Compilare: user.cpp: In function ‘int main()’: user.cpp:55:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("compact.in","r",stdin); ^ user.cpp:56:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("compact.out","w",stdout); ^ user.cpp:57:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:59:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^ user.cpp: In function ‘void Dfs(int)’: user.cpp:46:18: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans+=(top-sol); ^ user.cpp:46:18: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:46:18: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:46:18: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:46:18: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:46:18: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:46:18: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:46:18: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:46:18: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized]