Compilare: user.cpp: In function ‘int main()’: user.cpp:18:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=m;++i) ^ user.cpp:22:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(val*val<=n and i<=m) ^ user.cpp:22:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(val*val<=n and i<=m) ^ user.cpp:31:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=val+1;j<=n;++j) ^ user.cpp:33:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=n;++j) ^ user.cpp:40:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<=m;++i) ^ user.cpp:48:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;++i) ^