Compilare: user.cpp: In function ‘int main()’: user.cpp:26:9: warning: unused variable ‘lc’ [-Wunused-variable] int lc=0,smax=1000000,nr,ci; ^ user.cpp:26:27: warning: unused variable ‘nr’ [-Wunused-variable] int lc=0,smax=1000000,nr,ci; ^ user.cpp:26:30: warning: unused variable ‘ci’ [-Wunused-variable] int lc=0,smax=1000000,nr,ci; ^ user.cpp:27:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv.in","r",stdin); ^ user.cpp:28:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv.out","w",stdout); ^ user.cpp:30:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:32:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]),v2[i]=v[i]; ^