prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -O2 -o main.o -c main.cpp 
main.cpp: In function 'int main()':
main.cpp:17:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  std::scanf( "%d", &id );
  ~~~~~~~~~~^~~~~~~~~~~~~
main.cpp:18:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  std::scanf( "%d", &size );
  ~~~~~~~~~~^~~~~~~~~~~~~~~
main.cpp:20:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for( int i = 0; i < size; ++i ) std::scanf( "%d", dat + i );
                                  ~~~~~~~~~~^~~~~~~~~~~~~~~~~
g++ -g -Wall -O2 -o sort.o -c sort.cpp 
g++ -g -Wall -O2 -o main main.o sort.o
finished

clean (3/3): 
finished

all task finished, build successfully