Compilare: main.cpp: In function 'int main()': main.cpp:59:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (posb < num.size()) { ~~~~~^~~~~~~~~~~~ main.cpp:60:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (poss < num.size() && num[poss].val >= num[posb].val - nrp) { ~~~~~^~~~~~~~~~~~ main.cpp:76:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (posb < num.size() && num[posb].val == num[posi].val) { ~~~~~^~~~~~~~~~~~