Compilare: main.cpp: In function 'void dfs(int)': main.cpp:28:17: warning: unused variable 'mc' [-Wunused-variable] int mc=*it; ^~ main.cpp: In function 'int main()': main.cpp:45:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^ main.cpp:48:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&x,&y); ^