Dear Codeforces community,

Lately, we have successfully organized a high-schoolers' contest: HNOI Civil War. The contest was born as a "rivalry" between two of the best Hanoi-based gifted high schools: Hanoi-Amsterdam High School and Nguyen Hue High School. 3-people organizing committee includes: Trung Lan Nguyen (lantrungseo) — as the Head Organizer, Bao Quoc Ngo (b21quocbao) — as the Head Problemsetter and coach for Nguyen Hue informatics team for this contest, and me, Dung Tuan To low_ — as the Head Coordinator and coach for Hanoi-Amsterdam team.

The competition consists of two contests: an Individual-based OI-formatted round and a Team-based ACM-formatted round. You can visit the rounds as information listed below:

• Individual Round One (July 14): written by low_ and lantrungseo, consists of 4 OI problems, https://codeforces.net/gym/102272.

• Individual Round Two (July 14): written by b21quocbao, consists of 3 OI problems:

(The onsite participants were only allowed to submit once after the end of the contest — just like a mock test of Vietnamese Olympiads in Informatics. All problem statements from these OI contests are in Vietnamese. You can request English statements in my Email, but don't expect it to be fast)

• Team Round (July 21): written by low_, lantrungseo and b21quocbao, consists of 12 ACM-based problems (we rate it as a 3-star gym round by ourselves): HCW 19 Team Round (ICPC format). Statements of this round are in English, so you can easily virtual participate and try if you can solve all the problems.

Here are the results:

Individual Rounds:

First Prize: Tan Huu Trinh (tan472002) from Nguyen Hue High School. Second Prize: Dong Quang Le (CNH_Tourist) from Nguyen Hue High School. Third Prize: Dat Quoc Ngo (datr1bs) and Nam Hai Do-Nguyen (NamSPro), both from Hanoi-Amsterdam High School. Best Lower-grader Performance (awards for best performance of students born in 2003 or later): Minh Duc Le (ld_minh4354), from Hanoi-Amsterdam High School (He was born in 2004 and is just a 10th-grader!).

Team Round:

Winner: Ams.TRIGGER (Nam Hai Do-Nguyen NamSPro, Bach Gia Truong bachtruoq, and Phuc Linh Bui-Huy lienquanpc). Best Lower-grader Performance: NH.Noob_Strike(Yaosu) (Dong Quang Le CNH_Tourist, Linh Hong Nguyen Chanchan, and Khoa Anh Nguyen-Viet darkness_peach).

So which school wins?

Each school performance is assessed by a scale of 1000: 70% of it comes from Individual Rounds and the other 30% comes from Team Round. The formula for each school is calculated as below, and only top 7 individuals and top 2 teams of each school are considered for this assessment:

int individualPoints=sumBest7Performances; //max point of each performance is 40 - same as VOI
int teamPoints=totalProblemCount2HighestRankedTeam*12.5-totalPenalties2HighestRankedTeam*0.02; //max point is 150 for each team
int finalPoint=individualPoints*2.5+teamPoints;

(I dunno how to put maths here ;-;)

So here is the result:

Hanoi-Amsterdam High School

Individual: 76.24 Team: 89.32 Total: 279.92

Nguyen Hue High School

Individual: 70.59 Team: 93.22 Total: 269.695

Close call at the end of the Team Round, but Hanoi-Amsterdam High School wins!!