Compilare: user.cpp: In function ‘int main()’: user.cpp:13:9: warning: unused variable ‘k1’ [-Wunused-variable] int k1 = 0; ^ user.cpp:11:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &n, &k, &a, &b); ^ user.cpp:15:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &cit); ^