prepare (1/3): 
finished

make (2/3): 
gcc -g -Wall -O2 -o main.o -c main.c 
main.c: In function 'main':
main.c:127:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &eSize);
     ^~~~~~~~~~~~~~~~~~~
main.c:128:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &vSize);
     ^~~~~~~~~~~~~~~~~~~
main.c:139:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &u);
         ^~~~~~~~~~~~~~~
main.c:140:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &v);
         ^~~~~~~~~~~~~~~
main.c:141:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &w);
         ^~~~~~~~~~~~~~~
gcc -g -Wall -O2 -o graph.o -c graph.c 
gcc -g -Wall -O2 -o tree.o -c tree.c 
gcc -g -Wall -O2 -o main main.o graph.o tree.o
finished

clean (3/3): 
finished

all task finished, build successfully