View Compilation Error

756044_0_0_16633.cpp: In function `void Union(int, int)':
756044_0_0_16633.cpp:28: error: `max' undeclared (first use this function)
756044_0_0_16633.cpp:28: error: (Each undeclared identifier is reported only once for each function it appears in.)
756044_0_0_16633.cpp: In function `int main()':
756044_0_0_16633.cpp:42: error: `max' undeclared (first use this function)