Compilare: user.cpp: In function ‘int main()’: user.cpp:93:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("suma4.in","r",stdin); ^ user.cpp:94:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("suma4.out","w",stdout); ^ user.cpp:95:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:96:46: 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",&val[i]); ^ user.cpp: In function ‘void construct_dyn()’: user.cpp:89:20: warning: ‘p3’ may be used uninitialized in this function [-Wmaybe-uninitialized] chase(p1,p2,p3); ^ user.cpp:89:20: warning: ‘p2’ may be used uninitialized in this function [-Wmaybe-uninitialized]