Compilare: user.cpp: In function ‘int main()’: user.cpp:53:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<newo.size()-1;++i){ ^ user.cpp:56:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (newo[i] == newo[j] && j < newo.size()) ++j; ^ user.cpp:31:38: 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:32:40: 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:34:36: 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:36:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &ar[i]); ^ user.cpp:62:37: warning: ‘Q’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (i=1;i<=n;i++) if (equal(Q,ar[i])) printf ("%d ", ar[i]); ^