Compilare: main.cpp: In function 'void dfs(int)': main.cpp:26:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:53:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[i]<s[i].size() && l<=nr){ ~~~~^~~~~~~~~~~~ main.cpp:62:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[i]<2*s[i].size() && l<=nr){ ~~~~^~~~~~~~~~~~~~