View Compilation Error

0_0_13040283_22514.cpp:5: error: `usingnamespace' does not name a type
0_0_13040283_22514.cpp: In function `int main()':
0_0_13040283_22514.cpp:32: error: `sort' undeclared (first use this function)
0_0_13040283_22514.cpp:32: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_13040283_22514.cpp:54: error: `return0' undeclared (first use this function)