If you want to quickly find the witch’s hut in Minecraft 1.11.2/1.12.2, then just use this seed to generate the world. You will spawn very close to her and then you can act at your discretion.
When using this seed, you will appear in the swamp almost next to the hut. The hut may be empty, in which case you can immediately take it. Otherwise, you will need to prepare a little and get rid of the witch. Inside the hut is a workbench and cauldron, which will facilitate survival and craft at the beginning of the game.
Seed IDFor 1.11.2/1.12.2: