Compilare: main.cpp: In function 'bool bfs(int)': main.cpp:15:26: warning: suggest parentheses around assignment used as truth value [-Wparentheses] viz[i] = tata[i] = 0; ~~~~~~~~^~~ main.cpp:22:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[node].size(); i++) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void bfs2(int)': main.cpp:43:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[node].size(); i++) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:67:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < graph[n].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp:92:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < graph[i].size(); j++) ~~^~~~~~~~~~~~~~~~~