Compilare: main.cpp: In function 'int main()': main.cpp:18:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[p].size()!=i) ~~~~~~~~~~~^~~ main.cpp:21:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(v[p].size()!=i) ~~~~~~~~~~~^~~ main.cpp:35:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(v[i].size()!=n) ~~~~~~~~~~~^~~