Compilare: user.cpp: In function ‘int main()’: user.cpp:39:18: warning: unused variable ‘nr’ [-Wunused-variable] int n, d, i, nr; ^ user.cpp:37:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pascal.in", "r", stdin); ^ user.cpp:38:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pascal.out", "w", stdout); ^ user.cpp:40:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &d); ^ user.cpp: In function ‘int ver6(int, char*, char*)’: user.cpp:28:15: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] y = y + v2[n - i + 1] - v2[i]; ^