Compilare: main.cpp: In function 'void disj(int)': main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<g[a].size();i++) { ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:42:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d" ,&n ,&m ,&k); ^ main.cpp:44:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d" ,&a); ^ main.cpp:48:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d" ,&a ,&b ,&c); ^