Compilare: main.cpp: In function 'void dfs(int)': main.cpp:17:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < graph[node].size ( ); i++ ){ ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:32:28: 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:55:27: warning: suggest parentheses around assignment used as truth value [-Wparentheses] viz[i] = d[i] = used[i] = 0; ~~~~~^~~~~~~~~~~~~