Easy Coding Problems

Practice 95 easy coding problems on Code Arena — each with a live judge, worked examples, and a solution editorial.

• Sum of Two — Easy · Math, Implementation
• Greeting — Easy · Strings, Implementation
• Reverse a String — Easy · Strings, Implementation
• FizzBuzz — Easy · Implementation, Math
• Count the Vowels — Easy · Strings
• Sort the Array — Easy · Sorting, Arrays
• Array Sum — Easy · Arrays, Math
• Max of Three — Easy · Implementation
• Even or Odd — Easy · Math
• Count Words — Easy · Strings
• Sum of Digits — Easy · Math, Strings
• Factorial — Easy · Math
• Minimum of an Array — Easy · Arrays
• Multiply Two — Easy · Math
• Absolute Value — Easy · Math
• Last Digit — Easy · Math
• To Uppercase — Easy · Strings
• Leap Year — Easy · Math, Implementation
• Count Even Numbers — Easy · Arrays
• Sum of a Range — Easy · Math
• Character Count — Easy · Strings
• Two Sum — Easy · Arrays, Hashing
• Best Time to Buy and Sell Stock — Easy · Arrays, Dynamic Programming
• Contains Duplicate — Easy · Arrays, Hashing
• Move Zeroes — Easy · Arrays, Two Pointers
• Plus One — Easy · Arrays, Math
• Merge Two Sorted Arrays — Easy · Arrays, Sorting
• Length of Last Word — Easy · Strings
• Shopping Cart Total — Easy · Arrays, Math
• Apply a Discount — Easy · Math
• Add Sales Tax — Easy · Math
• Passing Students — Easy · Arrays
• Class Average — Easy · Arrays, Math
• Temperature Swing — Easy · Arrays
• Low Stock Alert — Easy · Arrays
• Pagination — Easy · Math
• Unique Visitors — Easy · Hashing, Strings
• DNA Mutations — Easy · Strings
• GC Content — Easy · Strings, Math
• Distinct Words — Easy · Hashing, Strings
• Spend and Save — Easy · Math
• Tip Total — Easy · Math, Implementation
• Change Due — Easy · Math
• Seconds to HH:MM:SS — Easy · Implementation, Math
• Discounted Price — Easy · Math
• Letter Grade — Easy · Implementation
• Count Uppercase Letters — Easy · Strings
• Account Balance — Easy · Arrays, Math
• RGB to Hex Color — Easy · Strings, Implementation, Math
• Title Case — Easy · Strings
• Parking Fee — Easy · Math, Implementation
• Longest Word — Easy · Strings
• Product of Digits — Easy · Math, Strings
• Sum of Multiples — Easy · Math
• Restock Alert — Easy · Arrays, Implementation
• Digital Root — Easy · Math
• Count Negatives — Easy · Arrays
• Even Numbers Up To N — Easy · Implementation, Math
• Repeat String — Easy · Strings
• Array Range — Easy · Arrays
• Sum of Even Elements — Easy · Arrays, Math
• Reverse the Words — Easy · Strings
• Count Divisors — Easy · Number Theory, Math
• Running Maximum — Easy · Arrays
• Hex to Decimal — Easy · Math, Implementation
• Sum of Squares — Easy · Math
• Count Odd Numbers — Easy · Arrays
• Minimum and Maximum — Easy · Arrays
• Alternating Sum — Easy · Arrays, Math
• Prefix Sums — Easy · Prefix Sum, Arrays
• Count Above Average — Easy · Arrays, Math
• Capitalize Words — Easy · Strings
• Trailing Zero Bits — Easy · Bit Manipulation, Math
• Swap Case — Easy · Strings
• Add Two Arrays — Easy · Arrays
• Sum of Cubes — Easy · Math
• Count Positive Numbers — Easy · Arrays
• Floor of Average — Easy · Arrays, Math
• Second Smallest — Easy · Arrays
• Palindrome Number — Easy · Math
• Count Digits — Easy · Math
• Interleave Arrays — Easy · Arrays
• Remove Spaces — Easy · Strings
• Max Consecutive Ones — Easy · Arrays
• Absolute Values — Easy · Arrays
• XP to Level — Easy · Math
• Typing Speed — Easy · Math
• Traffic Light — Easy · Simulation, Math
• Seconds to Midnight — Easy · Math
• Dropped Frames — Easy · Arrays
• Health Bar — Easy · Arrays, Simulation
• Tournament Byes — Easy · Math
• Keystroke Count — Easy · Strings, Math
• Snake Length — Easy · Strings, Simulation
• First Free Spot — Easy · Strings, Arrays

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