Compilare: user.cpp: In function ‘int main()’: user.cpp:9:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pluton.in","r",stdin); ^ user.cpp:10:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pluton.out","w",stdout); ^ user.cpp:12:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:15:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ user.cpp:41:5: warning: ‘ir’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i=1;i<=ir;i++) printf("%d ",v3[i]); ^ user.cpp:38:33: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(r>maxx) {maxx=r;r2=1;for(int j=1;j<=l;j++) v3[j]=v2[j];ir=l;} ^