51 lines
837 B
C++
51 lines
837 B
C++
#include <iostream>
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#include <cstring>
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#include <string>
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#include <map>
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#include <queue>
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#include <algorithm>
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using namespace std;
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char s[211000],c[111000];
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int p[211000];
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void init()
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{
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int i,j;
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s[0]='@';
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for(i=0;c[i]!=0;i++)
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{
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s[2*i+1]='#';
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s[2*i+2]=c[i];
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}
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s[2*i+1]='#';
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s[2*i+2]=0;
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}
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int manacher()
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{
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int id=0,mx=0,i;
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for(i=1;s[i]!=0;i++)
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{
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p[i]=mx>i?min(p[2*id-i],mx-i):1;
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while(s[i+p[i]] == s[i-p[i]])p[i]++;
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if(i+p[i]>mx)
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{
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mx=i+p[i];
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id=i;
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}
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}
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mx=0;
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for(i=1;s[i]!=0;i++)
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{
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if(p[i]>mx)mx=p[i];
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}
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return mx-1;
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}
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int main()
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{
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while(~scanf("%s",c))
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{
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init();
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printf("%d\n",manacher());
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}
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return 0;
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}
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