Compilare: user.cpp: In function ‘int main()’: user.cpp:12:10: warning: unused variable ‘j’ [-Wunused-variable] int i, j, st, dr, n; ^ user.cpp:14:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("curcubeu.in", "r", stdin); ^ user.cpp:15:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("curcubeu.out", "w", stdout); ^ user.cpp:17:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i%i%i", &n, &a[1], &b[1], &c[1]); ^