement Given an integer num, repeatedly add all its digits until the result has only one digit, and return it. Example 1 Input: num =...
