Compilare: user.cpp: In function ‘int main()’: user.cpp:19:15: warning: unused variable ‘j’ [-Wunused-variable] int n, i, j, s, t, k, id, ma, mi, begi, endi; ^ user.cpp:19:18: warning: unused variable ‘s’ [-Wunused-variable] int n, i, j, s, t, k, id, ma, mi, begi, endi; ^ user.cpp:16:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv2.in","r",stdin); ^ user.cpp:17:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv2.out","w",stdout); ^ user.cpp:24:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:27:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^