Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:28:9: warning: unused variable ‘i’ [-Wunused-variable] int i, node, valx; ^ user.cpp:28:18: warning: variable ‘valx’ set but not used [-Wunused-but-set-variable] int i, node, valx; ^ user.cpp: In function ‘void read()’: user.cpp:18:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cinema.in", "r", stdin); ^ user.cpp:19:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:24:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] val[v[i]] = i; ^ user.cpp: In function ‘void write()’: user.cpp:61:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cinema.out", "w", stdout); ^