Compilare: user.cpp: In function ‘void Mergesort(int*, int, int, int)’: user.cpp:23:23: warning: statement has no effect [-Wunused-value] if (i<=mij) for (i;i<=mij;i++) V[++k]=v[i];else ^ user.cpp:24:15: warning: statement has no effect [-Wunused-value] for (j;j<=dr;j++) V[++k]=v[j]; ^ user.cpp: In function ‘int main()’: user.cpp:39:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("costperm.in","r",stdin); ^ user.cpp:40:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("costperm.out","w",stdout); ^ user.cpp:41:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:43:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^