Compilare: main.cpp: In function 'int main()': main.cpp:51:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t=0;t<v[x.nr].size();t++) ~^~~~~~~~~~~~~~~ main.cpp:25:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&k); ^ main.cpp:28:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&d,&y); ^