Compilare: main.cpp: In function 'int main()': main.cpp:22:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<t[i].size();j++) ~^~~~~~~~~~~~ main.cpp:29:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h=0;h<t[z].size();h++) ~^~~~~~~~~~~~