Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < V[nod].size(); ++ i) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:82:29: warning: format '%s' expects argument of type 'char*', but argument 3 has type 'char (*)[500002]' [-Wformat=] scanf("%d\n%s\n", &n, &S); ^ main.cpp:82:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n%s\n", &n, &S); ^ main.cpp:93:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &u, &v); ^