MathForces: Math Olympiads
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Name сортировать Difficulty сортировать Users
Solved сортировать
Tags сортировать
Lin's Game 400 9 Combinatorics, Games
Also palindrome 400 44 Digits
Test 100 820
2020 digit 200 494 Algebra, Digits
Triangle in Hexagon 200 53 Geometry, Probabilities
Oh-matrix 300 145 Algebra, Linear-Algebra, Matrices
Again these rooks 600 58 Combinatorics, Boards
Lin does shopping 200 26 Algebra, Number-Theory
Sum of four 100 398 Combinatorics, Digits
Special square 500 54 Number-Theory, Squares
Almost fixed 400 13 Combinatorics, Algebra
Viet said 500 104 Number-Theory
Product of differences 300 118 Algebra, Inequalities
Total inversion 500 31 Combinatorics, Geometry
Positive product of sums 300 69 Algebra, Equations, Number-Theory
Convex triangle 400 38 Geometry, Combinatorics
2020 Palindromes 100 361 Combinatorics, Palindromes
Lin the Racoon's Debut 600 18 Combinatorics, Raccoon
C Sum 300 114 Algebra, Combinatorics, Formulas
Squared fours 200 195 Number-Theory, Algebra
Cubical squares 100 613 Algebra, Exponents
Powers of 6 500 39 Number-theory, Equations
Odd divisors 300 85 Number-Theory, Divisors
Relatively prime with 2020 200 226 Number-Theory, Prime-Numbers
Similar polynomials 500 52 Algebra, Polynomials
Divisibility by 4 200 220 Number-Theory, Digits
Pencils 400 7 Combinatorics
All such 400 67 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
Binary polindromes 300 2
Many digits 400 107 Algebra
First geometry 400 61 Geometry, Circles, Tangents
335577 500 33 Number-Theory, Powers
Inverse Sum in Triangle 500 10 Geometry
Love Triangle 400 6 Combinatorics
x[x] 400 54 Number-Theory, Floor-Function
Lin Jumper 500 15 Combinatorics
Angle chasing 300 130 Geometry, Angle-Chasing
Progressive sequence 500 18 Algebra, Number-Theory, Sequences
Naruto cubed 300 0
Checkboard 600 3 Combinatorics
Reverse Product 400 36 Combinatorics, Number-Theory
Negative roots 300 33 Algebra
Right Square 300 0
What a function 400 38 Algebra, Functions
Tricky polynomial 600 47 Algebra, Polynomials, Complex-Numbers
Good Order 600 3 Algebra, Number-Theory
Seven eleven 200 59 Algebra
Odd factors 500 27
Bingo! 200 154 Combinatorics, Probabilities
Almost squared numbers 300 44 Number-Theory
One three-digit number 200 255 Algebra, Inequalities
Just sequence 300 147 Algebra, Sequences
P5 300 0
Exactly two roots 400 50 Number-Theory, Equations
Prime powers 400 37
Circled 700 13 Geometry, Combinatorics
Friendly rooks 200 158 Combinatorics, Chess
Sqaure in square 600 38 Geometry, Squares
Zero sequence 200 68 Algebra, Sequences
Simple expression 300 80 Algebra, Combinatorics
Orthocenter 600 12 Geometry, Circles, Tangents
Number Coloring 400 22 Combinatorics
Functional Eq 700 16 Algebra, Functional-Equations
Simple sum 300 28 Algebra, Sums
Not your business 200 185 Geometry, Tangents
Excirlce 400 3 Geometry
Arithmetic derivative 500 42 Number-Theory, Functions
Administrative function 900 9
Tricky 400 61 Number-Theory
Concetric 200 63 Geometry
NRD pair 200 93 Number-Theory, Prime-Numbers
Tommorow's day 100 642 Algebra, Digits
Switchers 400 44 Combinatorics, Sets
Interesting permutations 600 5 Number-Theory
MTMTK System 400 21 Algebra, Equations
!Fancy sequence 600 8 Combinatorics, Number-Theory
Square multiples of 24 200 228
VNT 500 97 Number-Theory, LTE
Small triangle 600 15 Geometry, Areas
Equilateral Triangles 200 210 Combinatorics, Grids
More dominos 400 31 Combinatorics
Zeros and Ones 300 22 Combinatorics
Sharingan 500 10 Geometry
2+1 200 246 Algebra, Arithmetics
Cool-divisble numbers 300 64 Number-Theory, Digits
Integer sequence 400 13 Algebra, Sequences
Probability computer 300 33 Combinatorics
U turn 200 145 Algebra, Number-Theory, Digits
Powered Numbers (Duplicate) 300 50 Algebra, Number-Theory
Rational Irrational 300 32 Algebra, Number-Theory
Fractions 300 112 Algebra
Numbers ratio 100 590 Algebra, Arithmetics
Digital Cubes 100 87 Algebra, Digits
Semiperimeter 200 42 Geometry
Gineq 300 49 Geometry
Sum of Digits 200 69 Number-Theory, Digits
ADAD (Duplicate) 400 40 Geometry, Circles
Max Area 300 37 Geometry
Difference of squares 200 47 Combinatorics, Number-Theory
Big set 400 15 Combinatorics
Small triangular numbers 200 132 Algebra, Number-Theory
Permutational Polynomial 500 32 Algebra
Expanding brackets 300 146 Algebra, Polynomials
New Cake 400 26 Geometry
Sequenta 300 66 Algebra, Sequences
Uneven numbers 100 120 Number-Theory
Four equal angles 200 69 Geometry
Bools and cows 200 159 Random, Combinatorics
Simple Altai 400 18 Number-Theory
Interesting functions 600 12 Number-Theory
Subsets Collection 600 27 Combinatorics, Sets
Mathrix 600 5 Algebra, Number-Theory, Matrices
Sum of Squares 500 24 Geometry
Area of triangle 200 200 Geometry, Squares, Areas
Sum of digits 2020 200 151 Number-Theory, Digits
Divisible sets 300 6 Combinatorics
Random numbers 400 17 Algebra, Combinatorics
Smallest fraction 300 23 Algebra, Number-Theory
Four on a circle 400 43 Geometry, Circles
Fancy meal 300 75
Fancy limit 400 31 Algebra, Sequences
Powered Numbers 300 51 Algebra, Number-Theory
Base4 300 30 Number-Theory
Rational Polynomial 400 25 Algebra, Polynomials
Half Integers 500 2 Combinatorics, Geometry
Fancy point 500 11 Geometry
Irreducible Fractions 200 79 Number-Theory
Point O 400 98 Geometry
Random answer 100 455 Random
0,1,2 polynomial 400 20 Combinatorics, Algebra
Smallest degree 400 10 Algebra, Polynomials
!Fancy grid 700 9 Combinatorics, Graphs
Money date 100 314 Combinatorics, Probabilities
Weird equation 200 195 Algebra, Polynomials
Polynomial Probability 600 27
Regular Polygons 200 50 Geometry, Combinatorics
Nice polynomial 700 7 Algebra
Fill the square 400 16 Combinatorics, Algebra
Hexagonial 300 10 Geometry, Hexagons
Sum probability 300 78 Combinatorics, Algebra, Probablilities
Cemicirlces 300 16 Geometry, Areas
!Fancy cubic 300 66 Algebra, Number-Theory
Soccer Game 500 11 Combinatorics
Lin's Numbers 400 30 Number-Theory, Algebra
Temirlan's cake 100 733 Algebra, Arithmetics
Rotating Hexagon 600 3 Geometry, Combinatorics
Just Easy Sum 100 138 Algebra
Fancy integral 700 32 Algebra, Sums, Integrals
Revolution 300 20 Combinatorics
Not fibbo 300 54 Algebra, Sequences
6-sums 100 111 Algebra
Binary Sum 500 26 Number-Theory, Algebra
Concatenate 500 15 Number-Theory
Odd polynomial 400 103 Algebra, Polynomials
Function 300 194 Algebra, Functional-Equations
ADAD 400 37 Geometry, Circles
Math lesson 400 40 Number-Theory, Combinatorics
Smallest number 600 243 Algebra
Cube Cube Square 300 26 Algebra, Number-Theory
Solutions on the interval 300 56 Algebra, Equations
Factorial Factor 200 59 Number-Theory, Combinatorics
5th power equation 500 63 Algebra, Equations
MathForces Store 500 32 Combinatorics
Lucky numbers 100 146 Digits, Algebra
Five Primes 100 128 Number-Theory
Infinite game 500 41 Combinatorics, Games
Not constant 300 25 Algebra, Number-Theory
Sharp inequality 500 10 Algebra, Inequalities
Weird games 500 20 Combinatorics
Sequence 300 44 Number-Theory
Cyclic Q 600 16 Geometry
Where is my husband 500 23 Combinatorics, True-False
Triangle and Square 200 61 Geometry
These Triangles 300 19 Geometry, Combinatorics
Cyclic Areas 300 26 Geometry, Areas
Quadratic 300 46 Algebra, Number-Theory
5 instead of 1 200 179
Minimizing Fibb 400 120 Algebra, Sequences
Independence 300 10 Combinatorics, Probabilities
D Flags 200 72 Web-Search
New FE 300 49 Functional-Equations
Rooks 600 16 Combinatorics
Obtuser 400 19 Combinatorics, Geometry
Maximum of Minimum 500 27 Algebra, Inequalities
Hold me 500 19 Algebra
Diameter 400 53 Geometry, Perpendiculars
Pentagon 500 17 Geometry, Combinatorics, Pentagons
Magic Ruler 500 6 Geometry, Combinatorics
Poly 600 10 Algebra
Cuboid 300 26 Number-Theory
Friends Playing 600 18 Combinatorics
Novirus 300 81 Combinatorics, Graphs
Flights 500 9 Combinatorics, Graphs
Unordered triplet 300 49 Algebra, Number-Theory
!Fancy FE 500 9 Algebra, Polynomials
Quadratic Sets 400 8 Combinatorics, Sets, Algebra
Parking 300 186 Combinatorics
Chords 300 10 Geometry, Circles
Tan-Sin 500 39 Geometry, Trigonometry
Flip 200 64 Algebra, Number-Theory, Digits
Teleporting button 300 16 Combinatorics, Probabilities
!Fancy polygon 400 38 Geometry, 3D
Prime Sets 500 8 Combinatorics, Number-Theory
Half of Octahedron 400 123 Combinatorics, Graphs
School Clubs 500 3 Combinatorics
Fancy polynomial 800 20 Algebra, Polynomials
Daniyar's Friends 300 28
Discriminant 400 34 Algebra, Polynomials
Too much 600 27 Algebra, Equations
Lin's Octagon 300 44 Combinatorics
Nice Integer 400 5 Number-Theory, Algebra, Polynomials
Monochromatics 400 5 Combinatorics, Graphs
Unfair Game 400 31 Combinatorics
6 Apart 500 86 Geometry, 3D
Product of areas 300 40 Geometry
Friendly Team 400 12 Combinatorics
Air MF 500 6 Combinatorics
Equiangular Hexagon 400 11
Ordered papers 300 34 Combinatorics