Compilare: main.cpp: In function 'void dijkstra()': main.cpp:38:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[acn].size();j++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:56:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&N,&M); ^ main.cpp:59:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&A,&B,&C); ^