Compilare: user.cpp: In function ‘int main()’: user.cpp:53:9: warning: unused variable ‘t’ [-Wunused-variable] int t,i,j,k,l,x0,y0,x1,y1,xf,yf,xp,yp,q,res=oo; ^ user.cpp:56:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d\n",&N,&M); ^ user.cpp:59:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%s\n",s); ^ user.cpp:79:22: warning: ‘y1’ may be used uninitialized in this function [-Wmaybe-uninitialized] BFS(x1, y1, 1, 1); ^ user.cpp:79:22: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:78:22: warning: ‘y0’ may be used uninitialized in this function [-Wmaybe-uninitialized] BFS(x0, y0, 0, 0); ^ user.cpp:78:22: warning: ‘x0’ may be used uninitialized in this function [-Wmaybe-uninitialized]