Compilare: main.cpp: In function 'void dfs(int)': main.cpp:18:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < a[x].size(); i++) ~~^~~~~~~~~~~~~ main.cpp:23:23: 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:42:12: warning: 'boss' may be used uninitialized in this function [-Wmaybe-uninitialized] int i, boss; ^~~~