Compilare: main.cpp: In function 'void print()': main.cpp:17:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sol[0].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:127:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<toelim[i].size(); j++) { ~^~~~~~~~~~~~~~~~~