Compilare: user.cpp: In function ‘int main()’: user.cpp:96:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<vs[ivs][is].size();i++) ^ user.cpp:107:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (l=0;l<vs[1][is].size();l++) ^ user.cpp:108:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (r=l;r<vs[1][is].size();r++) ^ user.cpp:114:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (l=0;l<vs[0][is].size();l++) ^ user.cpp:115:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (r=l;r<vs[0][is].size();r++) ^