View Compilation Error

0_0_2199196_4744.cpp: In function `int main()':
0_0_2199196_4744.cpp:4: error: `cin' undeclared (first use this function)
0_0_2199196_4744.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2199196_4744.cpp:10: error: `greater' undeclared (first use this function)
0_0_2199196_4744.cpp:10: error: expected primary-expression before "int"
0_0_2199196_4744.cpp:10: error: `sort' undeclared (first use this function)
0_0_2199196_4744.cpp:11: error: expected primary-expression before "int"
0_0_2199196_4744.cpp:40: error: `cout' undeclared (first use this function)
0_0_2199196_4744.cpp:40: error: `endl' undeclared (first use this function)