MathForces: Math Olympiads
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Name сортировать Difficulty сортировать Users
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Total inversion 500 32 Combinatorics, Geometry
Lin's Game 400 9 Combinatorics, Games
Probability computer 300 42 Combinatorics
Simple Altai 400 23 Number-Theory
Test 100 957
Oh-matrix 300 153 Algebra, Linear-Algebra, Matrices
2020 digit 200 550 Algebra, Digits
Cyclic Areas 300 29 Geometry, Areas
Product of differences 300 131 Algebra, Inequalities
Sum of four 100 466 Combinatorics, Digits
Special square 500 56 Number-Theory, Squares
Viet said 500 112 Number-Theory
Lin Jumper 500 15 Combinatorics
Regular Polygons 200 53 Geometry, Combinatorics
Monochromatics 400 7 Combinatorics, Graphs
Positive product of sums 300 77 Algebra, Equations, Number-Theory
Half Integers 500 2 Combinatorics, Geometry
Relatively prime with 2020 200 257 Number-Theory, Prime-Numbers
Lin the Racoon's Debut 600 18 Combinatorics, Raccoon
Odd divisors 300 95 Number-Theory, Divisors
Convex triangle 400 39 Geometry, Combinatorics
C Sum 300 128 Algebra, Combinatorics, Formulas
Powers of 6 500 41 Number-theory, Equations
5th power equation 500 63 Algebra, Equations
Polynomial without 4 400 44 Algebra, Polynomials
Nice Integer 400 5 Number-Theory, Algebra, Polynomials
All such 400 69 Number-Theory, Equations
Divisibility by 4 200 245 Number-Theory, Digits
Tricky sequence 500 30 Number-Theory, Algebra, Sequences
Similar polynomials 500 54 Algebra, Polynomials
P1 300 0
Triangle in hyperbola 400 63 Algebra, Geometry, Coordinates
335577 500 36 Number-Theory, Powers
Many digits 400 112 Algebra
x[x] 400 63 Number-Theory, Floor-Function
Money date 100 351 Combinatorics, Probabilities
First geometry 400 63 Geometry, Circles, Tangents
Excirlce 400 3 Geometry
2020 Palindromes 100 411 Combinatorics, Palindromes
2+1 200 273 Algebra, Arithmetics
Novirus 300 83 Combinatorics, Graphs
Progressive sequence 500 18 Algebra, Number-Theory, Sequences
Naruto cubed 300 0
These Triangles 300 22 Geometry, Combinatorics
!Fancy polygon 400 38 Geometry, 3D
Binary polindromes 300 8
Air MF 500 6 Combinatorics
Good Order 600 3 Algebra, Number-Theory
Daniyar's Friends 300 28
Right Square 300 0
What a function 400 38 Algebra, Functions
Tricky polynomial 600 48 Algebra, Polynomials, Complex-Numbers
Lin's Numbers 400 33 Number-Theory, Algebra
Odd factors 500 27
Almost squared numbers 300 49 Number-Theory
Bingo! 200 165 Combinatorics, Probabilities
Lin does shopping 200 30 Algebra, Number-Theory
Hold me 500 21 Algebra
Just sequence 300 157 Algebra, Sequences
Interesting permutations 600 6 Number-Theory
P5 300 0
Tan-Sin 500 39 Geometry, Trigonometry
Almost fixed 400 14 Combinatorics, Algebra
Friendly rooks 200 174 Combinatorics, Chess
Exactly two roots 400 51 Number-Theory, Equations
Weird games 500 20 Combinatorics
Prime powers 400 38
Sqaure in square 600 39 Geometry, Squares
Ordered papers 300 34 Combinatorics
Orthocenter 600 12 Geometry, Circles, Tangents
Bools and cows 200 173 Random, Combinatorics
Zero sequence 200 77 Algebra, Sequences
Arithmetic derivative 500 43 Number-Theory, Functions
NRD pair 200 100 Number-Theory, Prime-Numbers
Tricky 400 61 Number-Theory
Squared fours 200 213 Number-Theory, Algebra
Switchers 400 44 Combinatorics, Sets
Nice polynomial 700 7 Algebra
Fancy meal 300 76
One three-digit number 200 271 Algebra, Inequalities
MTMTK System 400 21 Algebra, Equations
Prime Sets 500 8 Combinatorics, Number-Theory
Angle chasing 300 136 Geometry, Angle-Chasing
Concetric 200 70 Geometry
More dominos 400 31 Combinatorics
Weird equation 200 211 Algebra, Polynomials
VNT 500 99 Number-Theory, LTE
!Fancy grid 700 9 Combinatorics, Graphs
Friendly Team 400 12 Combinatorics
Fancy point 500 11 Geometry
Permutational Polynomial 500 33 Algebra
Magic Ruler 500 7 Geometry, Combinatorics
Cubical squares 100 663 Algebra, Exponents
Powered Numbers (Duplicate) 300 52 Algebra, Number-Theory
Friends Playing 600 18 Combinatorics
Equilateral Triangles 200 223 Combinatorics, Grids
Concatenate 500 15 Number-Theory
Tommorow's day 100 689 Algebra, Digits
ADAD (Duplicate) 400 40 Geometry, Circles
Circled 700 13 Geometry, Combinatorics
Quadratic Sets 400 9 Combinatorics, Sets, Algebra
Sequenta 300 70 Algebra, Sequences
U turn 200 152 Algebra, Number-Theory, Digits
Max Area 300 40 Geometry
Numbers ratio 100 634 Algebra, Arithmetics
Subsets Collection 600 27 Combinatorics, Sets
Four equal angles 200 81 Geometry
Semiperimeter 200 42 Geometry
New Cake 400 29 Geometry
Sum of Squares 500 24 Geometry
Fractions 300 121 Algebra
Digital Cubes 100 106 Algebra, Digits
Rational Irrational 300 34 Algebra, Number-Theory
Parking 300 191 Combinatorics
Simple expression 300 85 Algebra, Combinatorics
Area of triangle 200 212 Geometry, Squares, Areas
Four on a circle 400 43 Geometry, Circles
Base4 300 33 Number-Theory
Sharp inequality 500 10 Algebra, Inequalities
Powered Numbers 300 51 Algebra, Number-Theory
Small triangular numbers 200 138 Algebra, Number-Theory
Rational Polynomial 400 25 Algebra, Polynomials
Interesting functions 600 12 Number-Theory
Difference of squares 200 58 Combinatorics, Number-Theory
Unfair Game 400 31 Combinatorics
Triangle in Hexagon 200 58 Geometry, Probabilities
Gineq 300 54 Geometry
Flights 500 9 Combinatorics, Graphs
Irreducible Fractions 200 89 Number-Theory
Expanding brackets 300 152 Algebra, Polynomials
Random answer 100 492 Random
Random numbers 400 18 Algebra, Combinatorics
0,1,2 polynomial 400 21 Combinatorics, Algebra
Diameter 400 54 Geometry, Perpendiculars
Square multiples of 24 200 236
Smallest fraction 300 30 Algebra, Number-Theory
Divisible sets 300 6 Combinatorics
Solutions on the interval 300 60 Algebra, Equations
Where is my husband 500 23 Combinatorics, True-False
Polynomial Probability 600 27
Zeros and Ones 300 26 Combinatorics
Uneven numbers 100 164 Number-Theory
Fill the square 400 16 Combinatorics, Algebra
Pencils 400 7 Combinatorics
Sum probability 300 84 Combinatorics, Algebra, Probablilities
Simple sum 300 31 Algebra, Sums
Sharingan 500 11 Geometry
Just Easy Sum 100 165 Algebra
Lin's Octagon 300 45 Combinatorics
Independence 300 10 Combinatorics, Probabilities
Point O 400 98 Geometry
Sum of digits 2020 200 155 Number-Theory, Digits
Love Triangle 400 6 Combinatorics
Not fibbo 300 57 Algebra, Sequences
Integer sequence 400 13 Algebra, Sequences
6-sums 100 134 Algebra
Number Coloring 400 23 Combinatorics
Cool-divisble numbers 300 69 Number-Theory, Digits
!Fancy cubic 300 68 Algebra, Number-Theory
Binary Sum 500 27 Number-Theory, Algebra
Temirlan's cake 100 785 Algebra, Arithmetics
Math lesson 400 42 Number-Theory, Combinatorics
Fancy limit 400 31 Algebra, Sequences
Cube Cube Square 300 28 Algebra, Number-Theory
Smallest degree 400 11 Algebra, Polynomials
Soccer Game 500 11 Combinatorics
Odd polynomial 400 103 Algebra, Polynomials
Five Primes 100 161 Number-Theory
ADAD 400 37 Geometry, Circles
Again these rooks 600 58 Combinatorics, Boards
Rooks 600 16 Combinatorics
Mathrix 600 5 Algebra, Number-Theory, Matrices
Obtuser 400 19 Combinatorics, Geometry
Small triangle 600 15 Geometry, Areas
Seven eleven 200 64 Algebra
Factorial Factor 200 65 Number-Theory, Combinatorics
Cemicirlces 300 21 Geometry, Areas
Infinite game 500 42 Combinatorics, Games
Rotating Hexagon 600 3 Geometry, Combinatorics
New FE 300 52 Functional-Equations
Not constant 300 28 Algebra, Number-Theory
5 instead of 1 200 186
Revolution 300 23 Combinatorics
Lucky numbers 100 163 Digits, Algebra
Big set 400 15 Combinatorics
Teleporting button 300 19 Combinatorics, Probabilities
Pentagon 500 17 Geometry, Combinatorics, Pentagons
Cuboid 300 28 Number-Theory
Function 300 205 Algebra, Functional-Equations
Sum of Digits 200 75 Number-Theory, Digits
Reverse Product 400 36 Combinatorics, Number-Theory
Sequence 300 46 Number-Theory
Hexagonial 300 14 Geometry, Hexagons
!Fancy FE 500 9 Algebra, Polynomials
!Fancy sequence 600 8 Combinatorics, Number-Theory
MathForces Store 500 32 Combinatorics
Maximum of Minimum 500 27 Algebra, Inequalities
Cyclic Q 600 16 Geometry
School Clubs 500 3 Combinatorics
Smallest number 600 244 Algebra
Flip 200 65 Algebra, Number-Theory, Digits
Minimizing Fibb 400 121 Algebra, Sequences
Chords 300 12 Geometry, Circles
Unordered triplet 300 57 Algebra, Number-Theory
Quadratic 300 51 Algebra, Number-Theory
Not your business 200 193 Geometry, Tangents
Administrative function 900 9
Negative roots 300 39 Algebra
Poly 600 10 Algebra
Fancy integral 700 32 Algebra, Sums, Integrals
Discriminant 400 35 Algebra, Polynomials
Too much 600 27 Algebra, Equations
Triangle and Square 200 68 Geometry
Also palindrome 400 46 Digits
Fancy polynomial 800 20 Algebra, Polynomials
D Flags 200 74 Web-Search
Product of areas 300 42 Geometry
6 Apart 500 89 Geometry, 3D
Inverse Sum in Triangle 500 11 Geometry
Functional Eq 700 16 Algebra, Functional-Equations
Checkboard 600 3 Combinatorics
Equiangular Hexagon 400 11
Half of Octahedron 400 123 Combinatorics, Graphs