MathForces: Math Olympiads
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Name сортировать Difficulty сортировать Users
Solved сортировать
Tags сортировать
Lin's Game 400 9 Combinatorics, Games
Small triangle 600 13 Geometry, Areas
Lin Jumper 500 15 Combinatorics
2020 digit 200 464 Algebra, Digits
Test 100 744
Oh-matrix 300 135 Algebra, Linear-Algebra, Matrices
Cubical squares 100 583 Algebra, Exponents
Love Triangle 400 5 Combinatorics
Special square 500 54 Number-Theory, Squares
5th power equation 500 61 Algebra, Equations
Sum of four 100 371 Combinatorics, Digits
Viet said 500 97 Number-Theory
Triangle in hyperbola 400 61 Algebra, Geometry, Coordinates
Product of differences 300 106 Algebra, Inequalities
Lin does shopping 200 25 Algebra, Number-Theory
Relatively prime with 2020 200 215 Number-Theory, Prime-Numbers
Positive product of sums 300 62 Algebra, Equations, Number-Theory
Convex triangle 400 38 Geometry, Combinatorics
Odd divisors 300 80 Number-Theory, Divisors
Powers of 6 500 36 Number-theory, Equations
School Clubs 500 3 Combinatorics
Independence 300 10 Combinatorics, Probabilities
C Sum 300 107 Algebra, Combinatorics, Formulas
2020 Palindromes 100 339 Combinatorics, Palindromes
Fractions 300 105 Algebra
Squared fours 200 178 Number-Theory, Algebra
!Fancy sequence 600 8 Combinatorics, Number-Theory
Divisibility by 4 200 206 Number-Theory, Digits
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
Cemicirlces 300 15 Geometry, Areas
335577 500 32 Number-Theory, Powers
Solutions on the interval 300 55 Algebra, Equations
Sharingan 500 10 Geometry
Weird games 500 20 Combinatorics
Permutational Polynomial 500 30 Algebra
Fancy point 500 11 Geometry
Pencils 400 7 Combinatorics
Angle chasing 300 125 Geometry, Angle-Chasing
Progressive sequence 500 18 Algebra, Number-Theory, Sequences
One three-digit number 200 249 Algebra, Inequalities
Tricky 400 60 Number-Theory
Fancy polynomial 800 20 Algebra, Polynomials
Lin the Racoon's Debut 600 16 Combinatorics, Raccoon
What a function 400 37 Algebra, Functions
Hexagonial 300 10 Geometry, Hexagons
Concatenate 500 15 Number-Theory
Odd factors 500 26
Cyclic Q 600 14 Geometry
Just sequence 300 142 Algebra, Sequences
Almost squared numbers 300 44 Number-Theory
Tan-Sin 500 37 Geometry, Trigonometry
Zeros and Ones 300 20 Combinatorics
Function 300 190 Algebra, Functional-Equations
Prime powers 400 37
Daniyar's Friends 300 27
Minimizing Fibb 400 119 Algebra, Sequences
Friendly rooks 200 151 Combinatorics, Chess
Money date 100 297 Combinatorics, Probabilities
Exactly two roots 400 49 Number-Theory, Equations
Simple expression 300 78 Algebra, Combinatorics
NRD pair 200 90 Number-Theory, Prime-Numbers
Novirus 300 81 Combinatorics, Graphs
Sqaure in square 600 35 Geometry, Squares
Orthocenter 600 12 Geometry, Circles, Tangents
Zero sequence 200 67 Algebra, Sequences
Square multiples of 24 200 220
Arithmetic derivative 500 40 Number-Theory, Functions
Numbers ratio 100 571 Algebra, Arithmetics
Tommorow's day 100 620 Algebra, Digits
Revolution 300 19 Combinatorics
U turn 200 143 Algebra, Number-Theory, Digits
Circled 700 12 Geometry, Combinatorics
Switchers 400 44 Combinatorics, Sets
Sequenta 300 64 Algebra, Sequences
MTMTK System 400 19 Algebra, Equations
D Flags 200 70 Web-Search
VNT 500 96 Number-Theory, LTE
Infinite game 500 39 Combinatorics, Games
Rotating Hexagon 600 2 Geometry, Combinatorics
Friendly Team 400 11 Combinatorics
Equilateral Triangles 200 205 Combinatorics, Grids
Simple sum 300 26 Algebra, Sums
6 Apart 500 86 Geometry, 3D
More dominos 400 29 Combinatorics
Also palindrome 400 44 Digits
Uneven numbers 100 80 Number-Theory
Gineq 300 47 Geometry
Rational Irrational 300 28 Algebra, Number-Theory
2+1 200 235 Algebra, Arithmetics
Random answer 100 434 Random
Cool-divisble numbers 300 64 Number-Theory, Digits
Semiperimeter 200 39 Geometry
Soccer Game 500 11 Combinatorics
Monochromatics 400 5 Combinatorics, Graphs
Difference of squares 200 35 Combinatorics, Number-Theory
Powered Numbers (Duplicate) 300 49 Algebra, Number-Theory
Digital Cubes 100 78 Algebra, Digits
Sum of Digits 200 63 Number-Theory, Digits
Rooks 600 14 Combinatorics
ADAD (Duplicate) 400 39 Geometry, Circles
Expanding brackets 300 144 Algebra, Polynomials
Max Area 300 36 Geometry
Simple Altai 400 18 Number-Theory
Friends Playing 600 17 Combinatorics
Math lesson 400 39 Number-Theory, Combinatorics
New Cake 400 26 Geometry
Diameter 400 50 Geometry, Perpendiculars
Four equal angles 200 52 Geometry
New FE 300 48 Functional-Equations
Divisible sets 300 6 Combinatorics
Small triangular numbers 200 130 Algebra, Number-Theory
Subsets Collection 600 25 Combinatorics, Sets
Mathrix 600 3 Algebra, Number-Theory, Matrices
Functional Eq 700 15 Algebra, Functional-Equations
Sum of Squares 500 24 Geometry
Where is my husband 500 23 Combinatorics, True-False
Smallest fraction 300 18 Algebra, Number-Theory
Sequence 300 42 Number-Theory
Random numbers 400 16 Algebra, Combinatorics
Area of triangle 200 195 Geometry, Squares, Areas
Cuboid 300 26 Number-Theory
Sum of digits 2020 200 147 Number-Theory, Digits
Point O 400 98 Geometry
Concetric 200 59 Geometry
Four on a circle 400 43 Geometry, Circles
Powered Numbers 300 50 Algebra, Number-Theory
Base4 300 30 Number-Theory
Cyclic Areas 300 25 Geometry, Areas
Rational Polynomial 400 24 Algebra, Polynomials
Polynomial Probability 600 26
Lin's Octagon 300 43 Combinatorics
Product of areas 300 39 Geometry
Lucky numbers 100 129 Digits, Algebra
0,1,2 polynomial 400 20 Combinatorics, Algebra
Irreducible Fractions 200 72 Number-Theory
Odd polynomial 400 102 Algebra, Polynomials
Regular Polygons 200 47 Geometry, Combinatorics
Equiangular Hexagon 400 10
Unordered triplet 300 37 Algebra, Number-Theory
Temirlan's cake 100 705 Algebra, Arithmetics
!Fancy FE 500 9 Algebra, Polynomials
Smallest degree 400 8 Algebra, Polynomials
Smallest number 600 242 Algebra
Flip 200 62 Algebra, Number-Theory, Digits
Nice polynomial 700 7 Algebra
Fill the square 400 16 Combinatorics, Algebra
Sum probability 300 75 Combinatorics, Algebra, Probablilities
Fancy limit 400 31 Algebra, Sequences
Administrative function 900 9
Almost fixed 400 13 Combinatorics, Algebra
!Fancy cubic 300 64 Algebra, Number-Theory
5 instead of 1 200 176
Not fibbo 300 52 Algebra, Sequences
Just Easy Sum 100 117 Algebra
Fancy meal 300 73
Bingo! 200 144 Combinatorics, Probabilities
6-sums 100 97 Algebra
Binary Sum 500 25 Number-Theory, Algebra
Weird equation 200 188 Algebra, Polynomials
ADAD 400 37 Geometry, Circles
Again these rooks 600 57 Combinatorics, Boards
Reverse Product 400 35 Combinatorics, Number-Theory
Maximum of Minimum 500 26 Algebra, Inequalities
Sharp inequality 500 10 Algebra, Inequalities
Cube Cube Square 300 26 Algebra, Number-Theory
Bools and cows 200 154 Random, Combinatorics
Five Primes 100 115 Number-Theory
Good Order 600 3 Algebra, Number-Theory
Number Coloring 400 21 Combinatorics
Inverse Sum in Triangle 500 10 Geometry
Factorial Factor 200 58 Number-Theory, Combinatorics
Triangle in Hexagon 200 49 Geometry, Probabilities
Negative roots 300 29 Algebra
Lin's Numbers 400 28 Number-Theory, Algebra
Not constant 300 24 Algebra, Number-Theory
Teleporting button 300 11 Combinatorics, Probabilities
!Fancy polygon 400 38 Geometry, 3D
These Triangles 300 14 Geometry, Combinatorics
Triangle and Square 200 55 Geometry
Quadratic 300 44 Algebra, Number-Theory
Probability computer 300 24 Combinatorics
Magic Ruler 500 6 Geometry, Combinatorics
Hold me 500 18 Algebra
Poly 600 9 Algebra
MathForces Store 500 32 Combinatorics
Pentagon 500 17 Geometry, Combinatorics, Pentagons
Flights 500 9 Combinatorics, Graphs
Excirlce 400 3 Geometry
Interesting functions 600 12 Number-Theory
Interesting permutations 600 2 Number-Theory
Nice Integer 400 5 Number-Theory, Algebra, Polynomials
Quadratic Sets 400 7 Combinatorics, Sets, Algebra
Chords 300 10 Geometry, Circles
Unfair Game 400 31 Combinatorics
Obtuser 400 18 Combinatorics, Geometry
Not your business 200 184 Geometry, Tangents
Total inversion 500 31 Combinatorics, Geometry
Prime Sets 500 8 Combinatorics, Number-Theory
Half of Octahedron 400 123 Combinatorics, Graphs
Too much 600 25 Algebra, Equations
Seven eleven 200 53 Algebra
Half Integers 500 2 Combinatorics, Geometry
!Fancy grid 700 9 Combinatorics, Graphs
Discriminant 400 32 Algebra, Polynomials
Fancy integral 700 31 Algebra, Sums, Integrals
Ordered papers 300 32 Combinatorics
Checkboard 600 3 Combinatorics
Big set 400 15 Combinatorics
Air MF 500 6 Combinatorics
Parking 300 183 Combinatorics