MathForces: Math Olympiads
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Name сортировать Difficulty сортировать Users
Solved сортировать
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Lin's Game 400 9 Combinatorics, Games
Excirlce 400 2 Geometry
Test 100 723
Diameter 400 50 Geometry, Perpendiculars
Cubical squares 100 571 Algebra, Exponents
Oh-matrix 300 133 Algebra, Linear-Algebra, Matrices
2020 digit 200 457 Algebra, Digits
Good Order 600 3 Algebra, Number-Theory
Almost fixed 400 13 Combinatorics, Algebra
Permutational Polynomial 500 30 Algebra
Fractions 300 102 Algebra
Special square 500 54 Number-Theory, Squares
Product of differences 300 101 Algebra, Inequalities
Sum of four 100 362 Combinatorics, Digits
Triangle in hyperbola 400 61 Algebra, Geometry, Coordinates
Viet said 500 95 Number-Theory
Concatenate 500 15 Number-Theory
2020 Palindromes 100 334 Combinatorics, Palindromes
C Sum 300 105 Algebra, Combinatorics, Formulas
Convex triangle 400 38 Geometry, Combinatorics
Positive product of sums 300 61 Algebra, Equations, Number-Theory
Powers of 6 500 36 Number-theory, Equations
Squared fours 200 176 Number-Theory, Algebra
Relatively prime with 2020 200 212 Number-Theory, Prime-Numbers
Odd divisors 300 79 Number-Theory, Divisors
Divisibility by 4 200 203 Number-Theory, Digits
!Fancy sequence 600 8 Combinatorics, Number-Theory
Flights 500 9 Combinatorics, Graphs
Polynomial without 4 400 40 Algebra, Polynomials
Tricky sequence 500 28 Number-Theory, Algebra, Sequences
All such 400 61 Number-Theory, Equations
Similar polynomials 500 47 Algebra, Polynomials
Many digits 400 98 Algebra
First geometry 400 58 Geometry, Circles, Tangents
Tricky polynomial 600 42 Algebra, Polynomials, Complex-Numbers
Integer sequence 400 9 Algebra, Sequences
x[x] 400 49 Number-Theory, Floor-Function
Friends Playing 600 17 Combinatorics
Lin Jumper 500 15 Combinatorics
335577 500 32 Number-Theory, Powers
Sum of digits 2020 200 146 Number-Theory, Digits
Angle chasing 300 124 Geometry, Angle-Chasing
Fancy meal 300 73
One three-digit number 200 247 Algebra, Inequalities
Solutions on the interval 300 55 Algebra, Equations
Progressive sequence 500 18 Algebra, Number-Theory, Sequences
Tricky 400 60 Number-Theory
Numbers ratio 100 565 Algebra, Arithmetics
Cyclic Q 600 14 Geometry
Lin the Racoon's Debut 600 16 Combinatorics, Raccoon
What a function 400 37 Algebra, Functions
Nice polynomial 700 7 Algebra
Zeros and Ones 300 19 Combinatorics
Fancy polynomial 800 20 Algebra, Polynomials
Odd factors 500 26
Just sequence 300 141 Algebra, Sequences
Almost squared numbers 300 44 Number-Theory
Hexagonial 300 10 Geometry, Hexagons
Prime powers 400 37
Function 300 190 Algebra, Functional-Equations
Friendly rooks 200 151 Combinatorics, Chess
Cemicirlces 300 13 Geometry, Areas
Minimizing Fibb 400 119 Algebra, Sequences
Exactly two roots 400 49 Number-Theory, Equations
Simple expression 300 78 Algebra, Combinatorics
Sqaure in square 600 35 Geometry, Squares
Orthocenter 600 12 Geometry, Circles, Tangents
Zero sequence 200 67 Algebra, Sequences
Ordered papers 300 32 Combinatorics
Concetric 200 59 Geometry
NRD pair 200 89 Number-Theory, Prime-Numbers
Square multiples of 24 200 220
Tommorow's day 100 616 Algebra, Digits
U turn 200 143 Algebra, Number-Theory, Digits
Arithmetic derivative 500 40 Number-Theory, Functions
Friendly Team 400 11 Combinatorics
Revolution 300 19 Combinatorics
Prime Sets 500 8 Combinatorics, Number-Theory
Switchers 400 44 Combinatorics, Sets
Sequenta 300 64 Algebra, Sequences
MTMTK System 400 19 Algebra, Equations
Weird games 500 20 Combinatorics
VNT 500 96 Number-Theory, LTE
Parking 300 183 Combinatorics
Novirus 300 81 Combinatorics, Graphs
Equilateral Triangles 200 205 Combinatorics, Grids
6 Apart 500 86 Geometry, 3D
Simple sum 300 26 Algebra, Sums
More dominos 400 29 Combinatorics
Semiperimeter 200 38 Geometry
Random answer 100 426 Random
Rational Irrational 300 28 Algebra, Number-Theory
Gineq 300 47 Geometry
2+1 200 232 Algebra, Arithmetics
Cool-divisble numbers 300 64 Number-Theory, Digits
Uneven numbers 100 62 Number-Theory
D Flags 200 70 Web-Search
Regular Polygons 200 46 Geometry, Combinatorics
Sum of Digits 200 62 Number-Theory, Digits
Difference of squares 200 32 Combinatorics, Number-Theory
Powered Numbers (Duplicate) 300 49 Algebra, Number-Theory
Digital Cubes 100 73 Algebra, Digits
Soccer Game 500 11 Combinatorics
Max Area 300 35 Geometry
ADAD (Duplicate) 400 39 Geometry, Circles
Mathrix 600 3 Algebra, Number-Theory, Matrices
Big set 400 15 Combinatorics
Simple Altai 400 18 Number-Theory
Expanding brackets 300 144 Algebra, Polynomials
New Cake 400 26 Geometry
Independence 300 10 Combinatorics, Probabilities
Math lesson 400 39 Number-Theory, Combinatorics
New FE 300 48 Functional-Equations
Probability computer 300 24 Combinatorics
Divisible sets 300 6 Combinatorics
Small triangular numbers 200 129 Algebra, Number-Theory
Four equal angles 200 48 Geometry
Interesting functions 600 12 Number-Theory
Subsets Collection 600 25 Combinatorics, Sets
Sum of Squares 500 24 Geometry
Sequence 300 42 Number-Theory
Smallest fraction 300 16 Algebra, Number-Theory
Half Integers 500 2 Combinatorics, Geometry
Fancy limit 400 31 Algebra, Sequences
Point O 400 98 Geometry
Area of triangle 200 195 Geometry, Squares, Areas
ADAD 400 37 Geometry, Circles
Random numbers 400 14 Algebra, Combinatorics
Circled 700 12 Geometry, Combinatorics
Four on a circle 400 43 Geometry, Circles
Cuboid 300 26 Number-Theory
Teleporting button 300 11 Combinatorics, Probabilities
Rational Polynomial 400 24 Algebra, Polynomials
5th power equation 500 60 Algebra, Equations
Base4 300 30 Number-Theory
Polynomial Probability 600 26
Powered Numbers 300 50 Algebra, Number-Theory
Cyclic Areas 300 25 Geometry, Areas
Unordered triplet 300 32 Algebra, Number-Theory
Lucky numbers 100 127 Digits, Algebra
0,1,2 polynomial 400 20 Combinatorics, Algebra
Sharingan 500 10 Geometry
Odd polynomial 400 102 Algebra, Polynomials
Irreducible Fractions 200 68 Number-Theory
Equiangular Hexagon 400 10
Nice Integer 400 5 Number-Theory, Algebra, Polynomials
Smallest degree 400 8 Algebra, Polynomials
Temirlan's cake 100 699 Algebra, Arithmetics
!Fancy FE 500 9 Algebra, Polynomials
Flip 200 62 Algebra, Number-Theory, Digits
Monochromatics 400 5 Combinatorics, Graphs
Smallest number 600 242 Algebra
Administrative function 900 9
Interesting permutations 600 2 Number-Theory
Fill the square 400 16 Combinatorics, Algebra
Sum probability 300 75 Combinatorics, Algebra, Probablilities
Rooks 600 14 Combinatorics
Triangle and Square 200 54 Geometry
Fancy point 500 11 Geometry
Functional Eq 700 15 Algebra, Functional-Equations
Not fibbo 300 52 Algebra, Sequences
Just Easy Sum 100 113 Algebra
Bingo! 200 144 Combinatorics, Probabilities
5 instead of 1 200 176
!Fancy cubic 300 64 Algebra, Number-Theory
Fancy integral 700 31 Algebra, Sums, Integrals
Magic Ruler 500 6 Geometry, Combinatorics
Binary Sum 500 25 Number-Theory, Algebra
Again these rooks 600 57 Combinatorics, Boards
Weird equation 200 187 Algebra, Polynomials
6-sums 100 95 Algebra
These Triangles 300 14 Geometry, Combinatorics
Total inversion 500 31 Combinatorics, Geometry
School Clubs 500 3 Combinatorics
Maximum of Minimum 500 25 Algebra, Inequalities
Sharp inequality 500 10 Algebra, Inequalities
Cube Cube Square 300 25 Algebra, Number-Theory
Factorial Factor 200 57 Number-Theory, Combinatorics
Air MF 500 6 Combinatorics
Negative roots 300 26 Algebra
Not constant 300 23 Algebra, Number-Theory
Five Primes 100 108 Number-Theory
Triangle in Hexagon 200 48 Geometry, Probabilities
!Fancy grid 700 9 Combinatorics, Graphs
Lin's Numbers 400 28 Number-Theory, Algebra
Rotating Hexagon 600 2 Geometry, Combinatorics
!Fancy polygon 400 38 Geometry, 3D
Inverse Sum in Triangle 500 10 Geometry
Number Coloring 400 21 Combinatorics
Daniyar's Friends 300 27
Quadratic 300 44 Algebra, Number-Theory
Product of areas 300 39 Geometry
Hold me 500 18 Algebra
Also palindrome 400 44 Digits
Money date 100 293 Combinatorics, Probabilities
Poly 600 9 Algebra
Lin does shopping 200 25 Algebra, Number-Theory
Obtuser 400 18 Combinatorics, Geometry
Love Triangle 400 5 Combinatorics
Lin's Octagon 300 43 Combinatorics
Pentagon 500 17 Geometry, Combinatorics, Pentagons
Reverse Product 400 35 Combinatorics, Number-Theory
Infinite game 500 39 Combinatorics, Games
Tan-Sin 500 37 Geometry, Trigonometry
MathForces Store 500 32 Combinatorics
Chords 300 10 Geometry, Circles
Quadratic Sets 400 7 Combinatorics, Sets, Algebra
Not your business 200 184 Geometry, Tangents
Half of Octahedron 400 123 Combinatorics, Graphs
Unfair Game 400 31 Combinatorics
Too much 600 25 Algebra, Equations
Bools and cows 200 154 Random, Combinatorics
Seven eleven 200 51 Algebra
Checkboard 600 3 Combinatorics
Discriminant 400 31 Algebra, Polynomials
Small triangle 600 13 Geometry, Areas
Where is my husband 500 23 Combinatorics, True-False
Pencils 400 7 Combinatorics