View Compilation Error

41400_0_16457.cpp: In function `int fun(int)':
41400_0_16457.cpp:56: error: `max' undeclared (first use this function)
41400_0_16457.cpp:56: error: (Each undeclared identifier is reported only once for each function it appears in.)
41400_0_16457.cpp: In function `int main()':
41400_0_16457.cpp:90: error: `max' undeclared (first use this function)