Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:42:9: warning: unused variable ‘z’ [-Wunused-variable] int z = -1; ^ user.cpp:44:10: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] bool ok = true; ^ user.cpp: In function ‘void citire()’: user.cpp:15:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:19:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &sir[i][j]); ^ user.cpp: In function ‘int main()’: user.cpp:123:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biperm.in", "r", stdin); ^ user.cpp:124:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biperm.out", "w", stdout); ^