Compilare: main.cpp: In function 'int main()': main.cpp:60:18: warning: operation on 'K' may be undefined [-Wsequence-point] Fool[++K] = K; ^~~ main.cpp:82:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos < Comp[L].size() - 1) ~~~~^~~~~~~~~~~~~~~~~~~~ main.cpp:84:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (pos == Comp[L].size() - 1) ~~~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:86:50: warning: operation on 'L' may be undefined [-Wsequence-point] Vertex.push_back({Comp[L][pos], Comp[++L][0]}); ^~~ main.cpp:92:48: warning: operation on 'L' may be undefined [-Wsequence-point] Vertex.push_back({Comp[L][0], Comp[++L][0]}); ^~~