• Hdu 4622 Reincarnation(后缀自动机)


    /*
    字符串长度较小, 可以离线或者直接与处理所有区间的答案 
    动态加入点的时候, 因为对于其他点的parent构造要么没有影响, 要么就是在两个节点之间塞入一个点, 对于minmax的贡献没有改变
    所以只统计这个点的贡献就好了 
    */
    #include<cstdio>
    #include<algorithm>
    #include<iostream>
    #include<cstring>
    #include<queue>
    #define ll long long 
    #define M 4040
    #define mmp make_pair
    using namespace std;
    int read()
    {
    	int nm = 0, f = 1;
    	char c = getchar();
    	for(; !isdigit(c); c = getchar()) if(c == '-') f = -1;
    	for(; isdigit(c); c = getchar()) nm = nm * 10 + c - '0';
    	return nm * f;
    }
    
    int len[M], fa[M], ch[M][26], lst, cnt;
    int ans[2020][2020];
    char s[M];
    
    void init()
    {
    	memset(len, 0, sizeof(len));
    	memset(ch, 0, sizeof(ch));
    	memset(fa, 0, sizeof(fa));
    	lst = cnt = 1;
    }
    
    void insert(int c)
    {
    	int p = ++cnt, f = lst;
    	lst = p;
    	len[p] = len[f] + 1;
    	while(f && !ch[f][c]) ch[f][c] = p, f = fa[f];
    	if(!f) fa[p] = 1;
    	else
    	{
    		int q = ch[f][c];
    		if(len[q] == len[f] + 1) fa[p] = q;
    		else
    		{
    			int nq = ++cnt;
    			fa[nq] = fa[q];
    			memcpy(ch[nq], ch[q], sizeof(ch[nq]));
    			len[nq] = len[f] + 1;
    			fa[p] = fa[q] = nq;
    			while(f && ch[f][c] == q) ch[f][c] = nq, f = fa[f];
    		}
    	}
    }
    int main()
    {
    	int t = read();
    	while(t--)
    	{
    		//Init();
    		scanf("%s", s + 1);
    		int n = strlen(s + 1);
    		for(int i = 1; i <= n; i++)
    		{
    			init();
    			for(int j = i; j <= n; j++) insert(s[j] - 'a'), ans[i][j] = ans[i][j - 1] + len[lst] - len[fa[lst]];
    		}
    		int q = read();
    		while(q--)
    		{
    			int l = read(), r = read();
    			cout << ans[l][r] << "
    ";
    		}
    	}
    	return 0;
    }
    
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  • 原文地址:https://www.cnblogs.com/luoyibujue/p/10612731.html
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