Compilare: main.cpp: In function 'void vecini()': main.cpp:37:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < puncte_pe_linie[x].size(); ++i) { ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:38:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < puncte_pe_linie[x].size() - 1) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:47:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < puncte_pe_coloana[x].size(); ++i) { ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:48:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < puncte_pe_coloana[x].size() - 1) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~