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) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:98:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &u, &v); ^