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:179:14: warning: unused variable 'deleted' [-Wunused-variable]
         bool deleted=false;
              ^~~~~~~
main.cpp:180:13: warning: unused variable 'm' [-Wunused-variable]
         int m=0;
             ^
main.cpp:181:13: warning: unused variable 'n' [-Wunused-variable]
         int n=0;
             ^
g++ -g -Wall -O2 -o main main.o
finished

clean (3/3): 
finished

all task finished, build successfully