From fe5fa1141efeb7454c763dbd2645fb4ff04487a3 Mon Sep 17 00:00:00 2001
From: mzuenni <michi.zuendorf@gmail.com>
Date: Tue, 28 Mar 2023 13:25:59 +0200
Subject: merged

---
 string/suffixAutomaton.cpp | 42 +++++++++++++++++++++---------------------
 1 file changed, 21 insertions(+), 21 deletions(-)

(limited to 'string/suffixAutomaton.cpp')

diff --git a/string/suffixAutomaton.cpp b/string/suffixAutomaton.cpp
index 8b79822..4cc2a92 100644
--- a/string/suffixAutomaton.cpp
+++ b/string/suffixAutomaton.cpp
@@ -3,57 +3,57 @@ constexpr char OFFSET = 'a';
 struct SuffixAutomaton {
 	struct State {
 		int len, link = -1;
-		int nxt[ALPHABET_SIZE] = {}; // map if large Alphabet
+		array<int, ALPHABET_SIZE> next = {}; // map if large Alphabet
 		State(int l) : len(l) {}
 	};
 
-	vector<State> st{0};
-	int last = 0;
+	vector<State> st = {State(0)};
+	int cur = 0;
 
-	SuffixAutomaton(const string &s) {
+	SuffixAutomaton(const string& s) {
 		st.reserve(2 * sz(s));
 		for (auto c : s) extend(c - OFFSET);
 	}
 
 	void extend(int c) {
-		st.emplace_back(st[last].len + 1);
-		int p = last, cur = last = sz(st) - 1;
-		for (; p != -1 && !st[p].nxt[c]; p = st[p].link) {
-			st[p].nxt[c] = cur;
+		int p = cur;
+		int cur = sz(st);
+		st.emplace_back(st[p].len + 1);
+		for (; p != -1 && !st[p].next[c]; p = st[p].link) {
+			st[p].next[c] = cur;
 		}
 		if (p == -1) st[cur].link = 0;
 		else {
-			int q = st[p].nxt[c];
+			int q = st[p].next[c];
 			if (st[p].len + 1 == st[q].len) {
 				st[cur].link = q;
 			} else {
 				st.emplace_back(st[p].len + 1);
 				st.back().link = st[q].link;
-				copy(all(st[q].nxt), st.back().nxt); // back.nxt=[q].nxt
-				for (; p != -1 && st[p].nxt[c] == q; p = st[p].link) {
-					st[p].nxt[c] = sz(st) - 1;
+				st.back().next = st[q].next;
+				for (; p != -1 && st[p].next[c] == q; p = st[p].link) {
+					st[p].next[c] = sz(st) - 1;
 				}
 				st[q].link = st[cur].link = sz(st) - 1;
-		}}
-	}
+	}}}
 
 	vector<int> calculateTerminals() {
 		vector<int> terminals;
-		for (int p = last; p != -1; p = st[p].link) {
+		for (int p = cur; p != -1; p = st[p].link) {
 			terminals.push_back(p);
 		}
 		return terminals;
 	}
 
 	// Pair with start index (in t) and length of LCS.
-	pair<int, int> longestCommonSubstring(const string &t) {
-		int v = 0, l = 0, best = 0, bestpos = 0;
+	pair<int, int> longestCommonSubstring(const string& t) {
+		int v = 0, l = 0, best = 0, bestp = 0;
 		for (int i = 0; i < sz(t); i++) {
 			int c = t[i] - OFFSET;
-			for (; v && !st[v].nxt[c]; v = st[v].link) l = st[v].len;
-			if (st[v].nxt[c]) v = st[v].nxt[c], l++;
-			if (l > best) best = l, bestpos = i;
+			for (; v && !st[v].next[c]; v = st[v].link) l = st[v].len;
+			if (st[v].next[c]) v = st[v].next[c], l++;
+			if (l > best) best = l, bestp = i;
 		}
-		return {bestpos - best + 1, best};
+		return {bestp - best + 1, best};
 	}
 };
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