Compilare: user.cpp: In function ‘int bfs()’: user.cpp:12:21: warning: unused variable ‘j’ [-Wunused-variable] int u=1,p=1,e,i,j; ^ user.cpp: In function ‘int main()’: user.cpp:32:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d%d",&m,&n,&x,&y); ^ user.cpp:36:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&a,&b); ^