Compilare: main.cpp: In function 'void Prim(int)': main.cpp:30:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph[start].size();i++){ ~^~~~~~~~~~~~~~~~~~~~ main.cpp:44:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph[index].size();i++){ ~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void Read()': main.cpp:18:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ main.cpp:20:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&aux1,&aux2,&cost); ^