Compilare: main.cpp: In function 'void read()': main.cpp:28:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[x].size() > Max) { ~~~~~~~~~~~~^~~~~ main.cpp: In function 'void dfs(int, int)': main.cpp:48:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < a[x].size(); i++) ~~^~~~~~~~~~~~~ main.cpp:55:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < a[x].size(); i++) ~~^~~~~~~~~~~~~ main.cpp:45:8: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if (imp[x] && px != 0) ^