Background
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Write a program that simulates a team hiking through a forest at night. 
The team encounters a series of narrow bridges along the way. At each 
bridge they may meet additional hikers who need their help to cross the 
bridge. The narrow bridge can only hold two people at a time. They have 
one torch and because it's night, the torch has to be used when crossing 
the bridge. Each hiker can cross the bridge at different speeds. When 
two hikers cross the bridge together, they must move at the slower 
person's pace. 

Determine the fastest time that the hikers can cross each bridge and the 
total time for all crossings. The input to the program will be a yaml 
file that describes the speeds of each person, the bridges encountered, 
their length, and the additional hikers encountered along the way. Your 
solution should assume any number of people and bridges can be provided 
as inputs. Demonstrate the operation of your program using the following 
inputs: the hikers cross 3 bridges, at the first bridge (100 ft long) 4 
hikers cross (hiker A can cross at 100 ft/minute, B at 50 ft/minute, C 
at 20 ft/minute, and D at 10 ft/minute), at the second bridge (250 ft 
long) an additional hiker crosses with the team (E at 2.5 ft/minute), 
and finally at the last bridge (150 ft long) two hikers are encountered 
(F at 25 ft/minute and G at 15 ft/minute). 

Windows Build
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Build with Visual Studio using Release/x64 configuration. It's also
possible to build with gradle (requires Visual Studio and Java JRE).
Execute from the Native Tools Command Prompt:
gradlew.bat assembleRelease
Then run test.bat from the command line.
Tested with Visual Studio 2017 community edition.

Linux Build
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Build with gradle. Requires Java JRE is also installed. It will detect
and use gcc or clang compiler. Make sure the active compiler version
supports C++11 (eg gcc 7). Then run test.sh. To build:
./gradlew assembleRelease

Acknowledgment
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yaml-cpp 0.62       https://github.com/jbeder/yaml-cpp
googletest 1.8.1    https://github.com/google/googletest
gradle 6.7.1        https://gradle.org/

See "3rdParty Licenses" for complete license for above software.