View Compilation Error

0_0_4409177_12433.cpp: In function `int main()':
0_0_4409177_12433.cpp:29: error: `sort' undeclared (first use this function)
0_0_4409177_12433.cpp:29: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4409177_12433.cpp:34: error: `max' undeclared (first use this function)
0_0_4409177_12433.cpp:34: error: `min' undeclared (first use this function)