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

All problems:


Name сортировать Difficulty сортировать Users
Solved сортировать		 Tags сортировать
2020 digit 200 526 Algebra, Digits
Fancy limit 400 31 Algebra, Sequences
Test 100 900
Daniyar's Friends 300 28
Rotating Hexagon 600 3 Geometry, Combinatorics
Inverse Sum in Triangle 500 11 Geometry
Oh-matrix 300 151 Algebra, Linear-Algebra, Matrices
Air MF 500 6 Combinatorics
Sum of four 100 444 Combinatorics, Digits
Product of differences 300 125 Algebra, Inequalities
Special square 500 56 Number-Theory, Squares
Administrative function 900 9
Money date 100 337 Combinatorics, Probabilities
Pencils 400 7 Combinatorics
Viet said 500 110 Number-Theory
Lin does shopping 200 30 Algebra, Number-Theory
C Sum 300 124 Algebra, Combinatorics, Formulas
Relatively prime with 2020 200 244 Number-Theory, Prime-Numbers
Permutational Polynomial 500 33 Algebra
Lin the Racoon's Debut 600 18 Combinatorics, Raccoon
Odd divisors 300 91 Number-Theory, Divisors
Convex triangle 400 39 Geometry, Combinatorics
Positive product of sums 300 75 Algebra, Equations, Number-Theory
Powers of 6 500 40 Number-theory, Equations
Seven eleven 200 64 Algebra
Similar polynomials 500 53 Algebra, Polynomials
Interesting functions 600 12 Number-Theory
All such 400 68 Number-Theory, Equations
Polynomial without 4 400 43 Algebra, Polynomials
Tricky sequence 500 30 Number-Theory, Algebra, Sequences
Divisibility by 4 200 236 Number-Theory, Digits
P1 300 0
Triangle in hyperbola 400 63 Algebra, Geometry, Coordinates
Nice polynomial 700 7 Algebra
First geometry 400 61 Geometry, Circles, Tangents
Many digits 400 111 Algebra
x[x] 400 58 Number-Theory, Floor-Function
335577 500 35 Number-Theory, Powers
Teleporting button 300 18 Combinatorics, Probabilities
Simple sum 300 31 Algebra, Sums
2020 Palindromes 100 396 Combinatorics, Palindromes
Progressive sequence 500 18 Algebra, Number-Theory, Sequences
Naruto cubed 300 0
Binary polindromes 300 8
Right Square 300 0
What a function 400 38 Algebra, Functions
Tricky polynomial 600 47 Algebra, Polynomials, Complex-Numbers
Friendly Team 400 12 Combinatorics
Fancy polynomial 800 20 Algebra, Polynomials
Odd factors 500 27
!Fancy sequence 600 8 Combinatorics, Number-Theory
Almost squared numbers 300 49 Number-Theory
These Triangles 300 22 Geometry, Combinatorics
Just sequence 300 152 Algebra, Sequences
P5 300 0
Bingo! 200 162 Combinatorics, Probabilities
Exactly two roots 400 50 Number-Theory, Equations
Friendly rooks 200 167 Combinatorics, Chess
Where is my husband 500 23 Combinatorics, True-False
Lin Jumper 500 15 Combinatorics
Prime powers 400 38
Unfair Game 400 31 Combinatorics
Sqaure in square 600 39 Geometry, Squares
Orthocenter 600 12 Geometry, Circles, Tangents
Bools and cows 200 165 Random, Combinatorics
5th power equation 500 63 Algebra, Equations
Zero sequence 200 74 Algebra, Sequences
Obtuser 400 19 Combinatorics, Geometry
Lin's Octagon 300 45 Combinatorics
Arithmetic derivative 500 42 Number-Theory, Functions
Tricky 400 61 Number-Theory
Squared fours 200 209 Number-Theory, Algebra
Circled 700 13 Geometry, Combinatorics
NRD pair 200 97 Number-Theory, Prime-Numbers
Switchers 400 44 Combinatorics, Sets
Reverse Product 400 36 Combinatorics, Number-Theory
MTMTK System 400 21 Algebra, Equations
One three-digit number 200 264 Algebra, Inequalities
Total inversion 500 31 Combinatorics, Geometry
Concetric 200 67 Geometry
Cyclic Areas 300 28 Geometry, Areas
Square multiples of 24 200 232
Sharp inequality 500 10 Algebra, Inequalities
!Fancy grid 700 9 Combinatorics, Graphs
More dominos 400 31 Combinatorics
Angle chasing 300 135 Geometry, Angle-Chasing
VNT 500 97 Number-Theory, LTE
Simple expression 300 84 Algebra, Combinatorics
Equilateral Triangles 200 218 Combinatorics, Grids
Excirlce 400 3 Geometry
Semiperimeter 200 42 Geometry
Tommorow's day 100 671 Algebra, Digits
Rational Irrational 300 34 Algebra, Number-Theory
2+1 200 260 Algebra, Arithmetics
Cubical squares 100 646 Algebra, Exponents
Powered Numbers (Duplicate) 300 51 Algebra, Number-Theory
Also palindrome 400 46 Digits
Fractions 300 118 Algebra
Monochromatics 400 6 Combinatorics, Graphs
Zeros and Ones 300 25 Combinatorics
Gineq 300 51 Geometry
Number Coloring 400 22 Combinatorics
Tan-Sin 500 39 Geometry, Trigonometry
Big set 400 15 Combinatorics
ADAD (Duplicate) 400 40 Geometry, Circles
Max Area 300 39 Geometry
Love Triangle 400 6 Combinatorics
Four equal angles 200 75 Geometry
New Cake 400 27 Geometry
Digital Cubes 100 97 Algebra, Digits
Numbers ratio 100 613 Algebra, Arithmetics
U turn 200 150 Algebra, Number-Theory, Digits
Sequenta 300 69 Algebra, Sequences
Sum of Squares 500 24 Geometry
Fancy meal 300 76
Again these rooks 600 58 Combinatorics, Boards
Subsets Collection 600 27 Combinatorics, Sets
Expanding brackets 300 148 Algebra, Polynomials
Difference of squares 200 51 Combinatorics, Number-Theory
Fancy integral 700 32 Algebra, Sums, Integrals
Simple Altai 400 19 Number-Theory
Hold me 500 20 Algebra
Area of triangle 200 205 Geometry, Squares, Areas
Four on a circle 400 43 Geometry, Circles
Base4 300 33 Number-Theory
Small triangular numbers 200 137 Algebra, Number-Theory
Powered Numbers 300 51 Algebra, Number-Theory
Rational Polynomial 400 25 Algebra, Polynomials
Random numbers 400 17 Algebra, Combinatorics
Sum of Digits 200 73 Number-Theory, Digits
Integer sequence 400 13 Algebra, Sequences
Uneven numbers 100 144 Number-Theory
Solutions on the interval 300 60 Algebra, Equations
0,1,2 polynomial 400 20 Combinatorics, Algebra
Random answer 100 476 Random
Divisible sets 300 6 Combinatorics
Irreducible Fractions 200 87 Number-Theory
Probability computer 300 37 Combinatorics
Smallest fraction 300 27 Algebra, Number-Theory
Polynomial Probability 600 27
Cemicirlces 300 21 Geometry, Areas
Negative roots 300 36 Algebra
Cool-divisble numbers 300 69 Number-Theory, Digits
Fancy point 500 11 Geometry
Fill the square 400 16 Combinatorics, Algebra
Sum probability 300 83 Combinatorics, Algebra, Probablilities
Sharingan 500 11 Geometry
Small triangle 600 15 Geometry, Areas
Just Easy Sum 100 154 Algebra
Concatenate 500 15 Number-Theory
Almost fixed 400 14 Combinatorics, Algebra
Point O 400 98 Geometry
Diameter 400 54 Geometry, Perpendiculars
6-sums 100 125 Algebra
Not fibbo 300 57 Algebra, Sequences
Sum of digits 2020 200 153 Number-Theory, Digits
Interesting permutations 600 6 Number-Theory
Math lesson 400 41 Number-Theory, Combinatorics
Cube Cube Square 300 28 Algebra, Number-Theory
Binary Sum 500 27 Number-Theory, Algebra
Function 300 199 Algebra, Functional-Equations
Temirlan's cake 100 763 Algebra, Arithmetics
!Fancy cubic 300 68 Algebra, Number-Theory
Odd polynomial 400 103 Algebra, Polynomials
Lucky numbers 100 156 Digits, Algebra
Smallest degree 400 10 Algebra, Polynomials
Soccer Game 500 11 Combinatorics
Five Primes 100 148 Number-Theory
Hexagonial 300 14 Geometry, Hexagons
ADAD 400 37 Geometry, Circles
Functional Eq 700 16 Algebra, Functional-Equations
!Fancy polygon 400 38 Geometry, 3D
Cyclic Q 600 16 Geometry
Not constant 300 28 Algebra, Number-Theory
Mathrix 600 5 Algebra, Number-Theory, Matrices
Quadratic Sets 400 9 Combinatorics, Sets, Algebra
Independence 300 10 Combinatorics, Probabilities
Triangle and Square 200 66 Geometry
Quadratic 300 49 Algebra, Number-Theory
5 instead of 1 200 183
Factorial Factor 200 63 Number-Theory, Combinatorics
Weird equation 200 204 Algebra, Polynomials
New FE 300 50 Functional-Equations
Maximum of Minimum 500 27 Algebra, Inequalities
Revolution 300 22 Combinatorics
Regular Polygons 200 53 Geometry, Combinatorics
Rooks 600 16 Combinatorics
School Clubs 500 3 Combinatorics
Minimizing Fibb 400 121 Algebra, Sequences
Poly 600 10 Algebra
Infinite game 500 42 Combinatorics, Games
Pentagon 500 17 Geometry, Combinatorics, Pentagons
Flights 500 9 Combinatorics, Graphs
Cuboid 300 27 Number-Theory
Sequence 300 46 Number-Theory
Checkboard 600 3 Combinatorics
MathForces Store 500 32 Combinatorics
Prime Sets 500 8 Combinatorics, Number-Theory
!Fancy FE 500 9 Algebra, Polynomials
Flip 200 65 Algebra, Number-Theory, Digits
Not your business 200 190 Geometry, Tangents
Lin's Game 400 9 Combinatorics, Games
Chords 300 12 Geometry, Circles
Smallest number 600 244 Algebra
Unordered triplet 300 52 Algebra, Number-Theory
Half of Octahedron 400 123 Combinatorics, Graphs
D Flags 200 74 Web-Search
Too much 600 27 Algebra, Equations
Novirus 300 82 Combinatorics, Graphs
Discriminant 400 34 Algebra, Polynomials
Nice Integer 400 5 Number-Theory, Algebra, Polynomials
Half Integers 500 2 Combinatorics, Geometry
Parking 300 190 Combinatorics
Weird games 500 20 Combinatorics
6 Apart 500 88 Geometry, 3D
Product of areas 300 42 Geometry
Good Order 600 3 Algebra, Number-Theory
Ordered papers 300 34 Combinatorics
Friends Playing 600 18 Combinatorics
Triangle in Hexagon 200 58 Geometry, Probabilities
Lin's Numbers 400 32 Number-Theory, Algebra
Magic Ruler 500 7 Geometry, Combinatorics
Equiangular Hexagon 400 11