Compilare: main.cpp: In function 'int main()': main.cpp:41:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<ad[node].size();i++) { ~^~~~~~~~~~~~~~~~ main.cpp:30:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d\n", &n, &m); ^ main.cpp:32:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d\n", &a, &b, &c); ^