Compilare: user.cpp: In function ‘bool BellmanFord(int, int)’: user.cpp:108:18: warning: unused variable ‘a’ [-Wunused-variable] int a=i->first,b=i->second; ^ user.cpp:108:29: warning: unused variable ‘b’ [-Wunused-variable] int a=i->first,b=i->second; ^ user.cpp: In function ‘int main()’: user.cpp:136:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d ",&n,&m); ^ user.cpp:139:71: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d ",&muchii[i].x,&muchii[i].y,&muchii[i].cost); ^