Compilare: user.cpp: In function ‘void prim(int)’: user.cpp:13:11: warning: unused variable ‘nr’ [-Wunused-variable] int i, j,nr=1; ^ user.cpp: In function ‘int main()’: user.cpp:51:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("amp.in", "r", stdin); ^ user.cpp:52:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("amp.out", "w", stdout); ^ user.cpp:53:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d ", &n); ^ user.cpp: In function ‘void prim(int)’: user.cpp:42:22: warning: ‘pmin’ may be used uninitialized in this function [-Wmaybe-uninitialized] parinte[i] = pmin; ^