Aaj ke live me maine Codeforces Round 734 (Div 3) ke Problem A, B1, B2 aur C ko discuss kiya—seedha contest wali vibe ke saath. Honestly bolu to contest mujhe “bahut bekaar” feel hua, but phir bhi discuss isliye kiya kyunki ho sakta hai kisi ko B2/C hard lag raha ho aur unko clarity mil jaaye. Main baar-baar ye bhi bolta hoon: ek contest kharab ho gaya to panic mat karo—practice karo, thoda “thought process develop” karo, aur next round me bounce back. B1 (Wonderful Coloring - 1) me core observation ye tha ki 2 colors hone ki wajah se kisi bhi letter ko max 2 baar paint kar sakte ho, aur hume painted letters maximum rakhte hue red/green count equal rakhna hota hai. B2 me same idea extend hota hai: k colors hone par kisi character ko at most k times paint kar paoge, phir total paintable letters nikaalke k se equally distribute karna hota hai (total ko k ka multiple banana). Main ne B2 ke “good vs bad implementation” ka point bhi highlight kiya—logic simple hai, implementation me log atakte hain. Problem C me main ne 5 letters (a-e) ke liye greedy approach bataya: har word ka score = f(letter) - f(others), scores sort descending, aur jab tak cumulative sum positive rahe tab tak words pick karo. Ye approach fast bhi hai aur contest me reliably kaam karta hai.