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Problem C,B,A | Codeforces Round-742(Div-2) | Live Chat

2.1K views· 126 likes· 70:44· Sep 5, 2021
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Link to Solutions: https://codeforces.com/contest/1567/submission/127989712 https://codeforces.com/contest/1567/submission/127988935 https://codeforces.com/contest/1567/submission/127989755 Hey, My name is Mihir Singh I am an active competitive programmer. You can connect with me here: My codeforces profile: https://codeforces.com/profile/kassutta My LinkedIn profile: https://www.linkedin.com/in/mihir-singh-848531170 My instagram profile: https://www.instagram.com/mihirre_singh/ Use Special Code MIHIR10 to get 10% off on your Unacademy Subscription 10% Discount on any GFG course, Use Code: MIHIR DSA self-paced: https://practice.geeksforgeeks.org/courses/dsa-self-paced Link to all courses: https://practice.geeksforgeeks.org/courses/online Timestamps: 00:00 : Setting up stream and overview 04:35 : Problem B 32:56 : Problem C 01:05:44 : Problem A For any queries: contact us at cp.gatecs@gmail.com Follow us on-- @discord:- https://discord.com/invite/6kcmVQx8Fx @facebook:- https://www.facebook.com/Quarantine-Engineers-107789377679897/ @linkedin :- https://www.linkedin.com/company/quarantine-engineers @instagram :-https://www.instagram.com/quarantine_engineers/ @telegram(Channel) :- https://t.me/quarantine_engineers @telegram(Discussion Forum) :- https://t.me/qe_discussion #Codeforces #742 #DIV2

About This Video

Is live stream me thoda “live accident” bhi hua—pehla stream pata nahi kaise end ho gaya, to maine dubara start karke same Codeforces Round 742 (Div 2) ke A, B, C ko wapas calmly discuss kiya. Flow simple rakha: pehle setup/overview, phir Problem B (Mix and Mix), phir Problem C, aur last me Problem A. Main focus ye tha ki contest me DP pe jump karne se pehle observation nikaalo—kyunki maine apne friends ke submissions me bhi dekha, log unnecessary complex cheezein kar rahe the. Problem B me maine bitwise observation se approach batayi: max/mex type constraints ko dekh ke minimum array size kaise decide karte ho, aur “required OR” vs “current OR” ka bit-level mismatch nikaal ke extra element add (ya kabhi-kabhi split) karke condition satisfy kara dete ho. Problem C me key takeaway ye tha ki carry ka effect alternate digits pe independent hota hai—odd/even positions ko alag treat karke do smaller numbers bana do, normal addition jaisa count nikaal lo, aur answers multiply kar do. Overall, video ka goal ye hi hai: fast contest thinking + clean observations, aur jo solution hai wo main openly share karta hoon (submissions links description me hain).

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