Compilare: main.cpp: In function 'int main()': main.cpp:58:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos1 < L[t1].size() && pos2 < L[t2].size()){ ~~~~~^~~~~~~~~~~~~~ main.cpp:58:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos1 < L[t1].size() && pos2 < L[t2].size()){ ~~~~~^~~~~~~~~~~~~~ main.cpp:73:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;pos1<L[t1].size();pos1++){ ~~~~^~~~~~~~~~~~~ main.cpp:79:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;pos2<L[t2].size();pos2++){ ~~~~^~~~~~~~~~~~~