MathForces: Math Olympiads
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Geometry Algebra Digits Linear-Algebra Matrices Combinatorics Inequalities Number-Theory Squares Perpendiculars Divisors Equations Prime-Numbers Raccoon Formulas Number-theory Polynomials Sequences Coordinates Powers Circles Tangents Floor-Function Probabilities Arithmetics Palindromes Functions Sums Complex-Numbers Graphs Chess Sets Games Angle-Chasing LTE Functional-Equations True-False Grids Exponents Trigonometry Random Areas Probablilities Web-Search Boards Integrals Pentagons Hexagons 3D

All problems:


Name сортировать Difficulty сортировать Users
Solved сортировать		 Tags сортировать
Test 100 946
Inverse Sum in Triangle 500 11 Geometry
2020 digit 200 544 Algebra, Digits
Oh-matrix 300 153 Algebra, Linear-Algebra, Matrices
Regular Polygons 200 53 Geometry, Combinatorics
Product of differences 300 129 Algebra, Inequalities
!Fancy sequence 600 8 Combinatorics, Number-Theory
Special square 500 56 Number-Theory, Squares
Viet said 500 111 Number-Theory
Sum of four 100 458 Combinatorics, Digits
Sharingan 500 11 Geometry
Diameter 400 54 Geometry, Perpendiculars
Odd divisors 300 94 Number-Theory, Divisors
Positive product of sums 300 77 Algebra, Equations, Number-Theory
Relatively prime with 2020 200 251 Number-Theory, Prime-Numbers
Lin the Racoon's Debut 600 18 Combinatorics, Raccoon
C Sum 300 127 Algebra, Combinatorics, Formulas
Convex triangle 400 39 Geometry, Combinatorics
Powers of 6 500 41 Number-theory, Equations
Fancy point 500 11 Geometry
Similar polynomials 500 53 Algebra, Polynomials
All such 400 69 Number-Theory, Equations
Divisibility by 4 200 241 Number-Theory, Digits
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
Lin does shopping 200 30 Algebra, Number-Theory
335577 500 36 Number-Theory, Powers
Many digits 400 112 Algebra
Also palindrome 400 46 Digits
First geometry 400 63 Geometry, Circles, Tangents
Unfair Game 400 31 Combinatorics
x[x] 400 62 Number-Theory, Floor-Function
Money date 100 347 Combinatorics, Probabilities
Friendly Team 400 12 Combinatorics
Prime Sets 500 8 Combinatorics, Number-Theory
2+1 200 270 Algebra, Arithmetics
2020 Palindromes 100 408 Combinatorics, Palindromes
Progressive sequence 500 18 Algebra, Number-Theory, Sequences
Naruto cubed 300 0
Binary polindromes 300 8
Love Triangle 400 6 Combinatorics
Right Square 300 0
What a function 400 38 Algebra, Functions
Simple sum 300 31 Algebra, Sums
Tricky polynomial 600 48 Algebra, Polynomials, Complex-Numbers
Number Coloring 400 23 Combinatorics
Lin's Numbers 400 33 Number-Theory, Algebra
Odd factors 500 27
Rooks 600 16 Combinatorics
Bingo! 200 164 Combinatorics, Probabilities
Almost squared numbers 300 49 Number-Theory
Nice polynomial 700 7 Algebra
Just sequence 300 156 Algebra, Sequences
Nice Integer 400 5 Number-Theory, Algebra, Polynomials
P5 300 0
Good Order 600 3 Algebra, Number-Theory
Half of Octahedron 400 123 Combinatorics, Graphs
Exactly two roots 400 51 Number-Theory, Equations
Fancy limit 400 31 Algebra, Sequences
Prime powers 400 38
Friendly rooks 200 172 Combinatorics, Chess
Teleporting button 300 19 Combinatorics, Probabilities
Sqaure in square 600 39 Geometry, Squares
Lin Jumper 500 15 Combinatorics
Orthocenter 600 12 Geometry, Circles, Tangents
Circled 700 13 Geometry, Combinatorics
Zero sequence 200 77 Algebra, Sequences
Probability computer 300 40 Combinatorics
Arithmetic derivative 500 43 Number-Theory, Functions
Novirus 300 83 Combinatorics, Graphs
NRD pair 200 99 Number-Theory, Prime-Numbers
Tricky 400 61 Number-Theory
Squared fours 200 212 Number-Theory, Algebra
Interesting functions 600 12 Number-Theory
Switchers 400 44 Combinatorics, Sets
Concetric 200 70 Geometry
One three-digit number 200 267 Algebra, Inequalities
MTMTK System 400 21 Algebra, Equations
Infinite game 500 42 Combinatorics, Games
Checkboard 600 3 Combinatorics
!Fancy grid 700 9 Combinatorics, Graphs
Angle chasing 300 136 Geometry, Angle-Chasing
VNT 500 99 Number-Theory, LTE
More dominos 400 31 Combinatorics
Daniyar's Friends 300 28
Functional Eq 700 16 Algebra, Functional-Equations
Permutational Polynomial 500 33 Algebra
Where is my husband 500 23 Combinatorics, True-False
Magic Ruler 500 7 Geometry, Combinatorics
Equilateral Triangles 200 222 Combinatorics, Grids
Tommorow's day 100 683 Algebra, Digits
Concatenate 500 15 Number-Theory
Powered Numbers (Duplicate) 300 52 Algebra, Number-Theory
Cubical squares 100 658 Algebra, Exponents
Fractions 300 121 Algebra
Tan-Sin 500 39 Geometry, Trigonometry
Bools and cows 200 170 Random, Combinatorics
Cyclic Q 600 16 Geometry
Max Area 300 39 Geometry
Triangle in Hexagon 200 58 Geometry, Probabilities
ADAD (Duplicate) 400 40 Geometry, Circles
Rotating Hexagon 600 3 Geometry, Combinatorics
Sequenta 300 70 Algebra, Sequences
5th power equation 500 63 Algebra, Equations
Numbers ratio 100 629 Algebra, Arithmetics
Digital Cubes 100 105 Algebra, Digits
Four equal angles 200 79 Geometry
U turn 200 151 Algebra, Number-Theory, Digits
Big set 400 15 Combinatorics
Expanding brackets 300 150 Algebra, Polynomials
Semiperimeter 200 42 Geometry
Subsets Collection 600 27 Combinatorics, Sets
Air MF 500 6 Combinatorics
Simple expression 300 85 Algebra, Combinatorics
New Cake 400 29 Geometry
Sum of Squares 500 24 Geometry
Rational Irrational 300 34 Algebra, Number-Theory
Excirlce 400 3 Geometry
Simple Altai 400 21 Number-Theory
Area of triangle 200 211 Geometry, Squares, Areas
Half Integers 500 2 Combinatorics, Geometry
Four on a circle 400 43 Geometry, Circles
Rational Polynomial 400 25 Algebra, Polynomials
Small triangular numbers 200 138 Algebra, Number-Theory
Difference of squares 200 56 Combinatorics, Number-Theory
Sharp inequality 500 10 Algebra, Inequalities
Base4 300 33 Number-Theory
Powered Numbers 300 51 Algebra, Number-Theory
Irreducible Fractions 200 89 Number-Theory
Random numbers 400 18 Algebra, Combinatorics
Random answer 100 486 Random
Gineq 300 54 Geometry
Integer sequence 400 13 Algebra, Sequences
Friends Playing 600 18 Combinatorics
Zeros and Ones 300 26 Combinatorics
Square multiples of 24 200 233
Polynomial Probability 600 27
Divisible sets 300 6 Combinatorics
Smallest fraction 300 28 Algebra, Number-Theory
0,1,2 polynomial 400 21 Combinatorics, Algebra
Fill the square 400 16 Combinatorics, Algebra
Uneven numbers 100 158 Number-Theory
Ordered papers 300 34 Combinatorics
Sum probability 300 84 Combinatorics, Algebra, Probablilities
Point O 400 98 Geometry
D Flags 200 74 Web-Search
Just Easy Sum 100 163 Algebra
Solutions on the interval 300 60 Algebra, Equations
Cool-divisble numbers 300 69 Number-Theory, Digits
Seven eleven 200 64 Algebra
Sum of digits 2020 200 155 Number-Theory, Digits
Sum of Digits 200 74 Number-Theory, Digits
6-sums 100 132 Algebra
Not fibbo 300 57 Algebra, Sequences
!Fancy cubic 300 68 Algebra, Number-Theory
Hold me 500 21 Algebra
Binary Sum 500 27 Number-Theory, Algebra
Temirlan's cake 100 778 Algebra, Arithmetics
Math lesson 400 42 Number-Theory, Combinatorics
Fancy meal 300 76
Smallest degree 400 11 Algebra, Polynomials
Lucky numbers 100 161 Digits, Algebra
Soccer Game 500 11 Combinatorics
Odd polynomial 400 103 Algebra, Polynomials
Cube Cube Square 300 28 Algebra, Number-Theory
Five Primes 100 158 Number-Theory
Almost fixed 400 14 Combinatorics, Algebra
ADAD 400 37 Geometry, Circles
Mathrix 600 5 Algebra, Number-Theory, Matrices
Again these rooks 600 58 Combinatorics, Boards
Cyclic Areas 300 28 Geometry, Areas
School Clubs 500 3 Combinatorics
Factorial Factor 200 65 Number-Theory, Combinatorics
Triangle and Square 200 68 Geometry
Quadratic 300 51 Algebra, Number-Theory
Fancy integral 700 32 Algebra, Sums, Integrals
Fancy polynomial 800 20 Algebra, Polynomials
Quadratic Sets 400 9 Combinatorics, Sets, Algebra
Maximum of Minimum 500 27 Algebra, Inequalities
New FE 300 52 Functional-Equations
Not constant 300 28 Algebra, Number-Theory
Revolution 300 23 Combinatorics
5 instead of 1 200 185
Lin's Octagon 300 45 Combinatorics
Pentagon 500 17 Geometry, Combinatorics, Pentagons
Cemicirlces 300 21 Geometry, Areas
Function 300 203 Algebra, Functional-Equations
Cuboid 300 28 Number-Theory
Sequence 300 46 Number-Theory
Poly 600 10 Algebra
Flights 500 9 Combinatorics, Graphs
!Fancy FE 500 9 Algebra, Polynomials
These Triangles 300 22 Geometry, Combinatorics
Hexagonial 300 14 Geometry, Hexagons
Flip 200 65 Algebra, Number-Theory, Digits
Minimizing Fibb 400 121 Algebra, Sequences
Pencils 400 7 Combinatorics
Weird equation 200 210 Algebra, Polynomials
Smallest number 600 244 Algebra
Chords 300 12 Geometry, Circles
Unordered triplet 300 54 Algebra, Number-Theory
Negative roots 300 38 Algebra
Not your business 200 192 Geometry, Tangents
Independence 300 10 Combinatorics, Probabilities
Small triangle 600 15 Geometry, Areas
Interesting permutations 600 6 Number-Theory
Too much 600 27 Algebra, Equations
Reverse Product 400 36 Combinatorics, Number-Theory
Parking 300 191 Combinatorics
Weird games 500 20 Combinatorics
Discriminant 400 35 Algebra, Polynomials
Monochromatics 400 6 Combinatorics, Graphs
Total inversion 500 31 Combinatorics, Geometry
Product of areas 300 42 Geometry
6 Apart 500 89 Geometry, 3D
Lin's Game 400 9 Combinatorics, Games
Obtuser 400 19 Combinatorics, Geometry
MathForces Store 500 32 Combinatorics
Administrative function 900 9
Equiangular Hexagon 400 11
!Fancy polygon 400 38 Geometry, 3D