You can use whatever language you want. To do that change settings properly:
Ctrl+,
acmx.execution.compile
You have access to two variable in this line:
$PROGRAM
the path to your solution. (in the case of C++ /path/to/sol.cpp
)$OUTPUT
the path to an executable that run your program.By default it is: g++ -std=c++11 $PROGRAM -o $OUTPUT
which compile c++11 code using g++.
You can use other compilers, or even better, awesome scripts that solve your particular problem.