prepare (1/3): 
finished

make (2/3): 
g++ -Wall -std=c++11 -O2 -o main main.cpp
main.cpp: In function 'int main(int, char**)':
main.cpp:339:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
        for (auto i = 0; i < size / 2; i++)++it_median;
                         ~~^~~~~~~~~~
main.cpp:699:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (auto i = 0; i < size / 2; i++)++it_median;
                      ~~^~~~~~~~~~
finished

clean (3/3): 
finished

all task finished, build successfully