prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -O2 -o main.o -c main.cpp 
main.cpp: In function 'int RanSel(int*, int, int, int)':
main.cpp:140:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
main.cpp: In function 'int FindIndex(int*, int, int, int)':
main.cpp:146:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
main.cpp: In function 'int DeterSel(int*, int, int, int)':
main.cpp:170:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
main.cpp: In function 'int main()':
main.cpp:215:55: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]
  else { cout << "The order-" << num << " item is " << val << endl; }
                                                       ^~~
g++ -g -Wall -O2 -o main main.o
finished

clean (3/3): 
finished

all task finished, build successfully