Задачи

Sphere#1969

Многу тешко · Graphs · Shortest paths

David Copperfield is resting#1970

Многу лесно · Implementation

Fateful Chess Puzzle#1971

Многу лесно · Combinatorics

Splitting#1972

Средно · Number theory

Rollback#1973

Многу лесно · Segment Tree · Prefix Sums · Queries

Random Acts of Kindness Day#1974

Многу лесно · Math · Implementation

The tightly bound son of the mountains#1975

Тешко · Graphs · Shortest paths

Programming is an art!#1976

Многу тешко · Greedy algorithms

Organizational Problems: A Topic for a Dissertation?#1978

Лесно · Graphs · Graph network flows

Railroad#1979

Средно · Graphs · Depth-first Search · Graph matchings

Shadow Protocol#1980

Многу лесно · Chinese remainder theorem

Mushroom#1981

Многу лесно · Dynamic programming

Highways#1982

Средно · Graphs

Ricefield#1983

Многу лесно · Implementation

Fractions#1984

Лесно · Math · Combinatorics

Primes Anna#1985

Средно · Number theory · Implementation

Anna and the palindrome#1986

Средно · Strings · Brute force

The Next Permutation#1987

Многу лесно · Implementation

The largest increasing subsequence#1988

Лесно · Dynamic programming

Maximum matching#1989

Средно · Graph matchings · Graphs · Breadth-first Search · Depth-first Search

Domino 2#1990

Многу лесно · Graphs

Maximum flow#1991

Многу лесно · Graphs

Dividing the graph#1992

Лесно · Graphs

Weighing#1993

Многу лесно · Math

1926-1950 од 9226