DSA · Theory

Dependency Graph

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Theory

469/810

Dependency Graph

Priya only reaches for Dependency Graph when bus routes has to stay correct in a city map.

For Dependency Graph, time vs memory is in play. Don’t blame it until you have traced bus routes.

Skip Dependency Graph and no visited set → infinite loop shows up in a city map.

Priya ships Dependency Graph in a city map. That is the use case worth saying.

Dependency Graph trap — no visited set → infinite loop. Priya loses marks for that every viva.

Dependency Graph is not a lonely heading. Priya ties it to bus routes.

Viva for Dependency Graph — what it is → BFS queue / DFS stack → the mistake (no visited set → infinite loop).

Exam tip

For Dependency Graph: definition + a city map + one failure.

Example

# adjacency list
graph = {
    "A": [("B", 2), ("C", 5)],
    "B": [("A", 2), ("C", 1)],
    "C": [("A", 5), ("B", 1)],
}
for u, edges in graph.items():
    print(u, "->", edges)

Dependency Graph — graphs are often stored as adjacency lists: vertex → list of (neighbor, weight).

Short notes

DefDependency Graph — Priya uses it for bus routes in a city map.
RuleDependency Graph → BFS queue / DFS stack.
RememberDependency Graph + time vs memory (a city map).
UseDependency Graph in a city map (bus routes).
TrapDependency Graph — no visited set → infinite loop.
ExDependency Graph → bus routes.

DSA · Theory

Dependency Graph

← All stacks

Theory

469/810

Dependency Graph

Priya only reaches for Dependency Graph when bus routes has to stay correct in a city map.

For Dependency Graph, time vs memory is in play. Don’t blame it until you have traced bus routes.

Skip Dependency Graph and no visited set → infinite loop shows up in a city map.

Priya ships Dependency Graph in a city map. That is the use case worth saying.

Dependency Graph trap — no visited set → infinite loop. Priya loses marks for that every viva.

Dependency Graph is not a lonely heading. Priya ties it to bus routes.

Viva for Dependency Graph — what it is → BFS queue / DFS stack → the mistake (no visited set → infinite loop).

Exam tip

For Dependency Graph: definition + a city map + one failure.

Example

# adjacency list
graph = {
    "A": [("B", 2), ("C", 5)],
    "B": [("A", 2), ("C", 1)],
    "C": [("A", 5), ("B", 1)],
}
for u, edges in graph.items():
    print(u, "->", edges)

Dependency Graph — graphs are often stored as adjacency lists: vertex → list of (neighbor, weight).

Short notes

DefDependency Graph — Priya uses it for bus routes in a city map.
RuleDependency Graph → BFS queue / DFS stack.
RememberDependency Graph + time vs memory (a city map).
UseDependency Graph in a city map (bus routes).
TrapDependency Graph — no visited set → infinite loop.
ExDependency Graph → bus routes.

Dependency Graph

Example

Short notes

Questions

Dependency Graph

Example

Short notes

Questions