hi. i have got wa 3 in 1790A - Polycarp and the Day of Pi. here is my submission 250262189. what is the problem? i looked at test details but i think my code works efficiently

1926C - Vlad and a Sum of Sum of Digits i couldn't find optimal solution in the contest for this problem so after the contest i looked at editorial and it was actually easy. but i tried some submissions and i get TLE 2.

247790985 please look at this submission which i get tle 2

Hello dear Codeforces community. I have a big problem about practicing competitive programming. Can someone advice me an excellent roadmap? Because I often fail doing 1100-1400 skilled problems. Thank you!