MathForces: Math Olympiads
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Name сортировать Difficulty сортировать Users
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Cyclic Q 600 15 Geometry
Lin's Octagon 300 44 Combinatorics
Nice Integer 400 5 Number-Theory, Algebra, Polynomials
Test 100 777
2020 digit 200 475 Algebra, Digits
Weird equation 200 192 Algebra, Polynomials
Oh-matrix 300 138 Algebra, Linear-Algebra, Matrices
Daniyar's Friends 300 28
Interesting permutations 600 3 Number-Theory
Special square 500 54 Number-Theory, Squares
Cubical squares 100 594 Algebra, Exponents
Product of differences 300 111 Algebra, Inequalities
Viet said 500 100 Number-Theory
Sum of four 100 387 Combinatorics, Digits
2020 Palindromes 100 354 Combinatorics, Palindromes
Positive product of sums 300 66 Algebra, Equations, Number-Theory
Odd divisors 300 83 Number-Theory, Divisors
Convex triangle 400 38 Geometry, Combinatorics
Relatively prime with 2020 200 221 Number-Theory, Prime-Numbers
Weird games 500 20 Combinatorics
Powers of 6 500 38 Number-theory, Equations
C Sum 300 110 Algebra, Combinatorics, Formulas
Squared fours 200 186 Number-Theory, Algebra
Lin's Numbers 400 30 Number-Theory, Algebra
Divisibility by 4 200 214 Number-Theory, Digits
Similar polynomials 500 48 Algebra, Polynomials
Monochromatics 400 5 Combinatorics, Graphs
Polynomial without 4 400 43 Algebra, Polynomials
Air MF 500 6 Combinatorics
Tricky sequence 500 29 Number-Theory, Algebra, Sequences
All such 400 65 Number-Theory, Equations
Triangle in hyperbola 400 63 Algebra, Geometry, Coordinates
x[x] 400 52 Number-Theory, Floor-Function
Many digits 400 101 Algebra
335577 500 33 Number-Theory, Powers
Teleporting button 300 14 Combinatorics, Probabilities
First geometry 400 60 Geometry, Circles, Tangents
Parking 300 184 Combinatorics
Functional Eq 700 16 Algebra, Functional-Equations
Ordered papers 300 33 Combinatorics
MathForces Store 500 32 Combinatorics
Permutational Polynomial 500 31 Algebra
Angle chasing 300 127 Geometry, Angle-Chasing
Progressive sequence 500 18 Algebra, Number-Theory, Sequences
Bingo! 200 148 Combinatorics, Probabilities
What a function 400 38 Algebra, Functions
Lin the Racoon's Debut 600 16 Combinatorics, Raccoon
Tricky polynomial 600 45 Algebra, Polynomials, Complex-Numbers
Also palindrome 400 44 Digits
Odd factors 500 27
One three-digit number 200 251 Algebra, Inequalities
Almost squared numbers 300 44 Number-Theory
Zeros and Ones 300 21 Combinatorics
Integer sequence 400 11 Algebra, Sequences
Just sequence 300 146 Algebra, Sequences
Exactly two roots 400 50 Number-Theory, Equations
Prime powers 400 37
Regular Polygons 200 50 Geometry, Combinatorics
Number Coloring 400 21 Combinatorics
Friendly rooks 200 156 Combinatorics, Chess
Tricky 400 60 Number-Theory
Simple expression 300 79 Algebra, Combinatorics
Sqaure in square 600 37 Geometry, Squares
Orthocenter 600 12 Geometry, Circles, Tangents
Zero sequence 200 67 Algebra, Sequences
Diameter 400 51 Geometry, Perpendiculars
Numbers ratio 100 582 Algebra, Arithmetics
Arithmetic derivative 500 42 Number-Theory, Functions
Tommorow's day 100 631 Algebra, Digits
Independence 300 10 Combinatorics, Probabilities
Revolution 300 20 Combinatorics
NRD pair 200 93 Number-Theory, Prime-Numbers
U turn 200 145 Algebra, Number-Theory, Digits
Concetric 200 63 Geometry
Switchers 400 44 Combinatorics, Sets
Function 300 192 Algebra, Functional-Equations
MTMTK System 400 20 Algebra, Equations
Sequenta 300 65 Algebra, Sequences
Square multiples of 24 200 224
VNT 500 97 Number-Theory, LTE
Not your business 200 184 Geometry, Tangents
More dominos 400 31 Combinatorics
Concatenate 500 15 Number-Theory
Fractions 300 109 Algebra
Equilateral Triangles 200 210 Combinatorics, Grids
Tan-Sin 500 38 Geometry, Trigonometry
Semiperimeter 200 42 Geometry
Reverse Product 400 36 Combinatorics, Number-Theory
Pencils 400 7 Combinatorics
Love Triangle 400 6 Combinatorics
Gineq 300 48 Geometry
2+1 200 242 Algebra, Arithmetics
Cool-divisble numbers 300 64 Number-Theory, Digits
Difference of squares 200 43 Combinatorics, Number-Theory
Sum of Digits 200 67 Number-Theory, Digits
Rational Irrational 300 31 Algebra, Number-Theory
Powered Numbers (Duplicate) 300 49 Algebra, Number-Theory
Flights 500 9 Combinatorics, Graphs
!Fancy polygon 400 38 Geometry, 3D
Digital Cubes 100 84 Algebra, Digits
Simple sum 300 26 Algebra, Sums
Soccer Game 500 11 Combinatorics
Max Area 300 37 Geometry
Half Integers 500 2 Combinatorics, Geometry
Expanding brackets 300 146 Algebra, Polynomials
ADAD (Duplicate) 400 40 Geometry, Circles
Probability computer 300 29 Combinatorics
Hold me 500 18 Algebra
Minimizing Fibb 400 120 Algebra, Sequences
Uneven numbers 100 107 Number-Theory
Four equal angles 200 64 Geometry
Small triangular numbers 200 132 Algebra, Number-Theory
New FE 300 48 Functional-Equations
New Cake 400 26 Geometry
Subsets Collection 600 25 Combinatorics, Sets
Sequence 300 43 Number-Theory
Simple Altai 400 18 Number-Theory
Mathrix 600 4 Algebra, Number-Theory, Matrices
Smallest fraction 300 21 Algebra, Number-Theory
Sum of Squares 500 24 Geometry
Cuboid 300 26 Number-Theory
Random numbers 400 16 Algebra, Combinatorics
Sum of digits 2020 200 149 Number-Theory, Digits
Divisible sets 300 6 Combinatorics
Area of triangle 200 197 Geometry, Squares, Areas
Four on a circle 400 43 Geometry, Circles
Lin Jumper 500 15 Combinatorics
Cemicirlces 300 16 Geometry, Areas
Excirlce 400 3 Geometry
Base4 300 30 Number-Theory
Rational Polynomial 400 25 Algebra, Polynomials
Polynomial Probability 600 26
Powered Numbers 300 50 Algebra, Number-Theory
Random answer 100 444 Random
Novirus 300 81 Combinatorics, Graphs
Irreducible Fractions 200 75 Number-Theory
Point O 400 98 Geometry
0,1,2 polynomial 400 20 Combinatorics, Algebra
Odd polynomial 400 103 Algebra, Polynomials
Hexagonial 300 10 Geometry, Hexagons
Obtuser 400 18 Combinatorics, Geometry
Flip 200 64 Algebra, Number-Theory, Digits
Temirlan's cake 100 716 Algebra, Arithmetics
Smallest degree 400 8 Algebra, Polynomials
!Fancy FE 500 9 Algebra, Polynomials
Smallest number 600 242 Algebra
Sum probability 300 77 Combinatorics, Algebra, Probablilities
Fill the square 400 16 Combinatorics, Algebra
School Clubs 500 3 Combinatorics
Rooks 600 15 Combinatorics
!Fancy cubic 300 65 Algebra, Number-Theory
Lin does shopping 200 26 Algebra, Number-Theory
Seven eleven 200 56 Algebra
Just Easy Sum 100 131 Algebra
Triangle in Hexagon 200 52 Geometry, Probabilities
Not fibbo 300 53 Algebra, Sequences
ADAD 400 37 Geometry, Circles
Again these rooks 600 57 Combinatorics, Boards
Binary Sum 500 25 Number-Theory, Algebra
6-sums 100 107 Algebra
5 instead of 1 200 178
Fancy limit 400 31 Algebra, Sequences
Math lesson 400 40 Number-Theory, Combinatorics
Bools and cows 200 157 Random, Combinatorics
Maximum of Minimum 500 26 Algebra, Inequalities
Cube Cube Square 300 26 Algebra, Number-Theory
Factorial Factor 200 59 Number-Theory, Combinatorics
Sharp inequality 500 10 Algebra, Inequalities
Lucky numbers 100 141 Digits, Algebra
Unordered triplet 300 45 Algebra, Number-Theory
Five Primes 100 125 Number-Theory
Sharingan 500 10 Geometry
Big set 400 15 Combinatorics
Administrative function 900 9
Not constant 300 25 Algebra, Number-Theory
These Triangles 300 17 Geometry, Combinatorics
Fancy polynomial 800 20 Algebra, Polynomials
Triangle and Square 200 60 Geometry
Quadratic 300 46 Algebra, Number-Theory
Product of areas 300 40 Geometry
Quadratic Sets 400 7 Combinatorics, Sets, Algebra
Negative roots 300 30 Algebra
Poly 600 10 Algebra
Interesting functions 600 12 Number-Theory
Circled 700 12 Geometry, Combinatorics
Pentagon 500 17 Geometry, Combinatorics, Pentagons
Magic Ruler 500 6 Geometry, Combinatorics
Small triangle 600 13 Geometry, Areas
Solutions on the interval 300 55 Algebra, Equations
Friendly Team 400 11 Combinatorics
Almost fixed 400 13 Combinatorics, Algebra
Fancy point 500 11 Geometry
Fancy integral 700 32 Algebra, Sums, Integrals
Prime Sets 500 8 Combinatorics, Number-Theory
Chords 300 10 Geometry, Circles
5th power equation 500 62 Algebra, Equations
Half of Octahedron 400 123 Combinatorics, Graphs
Cyclic Areas 300 26 Geometry, Areas
Nice polynomial 700 7 Algebra
Fancy meal 300 74
Discriminant 400 33 Algebra, Polynomials
Infinite game 500 40 Combinatorics, Games
!Fancy grid 700 9 Combinatorics, Graphs
Rotating Hexagon 600 2 Geometry, Combinatorics
Too much 600 26 Algebra, Equations
!Fancy sequence 600 8 Combinatorics, Number-Theory
Checkboard 600 3 Combinatorics
Good Order 600 3 Algebra, Number-Theory
Where is my husband 500 23 Combinatorics, True-False
6 Apart 500 86 Geometry, 3D
Unfair Game 400 31 Combinatorics
D Flags 200 72 Web-Search
Equiangular Hexagon 400 11
Money date 100 304 Combinatorics, Probabilities
Inverse Sum in Triangle 500 10 Geometry
Friends Playing 600 17 Combinatorics
Lin's Game 400 9 Combinatorics, Games
Total inversion 500 31 Combinatorics, Geometry