Compilare: user.cpp: In function ‘int main()’: user.cpp:22:23: warning: format ‘%ld’ expects argument of type ‘long int*’, but argument 2 has type ‘int*’ [-Wformat=] scanf("%ld",&x); ^ user.cpp:13:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sum.in","r",stdin); ^ user.cpp:14:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sum.out","w",stdout); ^ user.cpp:19:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld",&n); ^ user.cpp:22:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld",&x); ^ user.cpp:17:16: warning: iteration 100008 invokes undefined behavior [-Waggressive-loop-optimizations] if (v[i]==i) ~~~^ user.cpp:16:19: note: within this loop for (int i=2;i<=t;i++) ^ user.cpp:15:32: warning: iteration 100009 invokes undefined behavior [-Waggressive-loop-optimizations] for (int i=1;i<=t;i++) v[i]=i; ~~~~^~ user.cpp:15:19: note: within this loop for (int i=1;i<=t;i++) v[i]=i; ^