View Compilation Error

0_0_11512833_23646.cpp: In function `int main()':
0_0_11512833_23646.cpp:14: error: `cin' undeclared (first use this function)
0_0_11512833_23646.cpp:14: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11512833_23646.cpp:21: error: no matching function for call to `max(LL&, int&)'
0_0_11512833_23646.cpp:24: error: `cout' undeclared (first use this function)
0_0_11512833_23646.cpp:24: error: `endl' undeclared (first use this function)