Compilare: user.cpp: In function ‘int main()’: user.cpp:51:40: warning: unused variable ‘ki’ [-Wunused-variable] FILE *be = fopen("kbetray.in", "r"), *ki = fopen("kbetray.out", "w"); ^ user.cpp:54:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(be, "%i%i", &n, &k); ^ user.cpp:57:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(be, "%i%i", &a, &b); ^