Compilare: user.cpp: In function ‘bool BFS1(int)’: user.cpp:17:9: warning: unused variable ‘x’ [-Wunused-variable] int x,b,e,nod; ^ user.cpp: In function ‘void BFS2(int, int)’: user.cpp:38:9: warning: unused variable ‘x’ [-Wunused-variable] int x,b,e,nod; ^ user.cpp: In function ‘int main()’: user.cpp:55:35: warning: unused variable ‘y’ [-Wunused-variable] int i,n,m,a,b,c,nod,min,ans,j,y; ^ user.cpp:58:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&n,&m); ^ user.cpp:60:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d %d " ,&a,&b,&c); ^