Compilare: main.cpp: In function 'void unite(int, int)': main.cpp:43:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<ad[rx].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:83:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[nod].size();j++){ ~^~~~~~~~~~~~~~ main.cpp:90:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (p=0;p<ad[rv].size();p++){ ~^~~~~~~~~~~~~~ main.cpp:60:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&k); ^ main.cpp:62:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&val[i].first); ^ main.cpp:70:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&x,&y); ^