Compilare: user.cpp: In function ‘int bfs()’: user.cpp:102:14: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(!viz[i]) ^ user.cpp: In function ‘void read()’: user.cpp:38:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&n1,&n2,&m); ^ user.cpp:46:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&x,&y); ^