Compilare: user.cpp: In function ‘int main()’: user.cpp:43:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int k = 0 ; k < v[old_node].size(); k ++ ) ~~^~~~~~~~~~~~~~~~~~~~ user.cpp:49:23: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if(dist[new_node]!=INF) ^~ user.cpp:51:24: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ dist[new_node]=old_cost+new_cost; ^~~~