yc was 0 to 1, not 1 to n. You can't be greedy when doing 0 to 1: you'll just fail. But those imitating yc are doing 1 to n, and it's easy to underestimate what

yc was 0 to 1, not 1 to n. You can't be greedy when doing 0 to 1: you'll just fail. But those imitating yc are doing 1 to n, and it's easy to underestimate what made 0 to 1 work in the first place.