../programs/60913.cpp: In constructor 'Node::Node(int)':
../programs/60913.cpp:9: error: 'nullptr' was not declared in this scope
../programs/60913.cpp: In function 'int main()':
../programs/60913.cpp:49: error: 'nullptr' was not declared in this scope
../programs/60913.cpp:58: error: 'nullptr' was not declared in this scope
../programs/60913.cpp:62: error: 'nullptr' was not declared in this scope
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