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The tree is expanded breadth-first. After the root's children are created, the instructor treats that whole level as completed and then expands nodes from left to right across the current frontier.

Conditions: The tree is explored level by level.; At each node, only jobs not already used on the path from the root are appended.; The clip shows structural expansion only, not pruning by bounds.

The tree is expanded breadth-first. After the root's children are created, the instructor treats that whole level as completed and then expands nodes from left to right across the current frontier.

Conditions: The tree is explored level by level.; At each node, only jobs not already used on the path from the root are appended.; The clip shows structural expansion only, not pruning by bounds.

A solution can be represented in two main ways: as a variable-size subset of selected jobs (e.g., $S1 = {J_1, J_4}$), or as a fixed-size binary vector where each position corresponds to a job and the value indicates whether the job is done (1) or not (0) (e.g., $S2 = {1, 0, 0, 1}$).

Conditions: The problem involves selecting a subset of jobs from a given set.; The representation must clearly indicate which jobs are included in the solution.

A solution can be represented in two main ways: as a variable-size subset of selected jobs (e.g., $S1 = {J_1, J_4}$), or as a fixed-size binary vector where each position corresponds to a job and the value indicates whether the job is done (1) or not (0) (e.g., $S2 = {1, 0, 0, 1}$).

Conditions: The problem involves selecting a subset of jobs from a given set.; The representation must clearly indicate which jobs are included in the solution.