I have different polygons in layer a_input. The Polygons are adjacent and connected inside the layers and it should be. The Polygons in layer a_input have to fit adjacent to a polygon of layer 2 b_input. I tried v.edit and v.overlay but didn't find the right options to get the result I wanted.
In the Picture, the green Polygon is the b_input and the black lines are the boundaries of the polygons in a_input. They have to fit the boundaries of the polygon in b_input. The red line is the result of v.edit.
How to solve such question in QGIS?