Compilare: user.cpp: In function ‘int main()’: user.cpp:39:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<newo.size()-1;++i){ ^ user.cpp:41:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (newo[i] == newo[j] && j < newo.size()) ++j; ^ user.cpp:17:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("pluton.in", "r", stdin); ^ user.cpp:18:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("pluton.out", "w", stdout); ^ user.cpp:20:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int nrp = 0; scanf ("%d",&n); ^ user.cpp:22:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &ar[i]); ^ user.cpp:48:34: warning: ‘Q’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (i=1;i<=n;i++) if (s[Q][ar[i]]) printf ("%d ", ar[i]); ^