Bzoj2882: 工艺

题面

luogu不用权限

Sol

\(sa\)的话就直接连在一起后缀排序就好了
\(sam\)就插入两次，贪心在上面走就好了

# include <bits/stdc++.h>
# define RG register
# define IL inline
# define Fill(a, b) memset(a, b, sizeof(a))
using namespace std;
typedef long long ll;
 
IL int Input(){
    RG int x = 0, z = 1; RG char c = getchar();
    for(; c < '0' || c > '9'; c = getchar()) z = c == '-' ? -1 : 1;
    for(; c >= '0' && c <= '9'; c = getchar()) x = (x << 1) + (x << 3) + (c ^ 48);
    return x * z;
}
 
const int maxn(3e5 + 5);

map <int, int> trans[maxn << 2];
int fa[maxn << 2], tot = 1, last = 1, len[maxn << 2], n, a[maxn];

IL void Extend(RG int c){
	RG int p = last, np = ++tot;
	len[last = np] = len[p] + 1;
	while(p && !trans[p][c]) trans[p][c] = np, p = fa[p];
	if(!p) fa[np] = 1;
	else{
		RG int q = trans[p][c];
		if(len[q] == len[p] + 1) fa[np] = q;
		else{
			RG int nq = ++tot;
			fa[nq] = fa[q], len[nq] = len[p] + 1;
			trans[nq] = trans[q];
			fa[q] = fa[np] = nq;
			while(p && trans[p][c] == q) trans[p][c] = nq, p = fa[p];
		}
	}
}

int main(RG int argc, RG char *argv[]){
	n = Input();
	for(RG int i = 1; i <= n; ++i) Extend(a[i] = Input());
	for(RG int i = 1; i <= n; ++i) Extend(a[i]);
	for(RG int i = 1, nw = 1; i <= n; ++i){
		printf("%d ", trans[nw].begin() -> first);
		nw = trans[nw].begin() -> second;
	}
	return 0;
}