Compilare: user.cpp: In function ‘int main()’: user.cpp:23:21: warning: unused variable ‘from’ [-Wunused-variable] int from = i - j; ^ user.cpp:10:24: warning: unused variable ‘k’ [-Wunused-variable] register int i, j, k; ^ user.cpp:11:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fractii2.in", "r", stdin); ^ user.cpp:12:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fractii2.out", "w", stdout); ^ user.cpp:13:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &p, &N); ^