Compilare: main.cpp: In function 'int main()': main.cpp:128:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<v[i].size();j++) ~^~~~~~~~~~~~ main.cpp:151:13: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int j=1;j<=len;j++) ^~~ main.cpp:152:134: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' g<<struc[j].first.first<<' '<<struc[j].first.second<<" : "<<struc[j].second.first<<' '<<struc[j].second.second<<'\n';g<<'\n'; ^