To become specialist and expert which method i should follow. Someone suggest to follow A2oj by level and someone suggest to follow mustofa saad junior training sheet by (A, B, C, D) level wise. Please can anyone suggest me, which method i should follow.

Actually, this is my alternate id. But my thinking speed is so slow, i can't solve div-2 (A & B) in 1 hour. Maximum time it takes more enough time to solve div-2 (A & B). But i cant take serious in virtual contest too. For this reason, i want any group where organised contest daily.... Plz, can anyone suggest some type of this group?

https://codeforces.com/contest/1307/problem/C

I can't understand, how to solve this. Plz, anyone suggest me how to solve this. Thanks in advance

I've solved almost 650+ problems in codeforce. But i can't solved div-2(A and B) in 1 hour in contest time, sometimes it required 1 hour to solve A.

Now i described how solves 650+ problems. I solved last 200 problem in topicwise like greedy, string, number theory and constructive from 1000-1400 level. But i can't solve as fast in contest time. Now my rating under 1200. Please suggest me in which approach i can solve problem so that i can solve (A and B) in 30 min.