Compilare: user.cpp: In function ‘int main()’: user.cpp:30:35: warning: operation on ‘i’ may be undefined [-Wsequence-point] for (i = 1; i <= m; a[i].S = i++) ^ user.cpp:25:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secvente3.in","r",stdin); ^ user.cpp:26:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secvente3.out","w",stdout); ^ user.cpp:28:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &A, &b, &mod, &m); ^ user.cpp:31:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %lld", &a[i].F.F, &a[i].F.S); ^