View Compilation Error

0_0_5020883_11507.cpp: In function `int main()':
0_0_5020883_11507.cpp:25: error: `max' undeclared (first use this function)
0_0_5020883_11507.cpp:25: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5020883_11507.cpp:27: error: `k' undeclared (first use this function)