MathForces: Math Olympiads
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Name сортировать Difficulty сортировать Users
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Cemicirlces 300 21 Geometry, Areas
Test 100 852
Oh-matrix 300 149 Algebra, Linear-Algebra, Matrices
2020 digit 200 507 Algebra, Digits
Probability computer 300 36 Combinatorics
Sum of four 100 417 Combinatorics, Digits
Viet said 500 106 Number-Theory
Love Triangle 400 6 Combinatorics
Prime Sets 500 8 Combinatorics, Number-Theory
Special square 500 54 Number-Theory, Squares
Product of differences 300 123 Algebra, Inequalities
Excirlce 400 3 Geometry
Simple sum 300 30 Algebra, Sums
C Sum 300 118 Algebra, Combinatorics, Formulas
Relatively prime with 2020 200 234 Number-Theory, Prime-Numbers
Lin the Racoon's Debut 600 18 Combinatorics, Raccoon
Squared fours 200 202 Number-Theory, Algebra
Convex triangle 400 39 Geometry, Combinatorics
Odd divisors 300 88 Number-Theory, Divisors
Positive product of sums 300 72 Algebra, Equations, Number-Theory
Powers of 6 500 39 Number-theory, Equations
Cyclic Q 600 16 Geometry
Similar polynomials 500 52 Algebra, Polynomials
Divisibility by 4 200 229 Number-Theory, Digits
All such 400 68 Number-Theory, Equations
Polynomial without 4 400 43 Algebra, Polynomials
Tricky sequence 500 30 Number-Theory, Algebra, Sequences
P1 300 0
Triangle in hyperbola 400 63 Algebra, Geometry, Coordinates
x[x] 400 57 Number-Theory, Floor-Function
First geometry 400 61 Geometry, Circles, Tangents
Binary polindromes 300 6
D Flags 200 74 Web-Search
335577 500 34 Number-Theory, Powers
Many digits 400 108 Algebra
Again these rooks 600 58 Combinatorics, Boards
2020 Palindromes 100 377 Combinatorics, Palindromes
Angle chasing 300 135 Geometry, Angle-Chasing
Progressive sequence 500 18 Algebra, Number-Theory, Sequences
Naruto cubed 300 0
Negative roots 300 35 Algebra
Checkboard 600 3 Combinatorics
Right Square 300 0
What a function 400 38 Algebra, Functions
Tricky polynomial 600 47 Algebra, Polynomials, Complex-Numbers
Seven eleven 200 64 Algebra
Pencils 400 7 Combinatorics
Good Order 600 3 Algebra, Number-Theory
Odd factors 500 27
Just sequence 300 148 Algebra, Sequences
One three-digit number 200 260 Algebra, Inequalities
Cubical squares 100 630 Algebra, Exponents
Almost squared numbers 300 48 Number-Theory
P5 300 0
Bingo! 200 157 Combinatorics, Probabilities
Exactly two roots 400 50 Number-Theory, Equations
Prime powers 400 37
School Clubs 500 3 Combinatorics
Big set 400 15 Combinatorics
Friendly rooks 200 163 Combinatorics, Chess
Sqaure in square 600 39 Geometry, Squares
Fancy limit 400 31 Algebra, Sequences
Orthocenter 600 12 Geometry, Circles, Tangents
Money date 100 325 Combinatorics, Probabilities
Air MF 500 6 Combinatorics
Zero sequence 200 71 Algebra, Sequences
Ordered papers 300 34 Combinatorics
Arithmetic derivative 500 42 Number-Theory, Functions
NRD pair 200 96 Number-Theory, Prime-Numbers
Tricky 400 61 Number-Theory
Concetric 200 66 Geometry
Fancy integral 700 32 Algebra, Sums, Integrals
Switchers 400 44 Combinatorics, Sets
Fancy meal 300 76
Fancy point 500 11 Geometry
Friendly Team 400 12 Combinatorics
MTMTK System 400 21 Algebra, Equations
Simple expression 300 83 Algebra, Combinatorics
Square multiples of 24 200 231
More dominos 400 31 Combinatorics
VNT 500 97 Number-Theory, LTE
Equilateral Triangles 200 213 Combinatorics, Grids
Total inversion 500 31 Combinatorics, Geometry
Triangle in Hexagon 200 58 Geometry, Probabilities
Integer sequence 400 13 Algebra, Sequences
U turn 200 148 Algebra, Number-Theory, Digits
Zeros and Ones 300 25 Combinatorics
2+1 200 251 Algebra, Arithmetics
Cool-divisble numbers 300 68 Number-Theory, Digits
Digital Cubes 100 91 Algebra, Digits
Rational Irrational 300 33 Algebra, Number-Theory
Gineq 300 51 Geometry
Teleporting button 300 18 Combinatorics, Probabilities
Fractions 300 114 Algebra
Powered Numbers (Duplicate) 300 51 Algebra, Number-Theory
Bools and cows 200 164 Random, Combinatorics
Tommorow's day 100 659 Algebra, Digits
Numbers ratio 100 602 Algebra, Arithmetics
Semiperimeter 200 42 Geometry
Max Area 300 39 Geometry
Sum of Digits 200 73 Number-Theory, Digits
Functional Eq 700 16 Algebra, Functional-Equations
ADAD (Duplicate) 400 40 Geometry, Circles
Difference of squares 200 51 Combinatorics, Number-Theory
Fancy polynomial 800 20 Algebra, Polynomials
Four equal angles 200 74 Geometry
Expanding brackets 300 146 Algebra, Polynomials
Regular Polygons 200 53 Geometry, Combinatorics
New Cake 400 26 Geometry
Lin's Game 400 9 Combinatorics, Games
Sequenta 300 67 Algebra, Sequences
Uneven numbers 100 138 Number-Theory
Not your business 200 190 Geometry, Tangents
Sum of Squares 500 24 Geometry
!Fancy grid 700 9 Combinatorics, Graphs
!Fancy polygon 400 38 Geometry, 3D
Simple Altai 400 19 Number-Theory
Subsets Collection 600 27 Combinatorics, Sets
Diameter 400 54 Geometry, Perpendiculars
Flights 500 9 Combinatorics, Graphs
Hold me 500 20 Algebra
Smallest fraction 300 27 Algebra, Number-Theory
Mathrix 600 5 Algebra, Number-Theory, Matrices
Small triangular numbers 200 134 Algebra, Number-Theory
Four on a circle 400 43 Geometry, Circles
Area of triangle 200 203 Geometry, Squares, Areas
Powered Numbers 300 51 Algebra, Number-Theory
Also palindrome 400 46 Digits
Base4 300 33 Number-Theory
Half of Octahedron 400 123 Combinatorics, Graphs
Rational Polynomial 400 25 Algebra, Polynomials
Weird games 500 20 Combinatorics
Divisible sets 300 6 Combinatorics
Random numbers 400 17 Algebra, Combinatorics
Point O 400 98 Geometry
Random answer 100 465 Random
These Triangles 300 21 Geometry, Combinatorics
0,1,2 polynomial 400 20 Combinatorics, Algebra
Irreducible Fractions 200 84 Number-Theory
Unfair Game 400 31 Combinatorics
Small triangle 600 15 Geometry, Areas
Polynomial Probability 600 27
Interesting functions 600 12 Number-Theory
Smallest degree 400 10 Algebra, Polynomials
Fill the square 400 16 Combinatorics, Algebra
Number Coloring 400 22 Combinatorics
Sum probability 300 82 Combinatorics, Algebra, Probablilities
Solutions on the interval 300 58 Algebra, Equations
!Fancy cubic 300 67 Algebra, Number-Theory
Temirlan's cake 100 748 Algebra, Arithmetics
Lin's Numbers 400 31 Number-Theory, Algebra
Just Easy Sum 100 150 Algebra
Not fibbo 300 55 Algebra, Sequences
Sum of digits 2020 200 152 Number-Theory, Digits
Weird equation 200 195 Algebra, Polynomials
Binary Sum 500 26 Number-Theory, Algebra
6-sums 100 120 Algebra
Revolution 300 22 Combinatorics
Concatenate 500 15 Number-Theory
Cube Cube Square 300 28 Algebra, Number-Theory
MathForces Store 500 32 Combinatorics
Math lesson 400 40 Number-Theory, Combinatorics
Hexagonial 300 14 Geometry, Hexagons
ADAD 400 37 Geometry, Circles
Function 300 196 Algebra, Functional-Equations
Parking 300 188 Combinatorics
Five Primes 100 141 Number-Theory
Soccer Game 500 11 Combinatorics
Factorial Factor 200 63 Number-Theory, Combinatorics
Reverse Product 400 36 Combinatorics, Number-Theory
Odd polynomial 400 103 Algebra, Polynomials
Lucky numbers 100 153 Digits, Algebra
Sequence 300 46 Number-Theory
Not constant 300 27 Algebra, Number-Theory
Cyclic Areas 300 28 Geometry, Areas
Sharp inequality 500 10 Algebra, Inequalities
Sharingan 500 11 Geometry
5 instead of 1 200 182
Triangle and Square 200 65 Geometry
Independence 300 10 Combinatorics, Probabilities
Quadratic 300 49 Algebra, Number-Theory
Rooks 600 16 Combinatorics
Smallest number 600 244 Algebra
Maximum of Minimum 500 27 Algebra, Inequalities
Obtuser 400 19 Combinatorics, Geometry
New FE 300 50 Functional-Equations
Minimizing Fibb 400 121 Algebra, Sequences
Cuboid 300 27 Number-Theory
Inverse Sum in Triangle 500 10 Geometry
Pentagon 500 17 Geometry, Combinatorics, Pentagons
Poly 600 10 Algebra
Half Integers 500 2 Combinatorics, Geometry
Unordered triplet 300 51 Algebra, Number-Theory
Nice Integer 400 5 Number-Theory, Algebra, Polynomials
!Fancy FE 500 9 Algebra, Polynomials
Chords 300 12 Geometry, Circles
Infinite game 500 41 Combinatorics, Games
Flip 200 64 Algebra, Number-Theory, Digits
Friends Playing 600 18 Combinatorics
Permutational Polynomial 500 32 Algebra
!Fancy sequence 600 8 Combinatorics, Number-Theory
Daniyar's Friends 300 28
Novirus 300 81 Combinatorics, Graphs
Lin does shopping 200 29 Algebra, Number-Theory
Too much 600 27 Algebra, Equations
Discriminant 400 34 Algebra, Polynomials
Monochromatics 400 6 Combinatorics, Graphs
Lin's Octagon 300 45 Combinatorics
Almost fixed 400 13 Combinatorics, Algebra
Lin Jumper 500 15 Combinatorics
Rotating Hexagon 600 3 Geometry, Combinatorics
5th power equation 500 63 Algebra, Equations
Administrative function 900 9
Nice polynomial 700 7 Algebra
Product of areas 300 42 Geometry
Quadratic Sets 400 8 Combinatorics, Sets, Algebra
6 Apart 500 88 Geometry, 3D
Tan-Sin 500 39 Geometry, Trigonometry
Circled 700 13 Geometry, Combinatorics
Where is my husband 500 23 Combinatorics, True-False
Equiangular Hexagon 400 11
Magic Ruler 500 7 Geometry, Combinatorics
Interesting permutations 600 6 Number-Theory