Compilare: user.cpp: In function ‘int main()’: user.cpp:46:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<r.size()/2;i++) ^ user.cpp:56:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=r.size();j++) ^ user.cpp:67:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<r2.size()/2;i++) ^ user.cpp:77:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=r2.size();j++) ^ user.cpp:88:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<r.size()/2;i++) ^ user.cpp:93:53: 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:94:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else {g<<r2.size()<<" ";for(i=0;i<r2.size();i++) g<<r2[i]<<" ";} ^