User admin

About
Problems

Points breakdown

10 / 10

AC | Python 3

Key Lookup

on July 16, 2026, 7:10 p.m.

10pp

weighted 100% (10pp)

10 / 10

AC | Python 3

Word Frequency

on July 16, 2026, 7:09 p.m.

10pp

weighted 95% (9.5pp)

8 / 8

AC | Python 3

Sum of Two Integers

on July 16, 2026, 4:15 a.m.

10pp

weighted 90% (9.0pp)

10 / 10

AC | Python 3

Solid Rectangle

on July 15, 2026, 3:53 p.m.

10pp

weighted 86% (8.6pp)

5 / 5

AC | Python 3

Sum of Two Integers

on July 15, 2026, 3:42 p.m.

5pp

weighted 81% (4.1pp)

User admin

Points breakdown

Authored problems (261)

Basic Programming (15 points)

Loop Patterns (10 points)

Python Dictionary Practice (20 points)

Problem	Category	Points
Even or Odd	Basic Programming	5
Word Frequency	Python Dictionary Practice	10
Key Lookup	Python Dictionary Practice	10
Most Frequent Number	Python Dictionary Practice	10
Equal Pairs	Python Dictionary Practice	10
Frequency in Arrival Order	Python Dictionary Practice	10
Sum of Values	Python Dictionary Practice	10
Key with Maximum Value	Python Dictionary Practice	10
Merge Inventories	Python Dictionary Practice	10
Top Three Characters	Python Dictionary Practice	10
Anagram Check	Python Dictionary Practice	10
Top Five Words	Python Dictionary Practice	10
Alphanumeric Frequency	Python Dictionary Practice	10
Distinct Messages	Python Dictionary Practice	10
Pattern Positions	Python Dictionary Practice	10
Rotated Necklaces	Python Dictionary Practice	10
Unique Numbers	Python Dictionary Practice	10
Username Registry	Python Dictionary Practice	10
Target Sum Pairs	Python Dictionary Practice	10
Matching Difference Pairs	Python Dictionary Practice	10
Longest Distinct Segment	Python Dictionary Practice	10
Live Scoreboard	Python Dictionary Practice	10
Sparse Dot Product	Python Dictionary Practice	10
Edge List to Adjacency Lists	Graph Theory	100
Adjacency Lists to an Edge List	Graph Theory	100
Directed Edge List to Adjacency Lists	Graph Theory	100
Edge List to an Adjacency Matrix	Graph Theory	100
Adjacency Matrix to an Edge List	Graph Theory	100
Adjacency Matrix to Adjacency Lists	Graph Theory	100
Adjacency Lists to an Adjacency Matrix	Graph Theory	100
Weighted Matrix to an Edge List	Graph Theory	100
Depth-First Search of an Undirected Graph	Graph Theory	100
Depth-First Search of a Directed Graph	Graph Theory	100
Breadth-First Search of an Undirected Graph	Graph Theory	100
Breadth-First Search of a Directed Graph	Graph Theory	100
Count Connected Components	Graph Theory	100
A DFS Path in an Undirected Graph	Graph Theory	100
A Shortest Path in an Undirected Graph	Graph Theory	100
A DFS Path in a Directed Graph	Graph Theory	100
A Shortest Path in a Directed Graph	Graph Theory	100
Reachability Queries	Graph Theory	100
Count Articulation Points	Graph Theory	100
Count Bridges	Graph Theory	100
Cycle in an Undirected Graph	Graph Theory	100
Cycle in a Directed Graph	Graph Theory	100
Strong Connectivity	Graph Theory	100
Is It a Tree?	Graph Theory	100
Breadth-First Traversal	Graph Theory	100
Shortest Number of Roads	Graph Theory	100
Counting Rooms	Graph Theory	100
Build Roads	Graph Theory	100
Largest Friend Group	Graph Theory	100
Choose Group Leaders	Graph Theory	100
Shortest Path in a Maze	Graph Theory	100
Knight Path on a Blocked Board	Graph Theory	100
Connect Ropes with Minimum Cost	Graph Theory	100
Minimum String Value	Graph Theory	100
Print a Historical Sentence	Programming Basics	100
Square Root	Programming Basics	100
Basic Arithmetic Operators	Programming Basics	100
Evaluate a Quartic Polynomial	Programming Basics	100
Weighted Course Average	Programming Basics	100
Swap Two Integers	Programming Basics	100
Evaluate a Quadratic Polynomial	Programming Basics	100
Rectangle Perimeter and Area	Programming Basics	100
Evaluate a Radical Fraction	Programming Basics	100
Floor of a Number	Programming Basics	100
Evaluate an Exponential Fraction	Programming Basics	100
A Piecewise Expression	Programming Basics	100
Hello World Output	Programming Basics	100
Formatted Values	Programming Basics	100
Three Integer Expressions	Programming Basics	100
Integer Power	Programming Basics	100
Square and Cube Roots	Programming Basics	100
Perfect Square Check	Programming Basics	100
First K Perfect Squares	Programming Basics	100
Prime Check	Programming Basics	100
First K Primes	Programming Basics	100
Stirling Numbers of the Second Kind	Programming Basics	100
Number of Divisors	Programming Basics	100
Prime Elements	Programming Basics	100
Array Sum and Parity	Programming Basics	100
Even and Odd Statistics	Programming Basics	100
Count Primes and Perfect Squares	Programming Basics	100
Digit Sums in an Array	Programming Basics	100
Sum and Average of Even Elements	Programming Basics	100
Monotonic Array	Programming Basics	100
Perfect Numbers in an Array	Programming Basics	100
Frequencies in Sorted Order	Programming Basics	100
First Occurrence	Programming Basics	100
Frequencies by First Appearance	Programming Basics	100
Candidate Salary Report	Programming Basics	100
Farthest Pair of Points	Programming Basics	100
Stable Sort by Digit Sum	Programming Basics	100
Sort by Absolute Value	Programming Basics	100
Sort Student Records	Programming Basics	100
Distinct Array Values	Programming Basics	100
Integers from 2N to 3N	Programming Basics	100
Sum of Three-Consecutive Products	Programming Basics	100
Multiples of Three in an Interval	Programming Basics	100
Nested Square Roots	Programming Basics	100
Largest Triangular Sum Below N	Programming Basics	100
Euler Totient Function	Programming Basics	100
K-th Prime Factor	Programming Basics	100
Prime Digits	Programming Basics	100
Solid Rectangle	Loop Patterns	10
Solid Square	Loop Patterns	10
Left Star Triangle	Loop Patterns	10
Inverted Star Triangle	Loop Patterns	10
Right Star Triangle	Loop Patterns	10
Hollow Rectangle	Loop Patterns	10
Hollow Square	Loop Patterns	10
Star Pyramid	Loop Patterns	10
Inverted Star Pyramid	Loop Patterns	10
Solid Diamond	Loop Patterns	10
Increasing Number Triangle	Loop Patterns	10
Repeated Row Number Triangle	Loop Patterns	10
Reverse Number Triangle	Loop Patterns	10
Floyd Triangle	Loop Patterns	10
Binary Border Square	Loop Patterns	10
Star Letter X	Loop Patterns	10
Plus Sign	Loop Patterns	10
Checkerboard	Loop Patterns	10
Row Zigzag Matrix	Loop Patterns	10
Clockwise Spiral Matrix	Loop Patterns	10
Solid Hourglass	Loop Patterns	10
Hollow Pyramid	Loop Patterns	10
Hollow Diamond	Loop Patterns	10
Frame With Diagonals	Loop Patterns	10
Star Letter A	Loop Patterns	10
Star Letter H	Loop Patterns	10
Star Letter Z	Loop Patterns	10
Symmetric Number Pyramid	Loop Patterns	10
Pascal Triangle	Loop Patterns	10
Distance To Border Matrix	Loop Patterns	10
Diagonal Sum Matrix	Loop Patterns	10
Column Zigzag Matrix	Loop Patterns	10
Downward Spiral Matrix	Loop Patterns	10
Block Checkerboard	Loop Patterns	10
Approximate Circle	Loop Patterns	10
Star Letter N	Loop Patterns	10
Centered Pascal Triangle	Loop Patterns	10
Letter Spiral Matrix	Loop Patterns	10
Star Heart	Loop Patterns	10
Layered Frame	Loop Patterns	10
Maximum of Three Integers	Basic Programming	10
Big Integer Addition	Number Theory and Combinatorics	100
Multiple Big Integer Additions	Number Theory and Combinatorics	100
Cell Division	Number Theory and Combinatorics	100
Fibonacci Queries	Number Theory and Combinatorics	100
Large Fibonacci Queries	Number Theory and Combinatorics	100
Primes below n	Number Theory and Combinatorics	100
Primality Queries	Number Theory and Combinatorics	100
Prime Factorization	Number Theory and Combinatorics	100
Number of Divisors	Number Theory and Combinatorics	100
Prime Check	Number Theory and Combinatorics	100
Prime Sieve	Number Theory and Combinatorics	100
Multiple Prime Checks	Number Theory and Combinatorics	100
Prime Numbers with Prime Digits	Number Theory and Combinatorics	100
Goldbach Pairs	Number Theory and Combinatorics	100
Pure Prime Numbers	Number Theory and Combinatorics	100
Coprime Pairs	Number Theory and Combinatorics	100
T-primes	Number Theory and Combinatorics	100
Count T-primes	Number Theory and Combinatorics	100
Divisor Count from a Factorization	Number Theory and Combinatorics	100
Smallest Prime Factors	Number Theory and Combinatorics	100
Factorization with Exponents	Number Theory and Combinatorics	100
Exponent of a Prime in n!	Number Theory and Combinatorics	100
Trailing Zeroes of n!	Number Theory and Combinatorics	100
Sphenic Number	Number Theory and Combinatorics	100
Smith Number	Number Theory and Combinatorics	100
Largest Prime Factor	Number Theory and Combinatorics	100
Divisible by a Prime Square	Number Theory and Combinatorics	100
Powerful Numbers	Number Theory and Combinatorics	100
Repeated Digit Sum	Number Theory and Combinatorics	100
Right-truncatable Primes	Number Theory and Combinatorics	100
Pascal's Triangle	Number Theory and Combinatorics	100
Perfect Square Check	Number Theory and Combinatorics	100
Perfect Squares in a Range	Number Theory and Combinatorics	100
Count Perfect Squares in a Range	Number Theory and Combinatorics	100
Sum of Divisors	Number Theory and Combinatorics	100
Count Divisors	Number Theory and Combinatorics	100
Odd Number of Divisors	Number Theory and Combinatorics	100
Perfect Number	Number Theory and Combinatorics	100
Palindromes with Three Prime Divisors	Number Theory and Combinatorics	100
Lucky Digits	Number Theory and Combinatorics	100
Lucky Palindromes	Number Theory and Combinatorics	100
Primes Whose Last Digit Is Largest	Number Theory and Combinatorics	100
k-th Prime Factor	Number Theory and Combinatorics	100
Euler's Totient Function	Number Theory and Combinatorics	100
Prime Digits	Number Theory and Combinatorics	100
Smallest Common Multiple with n Digits	Number Theory and Combinatorics	100
GCD and LCM	Number Theory and Combinatorics	100
Pascal's Triangle Modulo	Number Theory and Combinatorics	100
Modular Exponentiation	Number Theory and Combinatorics	100
Number of Divisors of n!	Number Theory and Combinatorics	100
Alternating Sum	Number Theory and Combinatorics	100
Last Digit of 1378^N	Number Theory and Combinatorics	100
A Distinct Goldbach Pair	Number Theory and Combinatorics	100
Distinct Values	Marking Arrays and Prefix Sums	100
Frequencies in Sorted Order	Marking Arrays and Prefix Sums	100
Frequencies by First Appearance	Marking Arrays and Prefix Sums	100
Prime-Balanced Indices	Marking Arrays and Prefix Sums	100
Reverse an Array	Marking Arrays and Prefix Sums	100
Fixed-Size Window Sums	Marking Arrays and Prefix Sums	100
Build a Prefix Sum Array	Marking Arrays and Prefix Sums	100
Range Sum Queries	Marking Arrays and Prefix Sums	100
Carrot Harvest	Marking Arrays and Prefix Sums	100
Range Addition	Marking Arrays and Prefix Sums	100
Maximum Total Range Sum	Marking Arrays and Prefix Sums	100
Milk Tea Quality Queries	Marking Arrays and Prefix Sums	100
Repeated Range Operations	Marking Arrays and Prefix Sums	100
Sum from 1 to n	Đệ quy	100
Sum of Squares	Đệ quy	100
Sum of Cubes	Đệ quy	100
Alternating Sum	Đệ quy	100
Factorial	Đệ quy	100
The n-th Fibonacci Number	Đệ quy	100
Binomial Coefficient	Đệ quy	100
Greatest Common Divisor and Least Common Multiple	Đệ quy	100
Modular Exponentiation	Đệ quy	100
Harmonic Sum	Đệ quy	100
Binary Representation	Đệ quy	100
Hexadecimal Representation	Đệ quy	100
Digit Sum	Đệ quy	100
Count Digits	Đệ quy	100
First Digit	Đệ quy	100
Largest and Smallest Digits	Đệ quy	100
Print Digits in Both Directions	Đệ quy	100
Sums of Even and Odd Digits	Đệ quy	100
All Digits Even	Đệ quy	100
Reduce n to 1	Đệ quy	100
Palindrome Array	Đệ quy	100
Print an Array in Both Directions	Đệ quy	100
All Array Elements Even	Đệ quy	100
Strictly Increasing Array	Đệ quy	100
Binary Search in a Descending Array	Đệ quy	100
Tribonacci Sequence	Đệ quy	100
Memoized Fibonacci Queries	Đệ quy	100
Binomial Coefficient Queries	Đệ quy	100
Divide-by-Three Sequence	Đệ quy	100
Divide-by-Four Function	Đệ quy	100
Generate Binary Strings	Đệ quy	100
Count Distinct Integers	Set and Map	100
Frequencies in Increasing Order	Set and Map	100
Frequencies by First Appearance	Set and Map	100
Membership Queries	Set and Map	100
Frequency Queries	Set and Map	100
Unique Elements in Order	Set and Map	100
Element Frequency Count	Set and Map	100
Multiset Updates and Membership	Set and Map	100
Student Record Lookup	Set and Map	100
Character Frequency Extremes	Set and Map	100
Ordered Multiset Queries	Set and Map	100
Union of Two Arrays	Set and Map	100
Intersection in First-Array Order	Set and Map	100
Set Difference	Set and Map	100
Symmetric Difference	Set and Map	100
Distinct Words and Lexicographic Extremes	Set and Map	100
Four Set Operations	Set and Map	100
Sum of Two Integers	Basic Programming	5