Compilare: main.cpp: In function 'bool cuplaj(int)': main.cpp:100:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[x].size(); i++) { ~~^~~~~~~~~~~~~ main.cpp:108:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[x].size(); i++) { ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:171:21: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized] for (int i = 0; i <= k; i++) { ~~^~~~