IntermediateSimulation2000 ms256 MB
Bus Stop Simulation
Track passengers on a bus after a sequence of stops.
Statement
Track passengers on a bus after a sequence of stops.
Input
First line: starting passengers and number of stops. Next lines: passengers leaving and entering.
Output
Final passenger count.
Constraints
- Passenger count never becomes negative.
Examples
Example 1
Input
10 3
2 5
4 1
3 2Output
9Start with 10 and apply each stop change.
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