Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:103:41: warning: variable ‘wmax3’ set but not used [-Wunused-but-set-variable] int wmax3, wmin3; ^~~~~ user.cpp:103:48: warning: variable ‘wmin3’ set but not used [-Wunused-but-set-variable] int wmax3, wmin3; ^~~~~ user.cpp: In function ‘int main()’: user.cpp:126:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("comp.in", "r", stdin); ^ user.cpp:127:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("comp.out", "w", stdout); ^ user.cpp:128:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:131:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^