【Tsinsen 1280】最长双回文串

题目传送门:http://www.tsinsen.com/ViewGProblem.page?gpid=A1280
离线版题目:http://paste.ubuntu.com/17832836/

参考BZOJ_3676

#include<iostream>
#include<cstdio>
#include<cstring>
#include
<map>
using namespace std;

const int MAXN = 200000+9;
char pat[MAXN],BUF[MAXN/2];
int n,len[MAXN],vout;

map<int,int>::iterator itr;
map<int,int> Q;

inline void manacher(){
    int mx = 0;
    for (int i=1;i<=n;i++){ if (mx+len[mx] > i) len[i] = min(len[mx*2-i],mx+len[mx]-i);
        else len[i] = 0;
        while (pat[i+len[i]+1] == pat[i-len[i]-1]) len[i]++;
        if (len[i]+i > len[mx]+mx) mx = i;
    }
}

inline void init(){
    scanf("%s",BUF+1);
    n = strlen(BUF+1); vout = 2;
    for (int i=1;i<=n;i++){
        pat[i*2-1] = '*';
        pat[i*2] = BUF[i];
    } pat[n*2+1] = '*';
    n=n*2+1; pat[0]='@'; pat[n+1]='&';
}

inline void solve(){
    for (int i=1;i<=n;i++){ itr = Q.lower_bound(i-len[i]); if (itr != Q.end()){ int p = itr->second;
            vout = max(vout,i-p);
        }
         
        if ((Q.insert(make_pair(i+len[i], i))).second){
            itr = Q.find(i+len[i]);
            if (i >= (++itr)->second && itr != Q.end()) Q.erase(--itr);  
            else{
                itr--;
                while (itr != Q.begin() && (--itr)->second >= i) Q.erase(itr), itr=Q.find(i+len[i]);
            }
        }
    }
}

int main(){
    init();
    manacher();
    solve();
    printf("%d\n",vout);
    return 0;
}

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