Compilare: user.cpp: In function ‘int main()’: user.cpp:23:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("reversez.in", "r", stdin); ^ user.cpp:24:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("reversez.out", "w", stdout); ^ user.cpp:26:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &N, &sigma), mod = 666013; ^ user.cpp:28:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &l[i]), t[i] = i, sml[i] = N + 1; ^ user.cpp:33:47: warning: ‘P’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (R >= i) pl = min (R - i + 1, l[P - (i - P)]); ^