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Problems

Combinatorics
Difficulty
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719
A Mad Tea Party
Medium
720
Duchess
Medium
730
How many prefix ones?
Very easy
741
Ski Racing
Hard
812
Russian Lotto
Very easy
828
Shooting Range
Very hard
843
Permutation of letters
Very easy
1286
Tuck-shop
1287
Tennis competitions
Very easy
1288
n-digit numbers
Easy
1289
Lunch
Very easy
1290
License plate
Very easy
1325
Vas`kin track
Very easy
1326
Play hockey this...
Very easy
1327
Rooks on a chessboard
Very easy
1328
Drawings on a piece of paper in the box
Easy
1329
Partition of the set
Hard
1440
Beautyful squares
Medium
1478
Rectangle
Hard
1479
Rectangles-1
Hard
1480
Rectangles-2
Very hard
1481
Rectangles-3
Hard
1531
Keys In Boxes
1532
Handshake
Very easy
1533
Anagram generation
Easy
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