Compilare: user.cpp: In function ‘void QS(int, int)’: user.cpp:16:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[i]<x)i++; ^ user.cpp:17:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[j]>x)j--; ^ user.cpp: In function ‘int main()’: user.cpp:31:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("filme.in","r",stdin); ^ user.cpp:32:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("filme.out","w",stdout); ^