Compilare: main.cpp: In function 'int main()': main.cpp:23:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(fr[i].size()>maxx && n-fr[i].size()==i) ~~~~~~~~~~~~^~~~~ main.cpp:23:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(fr[i].size()>maxx && n-fr[i].size()==i) ~~~~~~~~~~~~~~^~~ main.cpp:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<fr[poz].size();i++) ~^~~~~~~~~~~~~~~