Compilare: user.cpp: In member function ‘bool MyComp::operator()(const ELEMENT&, const ELEMENT&)’: user.cpp:16:13: warning: statement has no effect [-Wunused-value] A.v < B.v; ^ user.cpp:17:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:89:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("trib.in", "r", stdin); ^ user.cpp:90:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("trib.out", "w", stdout); ^ user.cpp:92:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &n); ^ user.cpp:94:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &x, &y); ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:76:9: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (i < poz) ^