Compilare: main.cpp: In function 'void dijkstra(int)': main.cpp:30:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<nod[a.second].size(); i++) ~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:63:58: warning: operation on 'nr' may be undefined [-Wsequence-point] for(int mask=1; mask<(1<<(k-1)); mask*=2) dp[mask][nr++] = dist[0][nr+1]; ~~^~