Compilare: user.cpp: In function ‘int update(int, int, int, int, int)’: user.cpp:16:45: warning: control reaches end of non-void function [-Wreturn-type] maxim[nod]=max(maxim[nod*2],maxim[nod*2+1]);} ^ user.cpp: In function ‘int main()’: user.cpp:36:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sir.in","r",stdin); ^ user.cpp:37:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sir.out","w",stdout); ^ user.cpp:39:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&x,&y,&z); ^ user.cpp:41:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&nr); ^