Compilare: main.cpp: In function 'int main()': main.cpp:36:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos1 < L[i].size() && pos2 < L[j].size()){ ~~~~~^~~~~~~~~~~~~ main.cpp:36:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos1 < L[i].size() && pos2 < L[j].size()){ ~~~~~^~~~~~~~~~~~~ main.cpp:47:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;pos1<L[i].size();pos1++) ~~~~^~~~~~~~~~~~ main.cpp:50:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;pos2<L[j].size();pos2++) ~~~~^~~~~~~~~~~~ main.cpp:57:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (idx < aux.size()){ ~~~~^~~~~~~~~~~~ main.cpp:60:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (idx < aux.size() && aux[idx].first <= last+1){ ~~~~^~~~~~~~~~~~