Compilare: main.cpp: In function 'int dijkstra(int)': main.cpp:21:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<a[x].size();j++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:35:1: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i=1;i<=n;i++) ^~~ main.cpp:39:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' return 0; ^~~~~~