Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:77:9: warning: unused variable ‘st’ [-Wunused-variable] int st, dr; ^ user.cpp:77:13: warning: unused variable ‘dr’ [-Wunused-variable] int st, dr; ^ user.cpp: In function ‘void readFile()’: user.cpp:56:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &m); ^ user.cpp:62:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &a, &b); ^