Compilare: user.cpp: In function ‘int main()’: user.cpp:62:21: warning: variable ‘A1’ set but not used [-Wunused-but-set-variable] int i, m, a, b, A1, A2, B1, B2, lim, ans = 0, left; ^ user.cpp:62:33: warning: variable ‘B2’ set but not used [-Wunused-but-set-variable] int i, m, a, b, A1, A2, B1, B2, lim, ans = 0, left; ^ user.cpp:66:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("strazi.in", "r", stdin); ^ user.cpp:67:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("strazi.out", "w", stdout); ^ user.cpp:69:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &n, &m); ^ user.cpp:73:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &a, &b); ^