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Hot problems
CCC '25 J3 - Product Codes
CCC '25 J5 - Connecting Territories
CCC '25 J4 - Sunny Days
Problem
Category
Points
AC %
Users
NOI '17 P1 - Integers
China NOI
20p
21.9%
14
NOI '17 P2 - Queue
China NOI
20p
40.9%
12
NOI '17 P3 - Pool
China NOI
30p
30.6%
6
NOI '17 P4 - Game
China NOI
25p
14.3%
5
NOI '17 P5 - Vegetables
China NOI
25p
70.0%
7
NOI '17 P6 - Magic
China NOI
40p
25.0%
2
NOI '18 P1 - Return
China NOI
17p
25.3%
17
NOI '18 P2 - Inverse
China NOI
25p
15.8%
6
NOI '18 P3 - Name
China NOI
25p
6.2%
4
NOI '19 P1 - Route
China NOI
25p
12.4%
59
NOI '19 P2 - Robot
China NOI
25p
6.5%
8
NOI '19 P3 - Sequence
China NOI
25p
8.7%
13
NOI '19 P4 - Jump
China NOI
25p
13.2%
44
NOI '19 P5 - Landlords
China NOI
25p
21.8%
17
NOI '19 P6 - Explore
China NOI
25p
2.5%
11
NOI '20 P1 - Delicacy
China NOI
25p
13.4%
34
NOI '20 P2 - Destiny
China NOI
25p
16.7%
15
NOI '20 P3 - Tears
China NOI
40p
11.0%
8
NOI '20 P4 - Dish
China NOI
20p
8.5%
24
NOI '20 P5 - Surreal
China NOI
17p
11.5%
20
NOI '20 P6 - Road
China NOI
45p
3.3%
1
NOI '21 P1 - Light Heavy Edges
China NOI
25p
10.0%
30
NOI '21 P2 - Intersecting Paths
China NOI
25p
25.0%
19
NOI '21 P3 - Celebration
China NOI
25p
10.3%
24
NOI '21 P4 - Quantum Communication
China NOI
25p
9.1%
23
NOI '21 P5 - The Locked Box
China NOI
25p
12.8%
10
NOI '21 P6 - Robot Game
China NOI
25p
22.5%
4
NOI '22 P1 - Major
China NOI
25p
6.4%
16
NOI '22 P2 - Stone
China NOI
30p
25.0%
3
NOI '22 P3 - Count
China NOI
40p
0.0%
0
NOI '22 P4 - Challenge NPC
China NOI
25p
30.6%
8
NOI '22 P5 - Bubble Sort
China NOI
35p
3.7%
3
NOI '22 P6 - Quadratic Integer Program
China NOI
40p
0.0%
0
NOI '23 P1 - Square Coloring
China NOI
17p
25.4%
15
NOI '23 P2 - Osmanthus Tree
China NOI
25p
18.4%
7
NOI '23 P3 - Depth First Search
China NOI
35p
27.3%
2
NOI '23 P4 - Trade
China NOI
20p
32.4%
10
NOI '23 P5 - String
China NOI
25p
16.7%
9
NOI '23 P6 - Merge the Books
China NOI
30p
14.3%
3
NOI '97 P1 - Competition Ranking
China NOI
7
31.8%
40
NOI '97 P2 - Optimal Routing
China NOI
7p
26.3%
60
NOI '97 P3 - File Matching
China NOI
25p
2.7%
2
NOI '97 P4 - Perfect Tour
China NOI
5
31.7%
154
NOI '97 P5 - Building Game
China NOI
15p
27.4%
25
NOI '97 P6 - Satellite Coverage
China NOI
12p
36.7%
28
NOI '98 P1 - Personal Income Tax
China NOI
7
55.6%
22
NOI '98 P2 - Free Pizza
China NOI
15p
18.8%
13
NOI '98 P3 - Software Installation Disk
China NOI
15p
42.1%
4
NOI '98 P4 - Scarf Cutting
China NOI
15p
28.8%
10
NOI '98 P5 - SERNET Simulation
China NOI
12p
8.9%
15
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