Compilare: main.cpp: In function 'void input()': main.cpp:16:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < s.size(); ++i) { ~~^~~~~~~~~~ main.cpp: In function 'std::vector<int> opi(std::vector<int>, std::vector<int>)': main.cpp:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); ++i) { ~~^~~~~~~~~~ main.cpp:44:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (posb < b.size() && b[posb] <= a[i]) { ~~~~~^~~~~~~~~~ main.cpp: In function 'std::vector<int> opr(std::vector<int>, std::vector<int>)': main.cpp:56:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (posa < a.size() && posb < b.size()) { ~~~~~^~~~~~~~~~ main.cpp:56:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (posa < a.size() && posb < b.size()) { ~~~~~^~~~~~~~~~ main.cpp:68:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (posa < a.size()) { ~~~~~^~~~~~~~~~ main.cpp:73:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (posb < b.size()) { ~~~~~^~~~~~~~~~ main.cpp: In function 'std::vector<int> termen()': main.cpp:88:20: warning: array subscript has type 'char' [-Wchar-subscripts] return m[e[pos]]; ^ main.cpp: In function 'int main()': main.cpp:115:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < rez.size(); ++i) ~~^~~~~~~~~~~~