<｜begin▁of▁sentence｜>### Instruction:
As an international aid worker providing humanitarian assistance in a foreign country, you are tasked with coordinating the layout of an emergency response network. You have received a request to map out the connections between different aid stations in a disaster-affected region using a graph representation. Now, you need to apply a layout algorithm to visualize the network and then manually adjust the position of a key aid station to specific coordinates in order to optimize the overall response efforts.
### Response:
import igraph as ig

# Create a simple graph
edges = [(0, 1), (1, 2), (2, 3), (3, 4), (4, 0)]
g = ig.Graph(edges=edges)

# Apply a layout algorithm to position the nodes
g_layout = g.layout_circle()

# Manually override the position of a single node
# Assuming the layout is a list of (x, y) tuples
index_to_update = 2  # Index of the node whose position you want to update
new_position = (100, 100)  # The new (x, y) position for the node
g_layout[index_to_update] = new_position

# Use the updated layout to plot the graph
ig.plot(g, layout=g_layout)
<|EOT|>
