My Competitive Programming code

ICPC

I am one of the problem setters of Vietnam ICPC since 2016. Added my reference solutions for some problems here.

Also added some solutions from upsolving other regionals / WFs.

VNOJ

Code for VNOI Online Judge - official OJ in Vietnam.

I livestream solving these problems (in Vietnamese) at my FB page

Codeforces

Codeforces submissions are auto-generated with Harwest.

Only Accepted submissions are included.

All submissions from gyms and virtual contests are here.

#	Title	Solution	Tags	Submitted
3568	D - Shurikens	C++17	greedy *1700	Oct/30/2020
3567	C - Perform Easily	C++17	two pointers *1900	Oct/30/2020
3566	B - A New Technique	C++17	*1100	Oct/30/2020
3565	A - Finding Sasuke	C++17	math *800	Oct/30/2020
3564	E - Make It Increasing	C++17	dp *2200	Oct/30/2020
3563	D - Minimal Height Tree	C++17	trees *1600	Oct/30/2020
3562	C - Chef Monocarp	C++17	sortings *1800	Oct/30/2020
3561	B - Reverse Binary Strings	C++17	greedy *1200	Oct/30/2020
3560	A - Marketing Scheme	C++17	math *800	Oct/30/2020
3559	A - Ahahahahahahahaha	PyPy 3	math *1100	Sep/10/2020
3558	A - Multiples of Length	C++17	number theory *1600	Sep/03/2020
3557	D - Again?	Python 3		Apr/02/2020
3556	B - Limericks	Python 3	math number theory	Apr/02/2020
3555	A - Is it rated?	Python 2		Apr/02/2020
3554	A - Malek Dance Club	C++17	math *1600	Feb/29/2020
3553	E - Binary Numbers AND Sum	C++17	math *1700	Feb/29/2020
3552	D - Polycarp's phone book	C++17	sortings *1600	Feb/29/2020
3551	C - Permutation Cycle	C++17	constructive algorithms *1600	Feb/29/2020
3550	A - Long Beautiful Integer	C++17	strings *1700	Feb/29/2020
3549	B - s-palindrome	Python 3	strings *1600	Feb/29/2020
3548	I - Palindrome Pairs	C++17	strings *1600	Feb/29/2020
3547	A - Multicolored Marbles	C++17	math *1600	Feb/29/2020
3546	D - Minimum Diameter Tree	C++17	trees *1700	Feb/28/2020
3545	B - Three-level Laser	C++17	two pointers *1600	Feb/28/2020
3544	F - Mentors	C++17	data structures *1500	Feb/28/2020
3543	C - Find Maximum	C++17	number theory *1600	Feb/28/2020
3542	C - Save the Nature	C++17	greedy *1600	Feb/28/2020
3541	E - Field of Wonders	C++17	strings *1500	Feb/28/2020
3540	C - Nastya and a Wardrobe	C++17	math *1600	Feb/28/2020
3539	C - Destroying Array	C++17	dsu *1600	Feb/28/2020
3538	A - Win or Freeze	C++17	number theory *1400	Feb/28/2020
3537	D - Union Found	Rust		Feb/10/2020
3536	C - Partial Reduplication	C++17		Feb/10/2020
3535	B - Bogart Gets Disqualified	C++17		Feb/10/2020
3534	A - Vincent Adultman	C++17		Feb/10/2020
3533	C - Product of Three Numbers	Rust	number theory *1300	Feb/08/2020
3532	F - Mega Nim	C++17		Feb/07/2020
3531	C - Floyd	Rust		Feb/07/2020
3530	A - Clothes	C++17		Feb/07/2020
3529	D - Dijkstra	C++17		Feb/05/2020
3528	B - DAG	C++17	constructive algorithms	Feb/04/2020
3527	C - Segment tree or Fenwick?	C++17	data structures	Feb/04/2020
3526	A - Nash equilibrium	C++17		Feb/04/2020
3525	A - Display The Number	Rust	greedy *900	Jan/31/2020
3524	D - Dr. Evil Underscores	Rust	trees *1900	Jan/13/2020
3523	C - Fadi and LCM	Rust	number theory *1400	Jan/13/2020
3522	B - Just Eat It!	Rust	greedy *1300	Jan/13/2020
3521	A - Mezo Playing Zoma	Rust	math *800	Jan/12/2020
3520	A - Water Buying	Rust	math *800	Jan/12/2020
3519	A - Wrong Subtraction	Rust	*800	Jan/12/2020
3518	B - Welfare State	C++17	sortings *1600	Aug/16/2019
3517	D - Vus the Cossack and Numbers	C++17	math *1500	Jun/28/2019
3516	C - Vus the Cossack and Strings	C++17	math *1800	Jun/28/2019
3515	A - Vus the Cossack and a Contest	C++17	*800	Jun/28/2019
3514	E - Fourier Doodles	C++17		Apr/02/2019
3513	F - Neat Words	C++17		Apr/02/2019
3512	C - Mystery Circuit	C++17	bitmasks brute force	Apr/02/2019
3511	B - Kanban Numbers	C++17	brute force	Apr/01/2019
3510	D - Pigeon d'Or	C++17		Apr/01/2019
3509	A - Thanos Sort	C++17		Apr/01/2019
3508	A - A	C++17		Nov/06/2018
3507	E - The Untended Antiquity	Java 8	hashing *2400	Nov/05/2018
3506	A - The Artful Expedient	PyPy 2	brute force *1100	Nov/05/2018
3505	C - Flawed Flow	C++17	greedy *2100	Oct/05/2018
3504	D - Sequence analysis	C++17		May/12/2018
3503	E - Cheese Board	C++11	*2000	Apr/02/2018
3502	D - I'm Feeling Lucky!	C++11	probabilities *1800	Apr/02/2018
3501	C - Ravioli Sort	C++11	*1600	Apr/02/2018
3500	B - A Map of the Cat	C++11	interactive *1900	Apr/02/2018
3499	A - Quirky Quantifiers	C++11	math *800	Apr/02/2018
3498	A - The Meaningless Game	C++11	number theory *1700	Dec/01/2017
3497	L - Send the Fool Further! (hard)	C++	trees *2400	May/28/2017
3496	C - Heidi and Library (hard)	C++11	flows *2600	May/28/2017
3495	K - Send the Fool Further! (medium)	C++14	trees *2100	May/28/2017
3494	N - April Fools' Problem (medium)	C++11	graphs *2400	May/28/2017
3493	F - Marmots (hard)	C++	probabilities *2800	May/28/2017
3492	E - Marmots (medium)	C++	math *2200	May/28/2017
3491	D - Marmots (easy)	C++	math *2100	May/28/2017
3490	H - Fake News (medium)	C++	strings *2200	May/28/2017
3489	J - Send the Fool Further! (easy)	C++14	trees *1400	May/28/2017
3488	M - April Fools' Problem (easy)	C++11	sortings *1200	May/28/2017
3487	I - Fake News (hard)	C++14	string suffix structures *2300	May/28/2017
3486	A - Heidi and Library (easy)	C++11	greedy *1800	May/28/2017
3485	B - Heidi and Library (medium)	C++11	greedy *1800	May/28/2017
3484	G - Fake News (easy)	C++	strings *800	May/28/2017
3483	B - Dynamic Problem Scoring	C++11	greedy *2000	May/08/2017
3482	A - Success Rate	C++11	math *1700	May/08/2017
3481	D - Lie or Truth	Go	sortings *1500	Apr/07/2017
3480	L - Bars	Java 8	greedy *2000	Apr/06/2017
3479	J - Stepan's Series	Python 2	dp *2000	Apr/06/2017
3478	E - Big Number and Remainder	C	number theory *2300	Apr/06/2017
3477	K - Stepan and Vowels	FPC	strings *1600	Apr/06/2017
3476	C - Maximum Number	JavaScript	greedy *1200	Apr/06/2017
3475	B - Significant Cups	C++14	two pointers *2100	Apr/05/2017
3474	A - Amusement Park	Ruby	ternary search *2100	Apr/05/2017
3473	B - Kids' Riddle	Java 8	*special problem *2000	Apr/01/2017
3472	C - INTERCALC	C++14	*special problem *1800	Apr/01/2017
3471	D - Touchy-Feely Palindromes	C++14	*special problem *1900	Apr/01/2017
3470	A - Numbers Joke	C++14	*special problem *1700	Apr/01/2017
3469	F - Crunching Numbers Just for You	Python 2	*special problem *1900	Apr/01/2017
3468	E - Twisted Circuit	C++11	brute force *2000	Apr/01/2017
3467	G - BF Calculator	Python 2	*special problem *2000	Mar/31/2017
3466	E - New task	C++14	data structures *2900	Mar/30/2017
3465	B - Weird journey	C++14	graphs *2100	Mar/30/2017
3464	C - The Great Mixing	C++14	shortest paths *2300	Mar/30/2017
3463	A - Functions again	C++14	two pointers *1600	Mar/30/2017
3462	B - Not Afraid	C++14	math *1300	Mar/24/2017
3461	A - The Monster	C++14	number theory *1200	Mar/24/2017
3460	C - Till I Collapse	C++14	divide and conquer *2400	Mar/24/2017
3459	B - Legacy	C++14	shortest paths *2300	Mar/24/2017
3458	A - Berzerk	C++14	games *2000	Mar/23/2017
3457	C - Bear and Company	C++14	dp *2500	Mar/19/2017
3456	B - Bear and Tree Jumps	C++14	trees *2100	Mar/19/2017
3455	A - Bear and Different Names	C++14	greedy *1500	Mar/18/2017
3454	C - Pie Packages	C++14		Mar/11/2017
3453	A - Salient Strings	C++14		Mar/11/2017
3452	B - Innokenty and a Football League	C++14	strings *1900	Mar/06/2017
3451	D - Axel and Marston in Bitland	C++14	matrices *2400	Mar/05/2017
3450	E - Andryusha and Nervous Barriers	C++14	data structures *2700	Mar/05/2017
3449	C - Underground Lab	C++14	trees *2100	Mar/05/2017
3448	A - Andryusha and Colored Balloons	C++14	trees *1600	Mar/05/2017
3447	D - Parquet Re-laying	C++14	constructive algorithms *2700	Feb/26/2017
3446	B - Bitwise Formula	C++14	expression parsing *1800	Feb/26/2017
3445	A - String Game	C++14	strings *1700	Feb/26/2017
3444	F - Sherlock's bet to Moriarty	C++14	trees *2800	Feb/24/2017
3443	G - Sherlock and the Encrypted Data	C++14	dp *2900	Feb/24/2017
3442	D - The Door Problem	C++14	graphs *2000	Feb/24/2017
3441	E - The Holmes Children	C++14	number theory *2100	Feb/24/2017
3440	C - Molly's Chemicals	C++14	math *1800	Feb/23/2017
3439	B - Sherlock and his girlfriend	C++14	number theory *1200	Feb/23/2017
3438	A - A Serial Killer	C++14	strings *900	Feb/23/2017
3437	C - Jon Snow and his Favourite Number	C++14	sortings *1800	Feb/21/2017
3436	B - Code For 1	C++14	divide and conquer *1600	Feb/21/2017
3435	F - Barrels and boxes	C++14	probabilities *2300	Feb/21/2017
3434	E - Game of Stones	C++14	games *2100	Feb/21/2017
3433	A - Oath of the Night's Watch	C++14	sortings *900	Feb/21/2017
3432	I - Sergey and exam	C++14		Jan/28/2017
3431	H - Sergey and sequence	C++14		Jan/28/2017
3430	F - Sergey’s columns	C++14		Jan/28/2017
3429	A - Sergey and reduction (Junior)	C++14		Jan/28/2017
3428	B - Big Top	C++14		Jan/28/2017
3427	C - Fighting all the Zombies	C++14		Jan/28/2017
3426	A - Subtle Sabotage	C++14		Jan/28/2017
3425	A - Hacker Cups and Balls	C++14		Jan/28/2017
3424	J - Zero Game	C++14		Jan/28/2017
3423	F - Lonely Dreamoon 2	C++14		Jan/27/2017
3422	G - Dreamoon and NightMarket	C++14		Jan/27/2017
3421	C - Crazy Dreamoon	C++14		Jan/27/2017
3420	E - Radio stations	C++14	data structures *2200	Jan/27/2017
3419	D - Bacterial Melee	C++14	string suffix structures *2400	Jan/23/2017
3418	C - Nikita and stack	C++14	data structures *2200	Jan/23/2017
3417	B - Travel Card	C++14	dp *1600	Jan/23/2017
3416	A - Pavel and barbecue	C++14	dfs and similar *1700	Jan/23/2017
3415	D - Beach Umbrellas	C++14		Jan/21/2017
3414	A - Pie Progress	C++14		Jan/21/2017
3413	B - Fighting the Zombies	C++14		Jan/21/2017
3412	C - Manic Moving	C++14		Jan/21/2017
3411	C - Fighting the Zombie	C++14		Jan/21/2017
3410	A - Progress Pie	C++14		Jan/21/2017
3409	B - Lazy Loading	C++14		Jan/21/2017
3408	D - PolandBall and Polygon	C++14	data structures *2000	Jan/16/2017
3407	E - PolandBall and White-Red graph	C++14	shortest paths *2400	Jan/16/2017
3406	C - PolandBall and Forest	C++14	trees *1300	Jan/16/2017
3405	B - PolandBall and Game	C++14	strings *1100	Jan/16/2017
3404	A - PolandBall and Hypothesis	C++14	number theory *800	Jan/16/2017
3403	C - Felicity is Coming!	C++14	strings *1900	Jan/13/2017
3402	E - Bash Plays with Functions	C++14	number theory *2500	Jan/13/2017
3401	D - Felicity's Big Secret Revealed	C++14	dp *2200	Jan/13/2017
3400	B - Bash's Big Day	C++14	number theory *1400	Jan/12/2017
3399	A - Gotta Catch Em' All!	C++14	*1000	Jan/12/2017
3398	D - Leaving Auction	C++14	data structures *2000	Dec/21/2016
3397	E - Inversions After Shuffle	C++14	probabilities *2400	Dec/20/2016
3396	C - Hongcow Buys a Deck of Cards	C++14	dp *2400	Dec/18/2016
3395	B - Hongcow's Game	C++14	interactive *1900	Dec/18/2016
3394	A - Hongcow Builds A Nation	C++14	graphs *1500	Dec/18/2016
3393	D - Permutations	C++14	matrices *2800	Nov/28/2016
3392	C - Ostap and Tree	C++14	trees *2500	Nov/28/2016
3391	B - Taxes	C++14	number theory *1600	Nov/28/2016
3390	A - Tennis Championship	C++14	math *1600	Nov/28/2016
3389	C - Subordinates	C++14	greedy *1900	Nov/20/2016
3388	B - Sea Battle	C++14	math *1700	Nov/20/2016
3387	A - Road to Cinema	C++14	binary search *1700	Nov/20/2016
3386	F - Drivers Dissatisfaction	C++14	trees *2200	Nov/01/2016
3385	D - Kostya the Sculptor	Java 8	hashing *1600	Oct/31/2016
3384	C - Epidemic in Monstropolis	Java 8	two pointers *1800	Oct/31/2016
3383	B - Parade	Java 8	math *1100	Oct/31/2016
3382	A - Grasshopper And the String	Java 8	*1000	Oct/31/2016
3381	D - Running Over The Bridges	C++11	math *2200	Oct/23/2016
3380	C - Bulmart	C++11	dfs and similar *2100	Oct/23/2016
3379	E - Award Ceremony	C++	greedy *2200	Oct/23/2016
3378	I - Olympiad in Programming and Sports	C++11	greedy *2000	Oct/23/2016
3377	A - Toda 2	C++	greedy *1800	Oct/23/2016
3376	H - Delete Them	C++11	constructive algorithms *1300	Oct/23/2016
3375	B - Minimum and Maximum	C++11	interactive *1800	Oct/23/2016
3374	J - Bottles	C++	dp *1900	Oct/23/2016
3373	G - Car Repair Shop	C++11	*1600	Oct/23/2016
3372	D - Contest Balloons	C++11	greedy *1800	Oct/23/2016
3371	C - Hidden Word	C++11	strings *1600	Oct/22/2016
3370	B - Food on the Plane	Python 2	math *1200	Oct/22/2016
3369	A - Jumping Ball	C++14	*1000	Oct/22/2016
3368	E - Dance Party	C++		Oct/13/2016
3367	B - Pouring Water	C++		Oct/13/2016
3366	A - The Baguette Master	C++11		Oct/12/2016
3365	D - Checkmate with Bishop and Knight	C++11		Oct/12/2016
3364	I - Odd Factor (64 MB ML!)	C++		Oct/12/2016
3363	H - Kids' Play	C++11		Oct/12/2016
3362	K - Average Speed	C++11		Oct/12/2016
3361	L - Subway	C++		Oct/12/2016
3360	C - Old Chess Sets	C++11		Oct/12/2016
3359	M - A multiplication game	C++		Oct/12/2016
3358	C - Ray Tracing	C++11	sortings *1800	Oct/08/2016
3357	D - Dense Subsequence	C++11	strings *1900	Oct/08/2016
3356	B - Batch Sort	C++11	math *1500	Oct/08/2016
3355	A - Checking the Calendar	C++11	*1000	Oct/08/2016
3354	C - Card Collecting	C++		Oct/06/2016
3353	D - Double Elimination	C++11		Oct/05/2016
3352	H - Hunter's Apprentice	C++11		Oct/05/2016
3351	L - Sympathetic Tables	C++		Oct/05/2016
3350	K - Mixing Bowls	C++11		Oct/05/2016
3349	G - Ground Defense	C++11		Oct/05/2016
3348	F - Flight Plan	C++		Oct/05/2016
3347	J - Jurisdiction Disenchantment	C++		Oct/05/2016
3346	E - Election of Evil	C++11		Oct/05/2016
3345	I - Ingenious Lottery Tickets	C++11		Oct/05/2016
3344	A - Assembly Required	C++		Oct/05/2016
3343	B - Bulbs	C++11		Oct/05/2016
3342	A - Letters Cyclic Shift	C++11	strings *1200	Aug/25/2016
3341	B - Recover the String	C++11	math *1900	Aug/25/2016
3340	D - Recover the String	C++11	math *1900	Aug/25/2016
3339	C - Sereja and Brackets	C++11	schedules *2000	Aug/10/2016
3338	C - Break Up	C++11	graphs *2600	Jul/23/2016
3337	B - Connecting Universities	C++11	trees *1800	Jul/23/2016
3336	A - As Fast As Possible	C++11	math *1900	Jul/23/2016
3335	B3 - Recover Polygon (hard)	C++11	*2600	Jul/10/2016
3334	B2 - Recover Polygon (medium)	C++11	geometry *2600	Jul/10/2016
3333	A3 - Collective Mindsets (hard)	C++	*2400	Jul/10/2016
3332	E2 - Photographs (II)	C++11	*2600	Jul/10/2016
3331	A2 - Collective Mindsets (medium)	C++	*2300	Jul/10/2016
3330	C3 - Brain Network (hard)	C++11	trees *2200	Jul/10/2016
3329	E1 - Photographs (I)	C++11	*1800	Jul/10/2016
3328	C2 - Brain Network (medium)	C++11	trees *1500	Jul/10/2016
3327	C1 - Brain Network (easy)	C++11	*1300	Jul/10/2016
3326	D3 - The Wall (hard)	C++11	*2100	Jul/10/2016
3325	B1 - Recover Polygon (easy)	C++11	*1700	Jul/10/2016
3324	D2 - The Wall (medium)	C++11	combinatorics *1800	Jul/10/2016
3323	F1 - Tree of Life (easy)	C++11	*1300	Jul/10/2016
3322	D1 - The Wall (easy)	C++11	*1200	Jul/10/2016
3321	A1 - Collective Mindsets (easy)	C++	*1100	Jul/10/2016
3320	B - Kay and Snowflake	C++11	trees *1900	Jun/24/2016
3319	A - Robbers' watch	C++11	math *1700	Jun/24/2016
3318	C - Alyona and the Tree	C++11	trees *1600	Jun/18/2016
3317	B - Alyona and Mex	C++	sortings *1200	Jun/18/2016
3316	A - Alyona and Numbers	C++11	number theory *1100	Jun/18/2016
3315	E - Alyona and Triangles	C++11	two pointers *2600	Jun/18/2016
3314	D - Alyona and Strings	C++11	strings *1900	Jun/18/2016
3313	I - Loader	Kotlin	*special problem *2500	Jun/17/2016
3312	G - The Fraction	Kotlin	*special problem *1900	Jun/17/2016
3311	H - Exchange of Books	Kotlin	*special problem *1900	Jun/17/2016
3310	F - Reformat the String	Kotlin	*special problem *1800	Jun/17/2016
3309	E - Hammer throwing	Kotlin	*special problem *1800	Jun/17/2016
3308	D - Chocolate Bar	Kotlin	math *1400	Jun/17/2016
3307	C - Symmetric Difference	Kotlin	*special problem *1600	Jun/17/2016
3306	B - The Teacher of Physical Education	Kotlin	*special problem *1600	Jun/17/2016
3305	A - The Check of the Point	Kotlin	geometry *1200	Jun/17/2016
3304	E - Runaway to a Shadow	C++11	sortings *2500	Jun/15/2016
3303	B - Economy Game	C++11	brute force *1300	Jun/15/2016
3302	A - A Good Contest	C++11	*800	Jun/15/2016
3301	C - Heap Operations	C++11	greedy *1600	Jun/15/2016
3300	D - Gifts by the List	C++11	trees *2000	Jun/15/2016
3299	F - Lena and Queries	C++11	geometry *2500	Jun/14/2016
3298	E - Another Sith Tournament	C++11	probabilities *2200	Jun/14/2016
3297	D - Theseus and labyrinth	C++11	shortest paths *2000	May/27/2016
3296	C - Vasya and String	C++11	two pointers *1500	May/27/2016
3295	B - Different is Good	C++11	strings *1000	May/12/2016
3294	A - Summer Camp	C++11	*800	May/12/2016
3293	C - Ultimate Weirdness of an Array	C++11	number theory *2800	May/12/2016
3292	B - Robin Hood	C++11	greedy *2000	May/12/2016
...	...	...	...	...