Tasks are here: https://ioi2023.hu/tasks/

You can solve all IOI 2023 Day 1 tasks here: https://oj.uz/problems/source/644

In case you want to solve it in 5 hours, you can try our unofficial mirror here: https://oj.uz/contest/view/IOI2023DAY1

Currently the translations of the tasks are not provided, but we will upload it after it's available.