Compilare: user.cpp: In function ‘int main()’: user.cpp:20:23: warning: format ‘%ld’ expects argument of type ‘long int*’, but argument 3 has type ‘LL* {aka long long int*}’ [-Wformat=] scanf("%d%ld", &n, &b); ^ user.cpp:18:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("file.in", "r", stdin); ^ user.cpp:19:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("file.out", "w", stdout); ^ user.cpp:20:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%ld", &n, &b); ^ user.cpp:21:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1;i<=n;i++) scanf("%d", &p[i]); ^