Compilare: main.cpp: In function 'void Dijkstra()': main.cpp:50:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<graph[node].size(); ++i) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void BuildTree()': main.cpp:96:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<edge.size(); ++i) ~^~~~~~~~~~~~ main.cpp:100:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<graph[node].size(); ++j) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void Query()': main.cpp:137:25: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized] g<<max(0,ans-time)<<'\n'; ~~~^~~~~