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

All problems:


Name сортировать Difficulty сортировать Users
Solved сортировать		 Tags сортировать
Test 100 932
These Triangles 300 22 Geometry, Combinatorics
Magic Ruler 500 7 Geometry, Combinatorics
Weird games 500 20 Combinatorics
Oh-matrix 300 153 Algebra, Linear-Algebra, Matrices
2020 digit 200 537 Algebra, Digits
Weird equation 200 208 Algebra, Polynomials
Fancy meal 300 76
Lin's Numbers 400 33 Number-Theory, Algebra
Product of differences 300 126 Algebra, Inequalities
Special square 500 56 Number-Theory, Squares
Viet said 500 111 Number-Theory
Sum of four 100 454 Combinatorics, Digits
Odd divisors 300 93 Number-Theory, Divisors
Positive product of sums 300 76 Algebra, Equations, Number-Theory
Nice Integer 400 5 Number-Theory, Algebra, Polynomials
Relatively prime with 2020 200 249 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
Lin does shopping 200 30 Algebra, Number-Theory
Powers of 6 500 41 Number-theory, Equations
!Fancy grid 700 9 Combinatorics, Graphs
Similar polynomials 500 53 Algebra, Polynomials
All such 400 69 Number-Theory, Equations
Polynomial without 4 400 43 Algebra, Polynomials
Tricky sequence 500 30 Number-Theory, Algebra, Sequences
Cyclic Q 600 16 Geometry
Divisibility by 4 200 240 Number-Theory, Digits
P1 300 0
Triangle in hyperbola 400 63 Algebra, Geometry, Coordinates
Prime Sets 500 8 Combinatorics, Number-Theory
335577 500 36 Number-Theory, Powers
Many digits 400 112 Algebra
Bools and cows 200 169 Random, Combinatorics
Seven eleven 200 64 Algebra
First geometry 400 63 Geometry, Circles, Tangents
x[x] 400 62 Number-Theory, Floor-Function
2+1 200 268 Algebra, Arithmetics
Tan-Sin 500 39 Geometry, Trigonometry
2020 Palindromes 100 405 Combinatorics, Palindromes
Progressive sequence 500 18 Algebra, Number-Theory, Sequences
Naruto cubed 300 0
Binary polindromes 300 8
Air MF 500 6 Combinatorics
Right Square 300 0
What a function 400 38 Algebra, Functions
Tricky polynomial 600 48 Algebra, Polynomials, Complex-Numbers
Simple sum 300 31 Algebra, Sums
Odd factors 500 27
Parking 300 191 Combinatorics
Bingo! 200 164 Combinatorics, Probabilities
Small triangle 600 15 Geometry, Areas
Almost squared numbers 300 49 Number-Theory
Just sequence 300 154 Algebra, Sequences
P5 300 0
Rooks 600 16 Combinatorics
Unfair Game 400 31 Combinatorics
Exactly two roots 400 51 Number-Theory, Equations
Prime powers 400 38
Friendly rooks 200 172 Combinatorics, Chess
Sqaure in square 600 39 Geometry, Squares
Functional Eq 700 16 Algebra, Functional-Equations
Inverse Sum in Triangle 500 11 Geometry
Orthocenter 600 12 Geometry, Circles, Tangents
Zero sequence 200 77 Algebra, Sequences
Obtuser 400 19 Combinatorics, Geometry
Permutational Polynomial 500 33 Algebra
Arithmetic derivative 500 43 Number-Theory, Functions
NRD pair 200 98 Number-Theory, Prime-Numbers
Pencils 400 7 Combinatorics
Squared fours 200 212 Number-Theory, Algebra
Tricky 400 61 Number-Theory
Lin's Game 400 9 Combinatorics, Games
Switchers 400 44 Combinatorics, Sets
Friendly Team 400 12 Combinatorics
Concetric 200 70 Geometry
Friends Playing 600 18 Combinatorics
MTMTK System 400 21 Algebra, Equations
One three-digit number 200 266 Algebra, Inequalities
Angle chasing 300 136 Geometry, Angle-Chasing
!Fancy sequence 600 8 Combinatorics, Number-Theory
VNT 500 99 Number-Theory, LTE
More dominos 400 31 Combinatorics
Money date 100 341 Combinatorics, Probabilities
Triangle in Hexagon 200 58 Geometry, Probabilities
Love Triangle 400 6 Combinatorics
Half of Octahedron 400 123 Combinatorics, Graphs
Semiperimeter 200 42 Geometry
Powered Numbers (Duplicate) 300 52 Algebra, Number-Theory
Tommorow's day 100 678 Algebra, Digits
Concatenate 500 15 Number-Theory
Cubical squares 100 652 Algebra, Exponents
Fractions 300 121 Algebra
Equilateral Triangles 200 222 Combinatorics, Grids
Hold me 500 21 Algebra
Total inversion 500 31 Combinatorics, Geometry
Big set 400 15 Combinatorics
Max Area 300 39 Geometry
ADAD (Duplicate) 400 40 Geometry, Circles
Flights 500 9 Combinatorics, Graphs
Gineq 300 54 Geometry
Sequenta 300 70 Algebra, Sequences
Digital Cubes 100 101 Algebra, Digits
Daniyar's Friends 300 28
Interesting functions 600 12 Number-Theory
U turn 200 151 Algebra, Number-Theory, Digits
Numbers ratio 100 621 Algebra, Arithmetics
Four equal angles 200 78 Geometry
Lin's Octagon 300 45 Combinatorics
Sum of Squares 500 24 Geometry
Expanding brackets 300 150 Algebra, Polynomials
Subsets Collection 600 27 Combinatorics, Sets
Simple expression 300 85 Algebra, Combinatorics
New Cake 400 28 Geometry
Where is my husband 500 23 Combinatorics, True-False
Administrative function 900 9
Rational Irrational 300 34 Algebra, Number-Theory
Simple Altai 400 21 Number-Theory
Area of triangle 200 210 Geometry, Squares, Areas
Diameter 400 54 Geometry, Perpendiculars
Four on a circle 400 43 Geometry, Circles
Difference of squares 200 55 Combinatorics, Number-Theory
Powered Numbers 300 51 Algebra, Number-Theory
Rational Polynomial 400 25 Algebra, Polynomials
Small triangular numbers 200 138 Algebra, Number-Theory
Base4 300 33 Number-Theory
Irreducible Fractions 200 89 Number-Theory
Random numbers 400 18 Algebra, Combinatorics
Random answer 100 483 Random
Rotating Hexagon 600 3 Geometry, Combinatorics
Integer sequence 400 13 Algebra, Sequences
Smallest fraction 300 28 Algebra, Number-Theory
Square multiples of 24 200 233
Solutions on the interval 300 60 Algebra, Equations
Cool-divisble numbers 300 69 Number-Theory, Digits
0,1,2 polynomial 400 21 Combinatorics, Algebra
Zeros and Ones 300 26 Combinatorics
Divisible sets 300 6 Combinatorics
Polynomial Probability 600 27
Uneven numbers 100 154 Number-Theory
Fill the square 400 16 Combinatorics, Algebra
Sum probability 300 84 Combinatorics, Algebra, Probablilities
Independence 300 10 Combinatorics, Probabilities
Point O 400 98 Geometry
Just Easy Sum 100 160 Algebra
Sum of Digits 200 74 Number-Theory, Digits
6-sums 100 130 Algebra
D Flags 200 74 Web-Search
Cemicirlces 300 21 Geometry, Areas
Not fibbo 300 57 Algebra, Sequences
Sum of digits 2020 200 155 Number-Theory, Digits
!Fancy cubic 300 68 Algebra, Number-Theory
Cube Cube Square 300 28 Algebra, Number-Theory
Temirlan's cake 100 772 Algebra, Arithmetics
Good Order 600 3 Algebra, Number-Theory
Math lesson 400 42 Number-Theory, Combinatorics
Binary Sum 500 27 Number-Theory, Algebra
Five Primes 100 156 Number-Theory
Lucky numbers 100 159 Digits, Algebra
Novirus 300 83 Combinatorics, Graphs
Smallest degree 400 10 Algebra, Polynomials
Probability computer 300 39 Combinatorics
Odd polynomial 400 103 Algebra, Polynomials
Soccer Game 500 11 Combinatorics
Again these rooks 600 58 Combinatorics, Boards
Interesting permutations 600 6 Number-Theory
Quadratic Sets 400 9 Combinatorics, Sets, Algebra
Mathrix 600 5 Algebra, Number-Theory, Matrices
ADAD 400 37 Geometry, Circles
Teleporting button 300 19 Combinatorics, Probabilities
Factorial Factor 200 65 Number-Theory, Combinatorics
Triangle and Square 200 68 Geometry
Lin Jumper 500 15 Combinatorics
Quadratic 300 51 Algebra, Number-Theory
Fancy integral 700 32 Algebra, Sums, Integrals
5th power equation 500 63 Algebra, Equations
New FE 300 52 Functional-Equations
5 instead of 1 200 185
Maximum of Minimum 500 27 Algebra, Inequalities
Not constant 300 28 Algebra, Number-Theory
Excirlce 400 3 Geometry
Revolution 300 22 Combinatorics
Pentagon 500 17 Geometry, Combinatorics, Pentagons
Reverse Product 400 36 Combinatorics, Number-Theory
Poly 600 10 Algebra
Sequence 300 46 Number-Theory
Sharp inequality 500 10 Algebra, Inequalities
Function 300 203 Algebra, Functional-Equations
Cuboid 300 27 Number-Theory
!Fancy FE 500 9 Algebra, Polynomials
School Clubs 500 3 Combinatorics
Hexagonial 300 14 Geometry, Hexagons
Also palindrome 400 46 Digits
Flip 200 65 Algebra, Number-Theory, Digits
Nice polynomial 700 7 Algebra
Half Integers 500 2 Combinatorics, Geometry
Minimizing Fibb 400 121 Algebra, Sequences
Smallest number 600 244 Algebra
Negative roots 300 38 Algebra
Infinite game 500 42 Combinatorics, Games
Chords 300 12 Geometry, Circles
Not your business 200 192 Geometry, Tangents
Unordered triplet 300 54 Algebra, Number-Theory
Cyclic Areas 300 28 Geometry, Areas
Discriminant 400 35 Algebra, Polynomials
Too much 600 27 Algebra, Equations
Almost fixed 400 14 Combinatorics, Algebra
Regular Polygons 200 53 Geometry, Combinatorics
Number Coloring 400 23 Combinatorics
Ordered papers 300 34 Combinatorics
Monochromatics 400 6 Combinatorics, Graphs
MathForces Store 500 32 Combinatorics
Checkboard 600 3 Combinatorics
Fancy limit 400 31 Algebra, Sequences
Circled 700 13 Geometry, Combinatorics
Product of areas 300 42 Geometry
6 Apart 500 89 Geometry, 3D
Sharingan 500 11 Geometry
Equiangular Hexagon 400 11
!Fancy polygon 400 38 Geometry, 3D
Fancy point 500 11 Geometry
Fancy polynomial 800 20 Algebra, Polynomials