prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -O2 -o main.o -c main.cpp 
main.cpp: In function 'int findPivot(int*, int, int)':
main.cpp:116:50: warning: 'tmpnum' may be used uninitialized in this function [-Wmaybe-uninitialized]
         else if(cnt == groupNum-1)  insertionSort(tmp[groupNum-1], tmpnum);
                                     ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
main.cpp: In function 'int deterSelection(int*, int, int)':
main.cpp:157:50: warning: 'tmpnum' may be used uninitialized in this function [-Wmaybe-uninitialized]
         else if(cnt == groupNum-1)  insertionSort(tmp[groupNum-1], tmpnum);
                                     ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
main.cpp: In function 'int main()':
main.cpp:195:49: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
     cout << "The order-" << i << " item is " << a << endl;
                                                 ^
g++ -g -Wall -O2 -o main main.o
finished

clean (3/3): 
finished

all task finished, build successfully