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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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