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    📊 Arrays — Practice Problems

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    45
    Total
    16
    Solved
    8
    Easy
    30
    Medium
    7
    Hard

    🟢 Easy

    #121 Best Time to Buy and Sell Stock ✓ Solved
    Easy arrays sliding window
    🔗 Problem No notes yet
    #125 Valid Palindrome ✓ Solved
    Easy arrays two pointers strings
    🔗 Problem No notes yet
    #169 Majority Element ✓ Solved
    Easy searching sorting arrays
    🔗 Problem 💻 Solution
    #88 Merge Sorted Array ✓ Solved
    Easy searching sorting arrays two pointers
    🔗 Problem 💻 Solution
    #2389 Longest Subsequence With Limited Sum ○ Todo
    Easy binary search arrays
    🔗 Problem No notes yet
    #1 Two Sum ○ Todo
    Easy hashing arrays
    🔗 Problem No notes yet
    #268 Missing Number ○ Todo
    Easy hashing arrays bit manipulation
    🔗 Problem No notes yet
    #1426 Counting Elements ○ Todo
    Easy hashing arrays
    🔗 Problem No notes yet

    🟡 Medium

    #3 Longest Substring Without Repeating Characters ✓ Solved
    Medium arrays sliding window strings
    🔗 Problem 💻 Solution
    #424 Longest Repeating Character Replacement ✓ Solved
    Medium arrays sliding window strings
    🔗 Problem No notes yet
    #567 Permutation in String ✓ Solved
    Medium arrays sliding window strings
    🔗 Problem No notes yet
    #904 Fruit Into Baskets ○ Todo
    Medium arrays sliding window
    🔗 Problem No notes yet
    #560 Subarray Sum Equals K ○ Todo
    Medium arrays sliding window hashing
    🔗 Problem No notes yet
    #930 Binary Subarrays With Sum ○ Todo
    Medium arrays sliding window
    🔗 Problem No notes yet
    #209 Minimum Size Subarray Sum ○ Todo
    Medium arrays sliding window
    🔗 Problem No notes yet
    #167 Two Sum II - Input Array Is Sorted ✓ Solved
    Medium arrays two pointers
    🔗 Problem No notes yet
    #15 3Sum ✓ Solved
    Medium arrays two pointers
    🔗 Problem No notes yet
    #11 Container With Most Water ✓ Solved
    Medium arrays two pointers
    🔗 Problem No notes yet
    #gfg-search-matrix Search in Row-Column Sorted Matrix ✓ Solved
    Medium searching sorting arrays
    🔗 Problem No notes yet
    #74 Search a 2D Matrix ✓ Solved
    Medium searching sorting arrays
    🔗 Problem No notes yet
    #179 Largest Number ✓ Solved
    Medium searching sorting arrays
    🔗 Problem 💻 Solution
    #75 Sort Colors ✓ Solved
    Medium searching sorting arrays two pointers
    🔗 Problem 💻 Solution
    #200 Number of Islands ○ Todo
    Medium graphs arrays
    🔗 Problem No notes yet
    #695 Max Area of Island ○ Todo
    Medium graphs arrays
    🔗 Problem No notes yet
    #1631 Path With Minimum Effort ○ Todo
    Medium graphs arrays
    🔗 Problem No notes yet
    #1926 Nearest Exit from Entrance in Maze ○ Todo
    Medium graphs arrays
    🔗 Problem No notes yet
    #1306 Jump Game III ○ Todo
    Medium graphs arrays
    🔗 Problem No notes yet
    #2101 Detonate the Maximum Bombs ○ Todo
    Medium graphs arrays
    🔗 Problem No notes yet
    #79 Word Search ○ Todo
    Medium backtracking arrays
    🔗 Problem No notes yet
    #714 Best Time to Buy and Sell Stock with Transaction Fee ○ Todo
    Medium dynamic programming arrays
    🔗 Problem No notes yet
    #309 Best Time to Buy and Sell Stock with Cooldown ○ Todo
    Medium dynamic programming arrays
    🔗 Problem No notes yet
    #63 Unique Paths II ○ Todo
    Medium dynamic programming arrays
    🔗 Problem No notes yet
    #931 Minimum Falling Path Sum ○ Todo
    Medium dynamic programming arrays
    🔗 Problem No notes yet
    #347 Top K Frequent Elements ○ Todo
    Medium hashing arrays
    🔗 Problem No notes yet
    #2225 Find Players With Zero or One Losses ○ Todo
    Medium hashing arrays
    🔗 Problem No notes yet
    #215 Kth Largest Element in an Array ○ Todo
    Medium heaps arrays
    🔗 Problem No notes yet
    #973 K Closest Points to Origin ○ Todo
    Medium heaps arrays
    🔗 Problem No notes yet
    #1962 Remove Stones to Minimize the Total ○ Todo
    Medium heaps arrays
    🔗 Problem No notes yet

    🔴 Hard

    #76 Minimum Window Substring ✓ Solved
    Hard arrays sliding window strings
    🔗 Problem No notes yet
    #992 Subarrays with K Different Integers ○ Todo
    Hard arrays sliding window
    🔗 Problem No notes yet
    #340 Longest Substring with At Most K Distinct Characters ○ Todo
    Hard arrays sliding window strings
    🔗 Problem No notes yet
    #1004 Max Consecutive Ones III ○ Todo
    Hard arrays sliding window
    🔗 Problem No notes yet
    #1248 Count Number of Nice Subarrays ○ Todo
    Hard arrays sliding window
    🔗 Problem No notes yet
    #42 Trapping Rain Water ✓ Solved
    Hard arrays two pointers
    🔗 Problem No notes yet
    #239 Sliding Window Maximum ○ Todo
    Hard queues arrays sliding window
    🔗 Problem No notes yet
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