Compilare: main.cpp: In function 'void dp_dfs(int, int)': main.cpp:33:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[x].size (); i++) { ~~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int, int, int, int)': main.cpp:71:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[x].size (); i++) { ~~^~~~~~~~~~~~~~ main.cpp:75:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i != g[x].size () - 1) { ~~^~~~~~~~~~~~~~~~~~~