Compilare: user.cpp: In function ‘int main()’: user.cpp:42:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < l[h].size(); j++) ^ user.cpp:22:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ user.cpp:25:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&x,&y,&c); ^ user.cpp:44:38: warning: ‘h’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(d[l[h][j].first] > d[h] + l[h][j].second) ^