bzoj3790 神奇项链

#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
char s0[50050],s[100050];
int len,n,p[100050];
struct node
{
    int l,r;
}d[100050];
void manacher()
{
    int mid = 0,mx = 0;
    for(int i=1;i<=n;i++)
    {
        if(i<=mx)p[i]=min(p[2*mid-i],mx-i+1);
        else p[i]=1;
        while(s[i+p[i]]==s[i-p[i]])p[i]++;
        d[i].l=i-p[i]+1,d[i].r=i+p[i]-1;
        if(i+p[i]-1>mx)
        {
            mid=i;
            mx=i+p[i]-1;
        }
    }
}
bool cmp(node a,node b)
{
    if(a.l!=b.l)return a.l<b.l;
    return a.r<b.r;
}
int main()
{
    while(scanf("%s",s0+1)>0)
    {
        len = strlen(s0+1);
        s[0]=‘!‘,n=0;
        for(int i=1;i<=len;i++)
        {
            s[++n]=‘#‘;
            s[++n]=s0[i];
        }
        s[++n]=‘#‘,s[n+1]=‘@‘;
        manacher();
        sort(d+1,d+n+1,cmp);
        int cnt = 0,now = 0,mxr=0;
        for(int i=1;i<=n&&now!=n;)
        {
            mxr=0;
            while(d[i].l<=now+1)mxr=max(mxr,d[i].r),i++;
            i--;
            cnt++;
            now=mxr;
        }
        printf("%d\n",cnt-1);
    }
    return 0;
}