Compilare: user.cpp: In function ‘int main()’: user.cpp:45:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.in","r",stdin); ^ user.cpp:46:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.out","w",stdout); ^ user.cpp: In function ‘void scanfvect(int*, int&)’: user.cpp:7:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:9:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ user.cpp: In function ‘void quicksort(int*, int, int)’: user.cpp:36:5: warning: ‘m2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(s<=d) ^ user.cpp:39:26: warning: ‘m1’ may be used uninitialized in this function [-Wmaybe-uninitialized] quicksort(v,s,m1); ^