Compilare: main.cpp: In function 'int main()': main.cpp:32:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();j++) ~^~~~~~~~~~~~ main.cpp:35:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==v[i].size())continue; ~^~~~~~~~~~~~~ main.cpp:36:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;j<v[i].size();j++) ~^~~~~~~~~~~~