Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:30:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < a[x].size(); i++) ~~^~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:45:12: warning: unused variable 'Min' [-Wunused-variable] int i, Min, j; ^~~ main.cpp:45:17: warning: unused variable 'j' [-Wunused-variable] int i, Min, j; ^