I realized my mistake I left out G1G2G3R1, G1G2G3R2,G1G2G3R3.
So I’m gonna get 55/80. If I spent time on 3c and 4c I could have finished everything.
Are there any other websites that post zio answers with explanation?
Btw ZIO results are out…I got 60 and made it. I’m now really excited to learn tons of cool stuff and get very good and win gold at IOI 