三分

整数

//三分极小值 
int Left, Right;
int mid, midmid;
int mid_value, midmid_value;
Left = minn; Right = maxn;
while (Right - Left > 5)
{
    mid = (Left + Right) / 2;
     midmid = (mid + Right) / 2;
      mid_value = Cal(mid);
       midmid_value = Cal(midmid);
    if (mid_value >= midmid_value) Left = mid;
    else Right = midmid;
}
int ans=Cal(Left) ;
for(int i=Left+1 ;i<=Right ;i++)
    ans=min(ans,Cal(i)) ;
printf("%d\n",ans) ;

//三分极大值 
int Left, Right;
int mid, midmid;
int mid_value, midmid_value;
Left = minn; Right = maxn;
while (Right - Left > 5)
{
    mid = (Left + Right) / 2;
     midmid = (mid + Right) / 2;
      mid_value = Cal(mid);
       midmid_value = Cal(midmid);
    if (mid_value >= midmid_value) Right = midmid;
    else Left = mid;
}
int ans=Cal(Left) ;
for(int i=Left+1 ;i<=Right ;i++)
    ans=max(ans,Cal(i)) ;
printf("%d\n",ans) ;