Compilare: main.cpp: In function 'int main()': main.cpp:56:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (nr[i].size() < lim){ ~~~~~~~~~~~~~^~~~~ main.cpp:57:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<nr[i].size(); j++){ ~^~~~~~~~~~~~~ main.cpp:58:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k=j; k<nr[i].size(); k++){ ~^~~~~~~~~~~~~