Compilare: user.cpp: In function ‘int main()’: user.cpp:80:10: warning: unused variable ‘edges’ [-Wunused-variable] long edges, i, j, answer = 0; ^ user.cpp:81:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &n, &m); ^ user.cpp:85:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%ld", &j); ^