Problems
Past problems
- November 2012: zenitlearn, zenittestsum,
- March 2018: zenit17cka, zenit17ckb, zenit17ckc, zenit17ckd, zenit17cke, zenit17ckf, zenit17ckg, zenit17ckh, zenit17cki, zenit17ckj, zenit17ckk, zenit17ckl,
- November 2017: zenit17kka, zenit17kkb, zenit17kkc, zenit17kkd, zenit17kke, zenit17kkf, zenit17kkg, zenit17kkh, zenit17kki, zenit17kkj, zenit17kkk, zenit17kkl,
- October 2017: zenit17ska, zenit17skb, zenit17skc, zenit17skd, zenit17ske, zenit17skf, zenit17skg, zenit17skh, zenit17ski,
- February 2017: zenit16cka, zenit16ckb, zenit16ckc, zenit16ckd, zenit16cke, zenit16ckf, zenit16ckg, zenit16ckh, zenit16cki, zenit16ckj, zenit16ckk, zenit16ckl,
- November 2016: zenit16kka, zenit16kkb, zenit16kkc, zenit16kkd, zenit16kke, zenit16kkf, zenit16kkg, zenit16kkh, zenit16kki, zenit16kkj, zenit16kkk,
- October 2016: zenit16ska, zenit16skb, zenit16skc, zenit16skd, zenit16ske, zenit16skf, zenit16skg, zenit16skh, zenit16ski, zenit16skz,
- February 2016: zenit15cka, zenit15ckb, zenit15ckc, zenit15ckd, zenit15cke, zenit15ckf, zenit15ckg, zenit15ckh, zenit15cki, zenit15ckj,
- November 2015: zenit15kka, zenit15kkb, zenit15kkc, zenit15kkd, zenit15kke, zenit15kkf, zenit15kkg, zenit15kkh, zenit15kki, zenit15kkj, zenit15kkk, zenit15kkl,
- October 2015: zenit15ska, zenit15skb, zenit15skc, zenit15skd, zenit15ske, zenit15skf, zenit15skg, zenit15skh, zenit15ski,
- February 2015: zenit14cka, zenit14ckb, zenit14ckc, zenit14ckd, zenit14cke, zenit14ckf, zenit14ckg, zenit14ckh, zenit14cki, zenit14ckj,
- December 2014: zenit14kka, zenit14kkb, zenit14kkc, zenit14kkd, zenit14kke, zenit14kkf, zenit14kkg, zenit14kkh, zenit14kki, zenit14kkj,
- November 2014: zenit14ska, zenit14skb, zenit14skc, zenit14skd, zenit14ske, zenit14skf, zenit14skg, zenit14skh, zenit14ski,
- February 2014: zenit13cka, zenit13ckb, zenit13ckc, zenit13ckd, zenit13cke, zenit13ckf, zenit13ckg, zenit13ckh, zenit13cki, zenit13ckj, zenit13ckk,
- December 2013: zenit13kka, zenit13kkb, zenit13kkc, zenit13kkd, zenit13kke, zenit13kkf, zenit13kkg, zenit13kkh, zenit13kki, zenit13kkj, zenit13kkk,
- November 2013: zenit13ska, zenit13skb, zenit13skc, zenit13skd, zenit13ske, zenit13skf, zenit13skg, zenit13skh, zenit13ski, zenit13skj,
- February 2013: zenit12cka, zenit12ckb, zenit12ckc, zenit12ckd, zenit12cke, zenit12ckf, zenit12ckg, zenit12ckh, zenit12cki, zenit12ckj, zenit12ckk, zenit12ckl,
- December 2012: zenit12kka, zenit12kkb, zenit12kkc, zenit12kkd, zenit12kke, zenit12kkf, zenit12kkg, zenit12kkh, zenit12kki, zenit12kkj, zenit12kkk,
- December 2011: zenit11kka, zenit11kkb, zenit11kkc, zenit11kkd, zenit11kke, zenit11kkf, zenit11kkg, zenit11kkh, zenit11kki, zenit11kkj,
- February 2012: zenit11cka, zenit11ckb, zenit11ckc, zenit11ckd, zenit11cke, zenit11ckf, zenit11ckg, zenit11ckh, zenit11cki, zenit11ckj,