MathForces: Math Olympiads
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Name сортировать Difficulty сортировать Users
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Oh-matrix 300 148 Algebra, Linear-Algebra, Matrices
Interesting functions 600 12 Number-Theory
2020 digit 200 502 Algebra, Digits
Fancy integral 700 32 Algebra, Sums, Integrals
Test 100 841
Sum of four 100 410 Combinatorics, Digits
Sharingan 500 11 Geometry
Product of differences 300 122 Algebra, Inequalities
Special square 500 54 Number-Theory, Squares
Viet said 500 105 Number-Theory
Fancy limit 400 31 Algebra, Sequences
Simple sum 300 30 Algebra, Sums
Relatively prime with 2020 200 230 Number-Theory, Prime-Numbers
Friendly Team 400 12 Combinatorics
Odd divisors 300 86 Number-Theory, Divisors
Convex triangle 400 38 Geometry, Combinatorics
Lin the Racoon's Debut 600 18 Combinatorics, Raccoon
Positive product of sums 300 71 Algebra, Equations, Number-Theory
C Sum 300 117 Algebra, Combinatorics, Formulas
Squared fours 200 200 Number-Theory, Algebra
Powers of 6 500 39 Number-theory, Equations
Parking 300 188 Combinatorics
Similar polynomials 500 52 Algebra, Polynomials
Cyclic Areas 300 28 Geometry, Areas
Divisibility by 4 200 226 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
Cemicirlces 300 19 Geometry, Areas
First geometry 400 61 Geometry, Circles, Tangents
Weird games 500 20 Combinatorics
Binary polindromes 300 5
335577 500 34 Number-Theory, Powers
Many digits 400 108 Algebra
x[x] 400 54 Number-Theory, Floor-Function
Angle chasing 300 133 Geometry, Angle-Chasing
Again these rooks 600 58 Combinatorics, Boards
Big set 400 15 Combinatorics
2020 Palindromes 100 372 Combinatorics, Palindromes
Progressive sequence 500 18 Algebra, Number-Theory, Sequences
Naruto cubed 300 0
Good Order 600 3 Algebra, Number-Theory
Seven eleven 200 61 Algebra
Right Square 300 0
What a function 400 38 Algebra, Functions
Tricky polynomial 600 47 Algebra, Polynomials, Complex-Numbers
Pencils 400 7 Combinatorics
Checkboard 600 3 Combinatorics
Negative roots 300 35 Algebra
Odd factors 500 27
Just sequence 300 148 Algebra, Sequences
One three-digit number 200 258 Algebra, Inequalities
Bingo! 200 156 Combinatorics, Probabilities
Cubical squares 100 623 Algebra, Exponents
Almost squared numbers 300 46 Number-Theory
P5 300 0
Exactly two roots 400 50 Number-Theory, Equations
Prime powers 400 37
Administrative function 900 9
Prime Sets 500 8 Combinatorics, Number-Theory
Friendly rooks 200 163 Combinatorics, Chess
Simple expression 300 82 Algebra, Combinatorics
Sqaure in square 600 39 Geometry, Squares
Diameter 400 53 Geometry, Perpendiculars
Orthocenter 600 12 Geometry, Circles, Tangents
Zero sequence 200 71 Algebra, Sequences
Number Coloring 400 22 Combinatorics
Arithmetic derivative 500 42 Number-Theory, Functions
Tricky 400 61 Number-Theory
NRD pair 200 94 Number-Theory, Prime-Numbers
Concetric 200 64 Geometry
Unfair Game 400 31 Combinatorics
Tommorow's day 100 653 Algebra, Digits
Nice Integer 400 5 Number-Theory, Algebra, Polynomials
Switchers 400 44 Combinatorics, Sets
Lin's Game 400 9 Combinatorics, Games
Functional Eq 700 16 Algebra, Functional-Equations
MTMTK System 400 21 Algebra, Equations
Triangle in Hexagon 200 56 Geometry, Probabilities
Teleporting button 300 18 Combinatorics, Probabilities
More dominos 400 31 Combinatorics
Square multiples of 24 200 230
VNT 500 97 Number-Theory, LTE
Equilateral Triangles 200 213 Combinatorics, Grids
Rooks 600 16 Combinatorics
Rotating Hexagon 600 3 Geometry, Combinatorics
U turn 200 145 Algebra, Number-Theory, Digits
2+1 200 249 Algebra, Arithmetics
Integer sequence 400 13 Algebra, Sequences
Zeros and Ones 300 25 Combinatorics
Cool-divisble numbers 300 66 Number-Theory, Digits
Reverse Product 400 36 Combinatorics, Number-Theory
Semiperimeter 200 42 Geometry
Powered Numbers (Duplicate) 300 50 Algebra, Number-Theory
Inverse Sum in Triangle 500 10 Geometry
Gineq 300 50 Geometry
Friends Playing 600 18 Combinatorics
Numbers ratio 100 597 Algebra, Arithmetics
Digital Cubes 100 90 Algebra, Digits
Fractions 300 114 Algebra
Rational Irrational 300 33 Algebra, Number-Theory
Flights 500 9 Combinatorics, Graphs
Difference of squares 200 49 Combinatorics, Number-Theory
Money date 100 321 Combinatorics, Probabilities
ADAD (Duplicate) 400 40 Geometry, Circles
Max Area 300 37 Geometry
!Fancy polygon 400 38 Geometry, 3D
Sum of Digits 200 69 Number-Theory, Digits
New Cake 400 26 Geometry
Expanding brackets 300 146 Algebra, Polynomials
Total inversion 500 31 Combinatorics, Geometry
Half Integers 500 2 Combinatorics, Geometry
Four equal angles 200 71 Geometry
Sequenta 300 67 Algebra, Sequences
Sum of Squares 500 24 Geometry
Mathrix 600 5 Algebra, Number-Theory, Matrices
Subsets Collection 600 27 Combinatorics, Sets
Interesting permutations 600 6 Number-Theory
Simple Altai 400 18 Number-Theory
Uneven numbers 100 129 Number-Theory
Not your business 200 187 Geometry, Tangents
Small triangular numbers 200 132 Algebra, Number-Theory
!Fancy grid 700 9 Combinatorics, Graphs
Smallest fraction 300 25 Algebra, Number-Theory
Daniyar's Friends 300 28
Sum of digits 2020 200 152 Number-Theory, Digits
Lin does shopping 200 28 Algebra, Number-Theory
Area of triangle 200 202 Geometry, Squares, Areas
Four on a circle 400 43 Geometry, Circles
Divisible sets 300 6 Combinatorics
Powered Numbers 300 51 Algebra, Number-Theory
Base4 300 31 Number-Theory
Rational Polynomial 400 25 Algebra, Polynomials
Fancy meal 300 76
Probability computer 300 35 Combinatorics
Random numbers 400 17 Algebra, Combinatorics
Cyclic Q 600 16 Geometry
Point O 400 98 Geometry
0,1,2 polynomial 400 20 Combinatorics, Algebra
Random answer 100 462 Random
Air MF 500 6 Combinatorics
Irreducible Fractions 200 82 Number-Theory
Fancy polynomial 800 20 Algebra, Polynomials
These Triangles 300 19 Geometry, Combinatorics
Polynomial Probability 600 27
Lin Jumper 500 15 Combinatorics
Weird equation 200 195 Algebra, Polynomials
Fill the square 400 16 Combinatorics, Algebra
Where is my husband 500 23 Combinatorics, True-False
Smallest degree 400 10 Algebra, Polynomials
Sum probability 300 82 Combinatorics, Algebra, Probablilities
Hexagonial 300 12 Geometry, Hexagons
Also palindrome 400 46 Digits
Solutions on the interval 300 57 Algebra, Equations
!Fancy cubic 300 67 Algebra, Number-Theory
Temirlan's cake 100 743 Algebra, Arithmetics
Just Easy Sum 100 146 Algebra
Lin's Numbers 400 31 Number-Theory, Algebra
Almost fixed 400 13 Combinatorics, Algebra
6-sums 100 116 Algebra
Not fibbo 300 55 Algebra, Sequences
Revolution 300 21 Combinatorics
Concatenate 500 15 Number-Theory
Soccer Game 500 11 Combinatorics
Binary Sum 500 26 Number-Theory, Algebra
MathForces Store 500 32 Combinatorics
Math lesson 400 40 Number-Theory, Combinatorics
ADAD 400 37 Geometry, Circles
Function 300 196 Algebra, Functional-Equations
Cube Cube Square 300 26 Algebra, Number-Theory
Smallest number 600 244 Algebra
Factorial Factor 200 63 Number-Theory, Combinatorics
Lucky numbers 100 151 Digits, Algebra
Regular Polygons 200 52 Geometry, Combinatorics
Odd polynomial 400 103 Algebra, Polynomials
5th power equation 500 63 Algebra, Equations
Five Primes 100 138 Number-Theory
Sharp inequality 500 10 Algebra, Inequalities
Sequence 300 46 Number-Theory
Not constant 300 26 Algebra, Number-Theory
Love Triangle 400 6 Combinatorics
5 instead of 1 200 181
Small triangle 600 15 Geometry, Areas
Triangle and Square 200 63 Geometry
Quadratic 300 48 Algebra, Number-Theory
New FE 300 50 Functional-Equations
Obtuser 400 19 Combinatorics, Geometry
Minimizing Fibb 400 120 Algebra, Sequences
Bools and cows 200 163 Random, Combinatorics
Maximum of Minimum 500 27 Algebra, Inequalities
Poly 600 10 Algebra
Novirus 300 81 Combinatorics, Graphs
Pentagon 500 17 Geometry, Combinatorics, Pentagons
Cuboid 300 27 Number-Theory
!Fancy FE 500 9 Algebra, Polynomials
Infinite game 500 41 Combinatorics, Games
Fancy point 500 11 Geometry
Unordered triplet 300 50 Algebra, Number-Theory
Chords 300 10 Geometry, Circles
Circled 700 13 Geometry, Combinatorics
Flip 200 64 Algebra, Number-Theory, Digits
Ordered papers 300 34 Combinatorics
Quadratic Sets 400 8 Combinatorics, Sets, Algebra
D Flags 200 73 Web-Search
Permutational Polynomial 500 32 Algebra
Excirlce 400 3 Geometry
Too much 600 27 Algebra, Equations
School Clubs 500 3 Combinatorics
Discriminant 400 34 Algebra, Polynomials
Magic Ruler 500 6 Geometry, Combinatorics
Monochromatics 400 6 Combinatorics, Graphs
Half of Octahedron 400 123 Combinatorics, Graphs
Nice polynomial 700 7 Algebra
Lin's Octagon 300 45 Combinatorics
Tan-Sin 500 39 Geometry, Trigonometry
Product of areas 300 40 Geometry
6 Apart 500 87 Geometry, 3D
Hold me 500 19 Algebra
!Fancy sequence 600 8 Combinatorics, Number-Theory
Independence 300 10 Combinatorics, Probabilities
Equiangular Hexagon 400 11