MathForces: Math Olympiads
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Name сортировать Difficulty сортировать Users
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Friends Playing 600 18 Combinatorics
Test 100 878
Oh-matrix 300 149 Algebra, Linear-Algebra, Matrices
2020 digit 200 517 Algebra, Digits
Almost fixed 400 13 Combinatorics, Algebra
Pencils 400 7 Combinatorics
Viet said 500 108 Number-Theory
Sum of four 100 433 Combinatorics, Digits
Unfair Game 400 31 Combinatorics
Product of differences 300 125 Algebra, Inequalities
Special square 500 56 Number-Theory, Squares
!Fancy sequence 600 8 Combinatorics, Number-Theory
Positive product of sums 300 74 Algebra, Equations, Number-Theory
Weird equation 200 199 Algebra, Polynomials
C Sum 300 122 Algebra, Combinatorics, Formulas
Relatively prime with 2020 200 239 Number-Theory, Prime-Numbers
Lin the Racoon's Debut 600 18 Combinatorics, Raccoon
Odd divisors 300 91 Number-Theory, Divisors
Convex triangle 400 39 Geometry, Combinatorics
Squared fours 200 206 Number-Theory, Algebra
Powers of 6 500 40 Number-theory, Equations
Simple sum 300 30 Algebra, Sums
Similar polynomials 500 53 Algebra, Polynomials
These Triangles 300 21 Geometry, Combinatorics
All such 400 68 Number-Theory, Equations
Polynomial without 4 400 43 Algebra, Polynomials
Tricky sequence 500 30 Number-Theory, Algebra, Sequences
Divisibility by 4 200 231 Number-Theory, Digits
P1 300 0
Triangle in hyperbola 400 63 Algebra, Geometry, Coordinates
Rotating Hexagon 600 3 Geometry, Combinatorics
Small triangle 600 15 Geometry, Areas
First geometry 400 61 Geometry, Circles, Tangents
Binary polindromes 300 6
x[x] 400 58 Number-Theory, Floor-Function
Many digits 400 110 Algebra
335577 500 35 Number-Theory, Powers
2020 Palindromes 100 390 Combinatorics, Palindromes
Fancy polynomial 800 20 Algebra, Polynomials
Administrative function 900 9
Progressive sequence 500 18 Algebra, Number-Theory, Sequences
Naruto cubed 300 0
Weird games 500 20 Combinatorics
Angle chasing 300 135 Geometry, Angle-Chasing
Air MF 500 6 Combinatorics
Right Square 300 0
What a function 400 38 Algebra, Functions
Tricky polynomial 600 47 Algebra, Polynomials, Complex-Numbers
Negative roots 300 36 Algebra
Odd factors 500 27
Lin's Octagon 300 45 Combinatorics
Good Order 600 3 Algebra, Number-Theory
Almost squared numbers 300 49 Number-Theory
Cubical squares 100 637 Algebra, Exponents
Bingo! 200 159 Combinatorics, Probabilities
Just sequence 300 151 Algebra, Sequences
Nice polynomial 700 7 Algebra
P5 300 0
Exactly two roots 400 50 Number-Theory, Equations
Friendly rooks 200 166 Combinatorics, Chess
Lin's Numbers 400 32 Number-Theory, Algebra
Prime powers 400 38
Monochromatics 400 6 Combinatorics, Graphs
Probability computer 300 36 Combinatorics
Sqaure in square 600 39 Geometry, Squares
Orthocenter 600 12 Geometry, Circles, Tangents
Solutions on the interval 300 60 Algebra, Equations
Zero sequence 200 73 Algebra, Sequences
Parking 300 188 Combinatorics
Arithmetic derivative 500 42 Number-Theory, Functions
Excirlce 400 3 Geometry
Reverse Product 400 36 Combinatorics, Number-Theory
Tricky 400 61 Number-Theory
NRD pair 200 97 Number-Theory, Prime-Numbers
Switchers 400 44 Combinatorics, Sets
School Clubs 500 3 Combinatorics
Half of Octahedron 400 123 Combinatorics, Graphs
Concetric 200 67 Geometry
MTMTK System 400 21 Algebra, Equations
One three-digit number 200 264 Algebra, Inequalities
Simple expression 300 84 Algebra, Combinatorics
Square multiples of 24 200 232
Fancy limit 400 31 Algebra, Sequences
VNT 500 97 Number-Theory, LTE
More dominos 400 31 Combinatorics
Cyclic Areas 300 28 Geometry, Areas
Again these rooks 600 58 Combinatorics, Boards
!Fancy grid 700 9 Combinatorics, Graphs
Equilateral Triangles 200 217 Combinatorics, Grids
Checkboard 600 3 Combinatorics
Sharp inequality 500 10 Algebra, Inequalities
Number Coloring 400 22 Combinatorics
Fancy point 500 11 Geometry
Fractions 300 117 Algebra
Numbers ratio 100 610 Algebra, Arithmetics
Tommorow's day 100 667 Algebra, Digits
Rational Irrational 300 34 Algebra, Number-Theory
Powered Numbers (Duplicate) 300 51 Algebra, Number-Theory
2+1 200 259 Algebra, Arithmetics
Teleporting button 300 18 Combinatorics, Probabilities
Semiperimeter 200 42 Geometry
Integer sequence 400 13 Algebra, Sequences
Cool-divisble numbers 300 69 Number-Theory, Digits
Sum of Digits 200 73 Number-Theory, Digits
Zeros and Ones 300 25 Combinatorics
Gineq 300 51 Geometry
Max Area 300 39 Geometry
ADAD (Duplicate) 400 40 Geometry, Circles
Independence 300 10 Combinatorics, Probabilities
Difference of squares 200 51 Combinatorics, Number-Theory
New Cake 400 27 Geometry
Triangle in Hexagon 200 58 Geometry, Probabilities
Digital Cubes 100 95 Algebra, Digits
Expanding brackets 300 148 Algebra, Polynomials
Sequenta 300 69 Algebra, Sequences
Where is my husband 500 23 Combinatorics, True-False
U turn 200 149 Algebra, Number-Theory, Digits
Four equal angles 200 75 Geometry
Daniyar's Friends 300 28
Uneven numbers 100 142 Number-Theory
Sum of Squares 500 24 Geometry
Subsets Collection 600 27 Combinatorics, Sets
Tan-Sin 500 39 Geometry, Trigonometry
Hold me 500 20 Algebra
Not your business 200 190 Geometry, Tangents
Area of triangle 200 205 Geometry, Squares, Areas
Lin does shopping 200 29 Algebra, Number-Theory
Small triangular numbers 200 137 Algebra, Number-Theory
Simple Altai 400 19 Number-Theory
Four on a circle 400 43 Geometry, Circles
Powered Numbers 300 51 Algebra, Number-Theory
Novirus 300 82 Combinatorics, Graphs
Rooks 600 16 Combinatorics
Base4 300 33 Number-Theory
Random numbers 400 17 Algebra, Combinatorics
Functional Eq 700 16 Algebra, Functional-Equations
Rational Polynomial 400 25 Algebra, Polynomials
Point O 400 98 Geometry
Infinite game 500 42 Combinatorics, Games
Random answer 100 471 Random
Irreducible Fractions 200 86 Number-Theory
Divisible sets 300 6 Combinatorics
0,1,2 polynomial 400 20 Combinatorics, Algebra
Half Integers 500 2 Combinatorics, Geometry
Smallest fraction 300 27 Algebra, Number-Theory
MathForces Store 500 32 Combinatorics
Polynomial Probability 600 27
Regular Polygons 200 53 Geometry, Combinatorics
Also palindrome 400 46 Digits
Fill the square 400 16 Combinatorics, Algebra
Sum probability 300 83 Combinatorics, Algebra, Probablilities
Sharingan 500 11 Geometry
!Fancy polygon 400 38 Geometry, 3D
Bools and cows 200 165 Random, Combinatorics
Total inversion 500 31 Combinatorics, Geometry
Just Easy Sum 100 153 Algebra
Interesting functions 600 12 Number-Theory
Seven eleven 200 64 Algebra
Nice Integer 400 5 Number-Theory, Algebra, Polynomials
Concatenate 500 15 Number-Theory
Binary Sum 500 27 Number-Theory, Algebra
6-sums 100 123 Algebra
Temirlan's cake 100 757 Algebra, Arithmetics
Revolution 300 22 Combinatorics
Not fibbo 300 57 Algebra, Sequences
Friendly Team 400 12 Combinatorics
D Flags 200 74 Web-Search
Sum of digits 2020 200 153 Number-Theory, Digits
Smallest degree 400 10 Algebra, Polynomials
Math lesson 400 41 Number-Theory, Combinatorics
ADAD 400 37 Geometry, Circles
Mathrix 600 5 Algebra, Number-Theory, Matrices
Function 300 199 Algebra, Functional-Equations
!Fancy cubic 300 68 Algebra, Number-Theory
Diameter 400 54 Geometry, Perpendiculars
Cube Cube Square 300 28 Algebra, Number-Theory
Five Primes 100 144 Number-Theory
Lin's Game 400 9 Combinatorics, Games
Factorial Factor 200 63 Number-Theory, Combinatorics
Lucky numbers 100 154 Digits, Algebra
Odd polynomial 400 103 Algebra, Polynomials
Soccer Game 500 11 Combinatorics
Not constant 300 28 Algebra, Number-Theory
Hexagonial 300 14 Geometry, Hexagons
Sequence 300 46 Number-Theory
Quadratic Sets 400 9 Combinatorics, Sets, Algebra
Interesting permutations 600 6 Number-Theory
Quadratic 300 49 Algebra, Number-Theory
5 instead of 1 200 183
Love Triangle 400 6 Combinatorics
Triangle and Square 200 66 Geometry
Maximum of Minimum 500 27 Algebra, Inequalities
New FE 300 50 Functional-Equations
Minimizing Fibb 400 121 Algebra, Sequences
Obtuser 400 19 Combinatorics, Geometry
Smallest number 600 244 Algebra
Inverse Sum in Triangle 500 10 Geometry
Pentagon 500 17 Geometry, Combinatorics, Pentagons
Money date 100 333 Combinatorics, Probabilities
Cuboid 300 27 Number-Theory
Poly 600 10 Algebra
Unordered triplet 300 51 Algebra, Number-Theory
Prime Sets 500 8 Combinatorics, Number-Theory
!Fancy FE 500 9 Algebra, Polynomials
Lin Jumper 500 15 Combinatorics
Fancy meal 300 76
Chords 300 12 Geometry, Circles
Flip 200 65 Algebra, Number-Theory, Digits
Circled 700 13 Geometry, Combinatorics
Cyclic Q 600 16 Geometry
Permutational Polynomial 500 33 Algebra
Flights 500 9 Combinatorics, Graphs
Discriminant 400 34 Algebra, Polynomials
Fancy integral 700 32 Algebra, Sums, Integrals
Too much 600 27 Algebra, Equations
5th power equation 500 63 Algebra, Equations
Cemicirlces 300 21 Geometry, Areas
Product of areas 300 42 Geometry
Ordered papers 300 34 Combinatorics
6 Apart 500 88 Geometry, 3D
Big set 400 15 Combinatorics
Magic Ruler 500 7 Geometry, Combinatorics
Equiangular Hexagon 400 11