Compilare: main.cpp: In function 'int main()': main.cpp:66:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;last[x]<v[x].size();last[x]++) ~~~~~~~^~~~~~~~~~~~ main.cpp:73:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(last[x]==v[x].size()) ~~~~~~~^~~~~~~~~~~~~ main.cpp:79:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(drum.size()!=n+1) ~~~~~~~~~~~^~~~~ main.cpp:85:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<drum.size()-1;i++) ~^~~~~~~~~~~~~~