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time_limit_ms
int64
title
string
output
string
memory_limit_mb
int64
description
string
examples
sequence
id
int64
year
int64
test_cases
sequence
note
string
type
string
tags
sequence
source
string
qoj_url
string
input
string
problem_label
string
spj_code
string
1,000
Arrow a Row
"For each test case, if the given string cannot be obtained by performing no more than n painting op(...TRUNCATED)
1,024
"Define an “arrow string” as a string that meets the following conditions:\n\n• The length of (...TRUNCATED)
[ [ "4\n>>->>>\n>>>->\n>>>>>\n>->>>>>>\n", "Yes 2\n1 5\n2 5\nNo\nNo\nYes 2\n2 7\n1 5\n" ] ]
0
2,024
[["53\n>->>>>\n>-->>---->-->>>->->->-->>>->--->--->>>-->>>>-->>>>->>>->>---->-->>>----->>>------>>>-(...TRUNCATED)
"For the fourth test case in the example, the painting process is shown below:\n\n$$\n\\ast\\ast\\as(...TRUNCATED)
traditional
[ "Algorithm Basics" ]
The 2024 ICPC Asia Chengdu Regional Contest
https://qoj.ac/contest/1821/problem/9535
"The first line contains a single integer T (1 ≤ T ≤ 10^4), indicating the number of test cases.(...TRUNCATED)
A
2,500
Athlete Welcome Ceremony
"Output $Q$ lines, with the $i$ -th line containing an integer that represents the number of valid c(...TRUNCATED)
1,024
"Chengdu is about to host the 2025 World Games. During the athlete welcome ceremony at the opening e(...TRUNCATED)
[["6 3\na?b??c\n2 2 2\n1 1 1\n1 0 2","3\n1\n1\n"],["6 3\n??????\n2 2 2\n2 3 3\n3 3 3","30\n72\n96\n"(...TRUNCATED)
1
2,024
[["300 100000\nb?ba??a?b???????c???cb??c??c??abab?cb?a??ac????c??a??b??c??bc???c??c?b??abab?bac?????(...TRUNCATED)
"In the first sample, the valid costume arrangements for the first custom-making plan are acbabc, ac(...TRUNCATED)
traditional
[ "DP", "Math" ]
The 2024 ICPC Asia Chengdu Regional Contest
https://qoj.ac/contest/1821/problem/9536
"The first line contains two integers $n$ ( $1\\leq n\\leq300$ ) and $Q$ ( $1\\le Q\\le10^{5}$ ), re(...TRUNCATED)
B
3,000
Closest Derangement
"For each test case, if there are at least $k$ closest derangements, output $n$ positive integers $q(...TRUNCATED)
1,024
"Blackbird has a permutation $p$ of length $n$. He wants to find a derangement $q$ of $p$, which mea(...TRUNCATED)
[ [ "2\n2 2\n2 1\n3 2\n1 2 3\n", "-1\n3 1 2\n" ] ]
2
2,024
[["18\n854 1\n1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32(...TRUNCATED)
"For the first test case, [1, 2] is the only closest derangement, so output $-1$.\n\nFor the second (...TRUNCATED)
traditional
[ "Algorithm Basics", "Math", "Data Structure" ]
The 2024 ICPC Asia Chengdu Regional Contest
https://qoj.ac/contest/1821/problem/9538
"The first line contains an integer $T$ ($1\\le T\\le10^{4}$), representing the number of test cases(...TRUNCATED)
D
2,000
Disrupting Communications
"For each test case, output $q$ lines, each containing the result modulo 998244353 for one of the $q(...TRUNCATED)
1,024
"The enemy has established communication outposts across several locations, which can be represented(...TRUNCATED)
[ [ "2\n3 2\n1 1\n2 3\n1 2\n5 3\n1 1 2 2\n4 5\n2 4\n2 3\n", "6\n5\n14\n13\n15\n" ] ]
3
2,024
[["4\n49229 66495\n1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 (...TRUNCATED)
"In the first case of the example, 6 connected subgraphs can be selected in total. For the first que(...TRUNCATED)
traditional
[ "DP", "Data Structure" ]
The 2024 ICPC Asia Chengdu Regional Contest
https://qoj.ac/contest/1821/problem/9539
"The first line contains a single integer $T$ ( $1\\le T\\le10^{4}$ ), indicating the number of test(...TRUNCATED)
E
6,000
Double 11
"Output one real number, indicating the answer. Your output will be considered correct if the relati(...TRUNCATED)
1,024
"With the Double 11 Shopping Festival approaching, a store is managing its best-selling products for(...TRUNCATED)
[ [ "4 2\n1 2 3 4\n", "6.1911471295571" ], [ "10 3\n1 2 3 4 5 6 7 8 9 10\n", "22.5916253665141" ] ]
4
2,024
[["26348 26347\n46368 41698 42514 72134 3433 10286 81157 71742 86066 61993 23451 37386 39383 94435 4(...TRUNCATED)
"For the first example, let $k_{1} = \\frac{1}{3+\\sqrt{21}}$, $k_{2} = \\frac{1}{7+\\sqrt{21}}$, an(...TRUNCATED)
spj
[ "DP" ]
The 2024 ICPC Asia Chengdu Regional Contest
https://qoj.ac/contest/1821/problem/9540
"The first line contains two integers $n$ and $m$ ($1\\leq m\\leq n\\leq2\\cdot10^{5}$), indicating (...TRUNCATED)
F
"#include <cstdio>\n#include <fstream>\n#include <sstream>\n#include <string>\n#include <cmath>\n#in(...TRUNCATED)
2,000
Expanding Array
"Output a single integer, representing the maximum number of distinct values that can be obtained in(...TRUNCATED)
1,024
"Given an integer array $a_{1},a_{2},\\ldots,a_{n}$ of length $n$, you can perform any number of ope(...TRUNCATED)
[ [ "2\n2 3\n", "4\n" ], [ "2\n3 4\n", "4\n" ] ]
5
2,024
[["2\n934983889 712263209\n","8\n"],["95953\n63767171 525295800 529356864 645135222 611916600 109522(...TRUNCATED)
traditional
[ "Math" ]
The 2024 ICPC Asia Chengdu Regional Contest
https://qoj.ac/contest/1821/problem/9541
"The first line contains a single integer $n$ ($2\\leq n\\leq10^{5}$), representing the length of th(...TRUNCATED)
G
1,000
Friendship is Magic
For each test case, output the answer modulo $10^{9}+7$ in a single line.
1,024
"Rockdu is a pony living in Ponyville. His best friend, Macaronlin, also lives there. Rockdu values (...TRUNCATED)
[ [ "2\n108 112\n114514 1919810", "31\n86328270" ] ]
6
2,024
[["34\n900000006 900000008\n1999993 2000009\n19995 20020\n316290316287 316290316293\n1730171 1730199(...TRUNCATED)
"For the first test case in the sample:\n\n• $f(108)=\\mathrm{min}(|1-8|,|10-8|)=\\mathrm{min}(7,2(...TRUNCATED)
traditional
[ "Math" ]
The 2024 ICPC Asia Chengdu Regional Contest
https://qoj.ac/contest/1821/problem/9542
"The first line contains an integer $T$ ($1 \\le T \\le 1000$), indicating the number of test cases.(...TRUNCATED)
H
1,000
Good Partitions
"For each test case, output $q+1$ lines, representing the number of good partition sizes before any (...TRUNCATED)
1,024
"Lawliet has a sequence of numbers of length $n$, denoted as $a_{1},a_{2},\\ldots,a_{n}$, and he wan(...TRUNCATED)
[ [ "1\n5 2\n4 3 2 6 1\n2 5\n3 5\n", "1\n2\n3\n" ] ]
7
2,024
[["5\n187797 68\n1282195839 1994060629 475784268 1398426695 1688039589 1189963220 234741809 70275557(...TRUNCATED)
"Initially, the only good partition size is $k=1$.\n\nAfter the first modification, the sequence bec(...TRUNCATED)
traditional
[ "Math", "DP" ]
The 2024 ICPC Asia Chengdu Regional Contest
https://qoj.ac/contest/1821/problem/9543
"The first line contains an integer $T$ ( $1\\leq T\\leq10$ ), representing the number of test cases(...TRUNCATED)
I
2,000
Grand Prix of Ballance
"For each test case, output $m$ lines, each containing two integers: $id$ and $x$, where $id$ is the(...TRUNCATED)
1,024
"Ballance is a classic game where players use the keyboard to control a ball through complex structu(...TRUNCATED)
[["3\n3 4 6\n1 2\n2 1 1\n2 2 2\n3 3 2\n2 3 2\n2 1 2\n3 4 8\n1 2\n2 1 1\n2 2 2\n3 3 2\n2 3 2\n2 1 2\n(...TRUNCATED)
8
2,024
[["21\n63884 56377 94823\n3 51714 2684\n2 14194 11311\n1 53372\n2 50300 53372\n2 46718 53372\n3 2979(...TRUNCATED)
traditional
[ "Algorithm Basics", "Data Structure" ]
The 2024 ICPC Asia Chengdu Regional Contest
https://qoj.ac/contest/1821/problem/9544
"The first line contains an integer $T$ ($1\\le T\\le10^{4}$), indicating the number of test cases.\(...TRUNCATED)
J
1,000
Magical Set
"Output a single integer indicating the maximum amount of energy that can be generated, i.e., the ma(...TRUNCATED)
1,024
"You have a magical set that initially contains $n$ distinct integers. You discover that these numbe(...TRUNCATED)
[ [ "3\n2 4 6\n", "3\n" ], [ "6\n2 3 5 6 10 12\n", "3\n" ] ]
9
2,024
[["2\n999991832 999995820\n","11\n"],["1\n3\n","1\n"],["1\n999999986\n","2\n"],["288\n458654472 4604(...TRUNCATED)
traditional
[ "Graph", "Math", "Data Structure" ]
The 2024 ICPC Asia Chengdu Regional Contest
https://qoj.ac/contest/1821/problem/9545
"The first line contains an integer $n$ ( $1\\leq n\\leq300$ ), indicating the number of integers in(...TRUNCATED)
K
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