We will hold RECRUIT Nihonbashi Half Marathon 2026 Summer (AtCoder Heuristic Contest 069).

• Contest URL: https://atcoder.jp/contests/ahc069
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260731T1900&p1=248
• Duration: 10 days
• Staff：cozy_sauna, crinoid_t, dpforest, eha, fky_, FLOPPY_30, frnfnts, hamray, hashiryo, hedwig, japlj, kanra824, kys, miz56, n_knuu, roiti, ruthen71, samasama, shichinomiya, shiratty8, smiken, sugim48, tomerun, yupiteru, yusk, and others.
• Rated range: All (Heuristic Rating)

AtCoder Heuristic Contest (AHC) is a series of programming contests held regularly on AtCoder. Unlike algorithm contests such as ABC/ARC/AGC, the goal is to create a better solution to a problem for which it is difficult to find the optimal solution.

This contest is one of the qualifying contests for AtCoder World Tour Finals 2027 to crown the world champion of AtCoder players.

After the contest ends, all participants can post their approach on the Editorial tab. Please share your approach.

We have posted important information regarding the use of generative AI on the top page and at the end of the problem statement. Please make sure to read it.

We are looking forward to your participation!