Compilare: user.cpp: In function ‘int main()’: user.cpp:39:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<r.size()/2;i++) ^ user.cpp:48:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=r.size();j++) ^ user.cpp:66:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<r2.size()/2;i++) ^ user.cpp:74:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=r2.size();j++) ^ user.cpp:92:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<r.size()/2;i++) ^ user.cpp:97:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(r.size()) {g<<r.size()<<" ";for(i=0;i<r.size();i++) g<<r[i]<<" ";} ^ user.cpp:98:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else {g<<r2.size()<<" ";for(i=0;i<r2.size();i++) g<<r2[i]<<" ";} ^