Compilare: main.cpp: In function 'int main()': main.cpp:38:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<L[c[p]].size();i++){ ~^~~~~~~~~~~~~~~ main.cpp:16:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&m); ^ main.cpp:18:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&cost[i].f); ^ main.cpp:24:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&x,&y); ^