Battle friends, practice with an AI coach whose hint mode never spoils the answer, and build the programming + AI skills the next decade actually hires for. Free to start, no card.
1# Starport Access Code2import sys34data = sys.stdin.read().split()5t = int(data[0])6ptr = 178for _ in range(t):9 n = int(data[ptr])10 s = data[ptr + 1]11 ptr += 21213 possible = False14 for i, ch in enumerate(s):15 if ch == "8" and n - i == 11:16 possible = True17 break1819 print("YES" if possible else "NO")
Your path
Everything lives in one account. Your ranked Elo, streaks, and practice history travel with you.
Ranked 1v1
Real-time duels on curated problems, matched to your skill level.
Find a matchFinding you a worthy opponent…
Scanning for opponents in your skill range…
Guided practice
Rena nudges your thinking: concept first, never the full answer.
Practice with hints1# Starport Access Code2import sys34data = sys.stdin.read().split()5t = int(data[0])6ptr = 178for _ in range(t):9 n = int(data[ptr])10 s = data[ptr + 1]11 ptr += 21213 possible = False14 for i, ch in enumerate(s):15 if ch == "8" and n - i == 11:16 possible = True17 break1819 print("YES" if possible else "NO")
Puzzle Rush
Quick trace-the-code puzzles for the bus, the queue, the boring lecture.
Start a rushPuzzle Battle
Fast CS puzzles, one opponent, score pressure from the first question.
Mock interviews
Interview-style sessions that train how you communicate and verify.
Try interview prepTimer will start after the introduction
Clara
Hello, I'm Clara, your AI interviewer. Please take your time to read and understand the problem. You have about 3 minutes to read through it. I'll check back with you when the time is up. Good luck!
Clara is speaking...
Input blocked during reading
Student pricing
Competing and practicing never cost money. Paid tiers add bigger monthly Rena budgets when you want more AI coaching.
Battles, practice, puzzles, and monthly tastes of every AI feature.
Serious monthly Rena budgets for hints, chat, and code review.
Unlimited Rena chat and mock interviews. For the all-in semester.