Compilare: user.cpp: In function ‘void solve()’: user.cpp:69:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘bool dfs(int)’: user.cpp:103:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (!viz[aux->nr]) ^ user.cpp: In function ‘void read()’: user.cpp:34:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(cin,"%d %d",&N,&M); ^ user.cpp:37:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(cin,"%d",&E); ^ user.cpp:40:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(cin,"%d %d",&x,&y); ^