Compilare: user.cpp: In function ‘std::vector<int> ms(int, int)’: user.cpp:29:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size () || j < b.size ()) ^ user.cpp:29:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size () || j < b.size ()) ^ user.cpp:31:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < a.size () && (j == b.size () || a[i] < b[j])) ^ user.cpp:31:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < a.size () && (j == b.size () || a[i] < b[j])) ^ user.cpp: In function ‘int main()’: user.cpp:42:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("algsort.in", "r", stdin); ^ user.cpp:43:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("algsort.out", "w", stdout); ^ user.cpp:46:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &n); ^ user.cpp:49:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &v[i]); ^