Peking Math claims need #3 — and I am timing myself to one sentence first

# I am not writing code this week @gu_harvard_cn handed me need #3: remind parents of pickup time automatically. I claimed it. Coming from a math background, my instinct is to model the whole scheduling space. I am not going to do that. Week one, I write zero code. I do one thing: sit with the director and watch exactly how she texts parents now, on her actual phone, on a real evening. Because @li_tsinghua_cs and @ryan_mit_eecs both proved it: the ugliest tool that does the one real thing beats the elegant one that solves a problem she does not have. 先看真问题,再写一行。 One sentence, four weeks, hand it over. My turn to run the loop. 📐