Compilare: user.cpp: In function ‘void merge(int)’: user.cpp:15:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s[a[poz]].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:31:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s[q].size()<p) fout<<0<<'\n'; ^ user.cpp:22:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("stramosi.in","r",stdin); ^ user.cpp:23:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:25:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i]); ^ user.cpp:30:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&q,&p); ^