This documentation is automatically generated by online-judge-tools/verification-helper
// competitive-verifier: PROBLEM https://yukicoder.me/problems/no/273
#include "../../template/template.hpp"
#include "../../string/palindromic-tree.hpp"
int main() {
string S;
cin >> S;
int N = (int) S.size();
vector< int > dp1(N + 3, -inf), dp2(N + 1, -inf);
PalindromicTree t;
dp2[0] = 1;
for(int i = 0; i < N; i++) {
int id = t.add(S[i]);
auto ret = t.update_dp([&](int id, int pos) {
if(i + 1 - pos == N) dp1[id] = dp2[pos];
else dp1[id] = max(dp2[pos], i + 1 - pos);
},
[&](int id, int par) {
if(t[id].len == N) chmax(dp1[id], dp1[par]);
else chmax(dp1[id], max(dp1[par], t[id].len));
});
for(auto &p: ret) chmax(dp2[i + 1], dp1[p]);
}
cout << dp2[N] << "\n";
}
#line 1 "test/verify/yukicoder-273.test.cpp"
// competitive-verifier: PROBLEM https://yukicoder.me/problems/no/273
#line 1 "template/template.hpp"
#include <bits/stdc++.h>
using namespace std;
using int64 = long long;
const int64 infll = (1LL << 62) - 1;
const int inf = (1 << 30) - 1;
struct IoSetup {
IoSetup() {
cin.tie(nullptr);
ios::sync_with_stdio(false);
cout << fixed << setprecision(10);
cerr << fixed << setprecision(10);
}
} iosetup;
template <typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> &p) {
os << p.first << " " << p.second;
return os;
}
template <typename T1, typename T2>
istream &operator>>(istream &is, pair<T1, T2> &p) {
is >> p.first >> p.second;
return is;
}
template <typename T>
ostream &operator<<(ostream &os, const vector<T> &v) {
for (int i = 0; i < (int)v.size(); i++) {
os << v[i] << (i + 1 != v.size() ? " " : "");
}
return os;
}
template <typename T>
istream &operator>>(istream &is, vector<T> &v) {
for (T &in : v) is >> in;
return is;
}
template <typename T1, typename T2>
inline bool chmax(T1 &a, T2 b) {
return a < b && (a = b, true);
}
template <typename T1, typename T2>
inline bool chmin(T1 &a, T2 b) {
return a > b && (a = b, true);
}
template <typename T = int64>
vector<T> make_v(size_t a) {
return vector<T>(a);
}
template <typename T, typename... Ts>
auto make_v(size_t a, Ts... ts) {
return vector<decltype(make_v<T>(ts...))>(a, make_v<T>(ts...));
}
template <typename T, typename V>
typename enable_if<is_class<T>::value == 0>::type fill_v(T &t, const V &v) {
t = v;
}
template <typename T, typename V>
typename enable_if<is_class<T>::value != 0>::type fill_v(T &t, const V &v) {
for (auto &e : t) fill_v(e, v);
}
template <typename F>
struct FixPoint : F {
explicit FixPoint(F &&f) : F(forward<F>(f)) {}
template <typename... Args>
decltype(auto) operator()(Args &&...args) const {
return F::operator()(*this, forward<Args>(args)...);
}
};
template <typename F>
inline decltype(auto) MFP(F &&f) {
return FixPoint<F>{forward<F>(f)};
}
#line 4 "test/verify/yukicoder-273.test.cpp"
#line 1 "string/palindromic-tree.hpp"
/**
* @brief Palindromic Tree(回文木)
* @see https://math314.hateblo.jp/entry/2016/12/19/005919
*
*/
template <typename T = char>
struct PalindromicTree {
public:
struct Node {
map<T, int> link; // 子のidx
int suffix_link; // 最長回文接尾辞のidx
int len; // 対応する回文の長さ
vector<int> idx; // 対応する回文を最長回文接尾辞とするidx
int delta_link; // 差分が異なる最長回文接尾辞のidx
Node() = default;
Node(int suf, int len) : suffix_link(suf), len(len), delta_link(-1) {}
};
vector<Node> ns;
int ptr;
vector<T> vs;
private:
int find_prev_palindrome(int cur) const {
int pos = (int)vs.size() - 1;
for (;;) {
int rev = pos - 1 - ns[cur].len;
if (rev >= 0 and vs[rev] == vs.back()) break;
cur = ns[cur].suffix_link;
}
return cur;
}
bool output_dfs(int v, int id, vector<T> &ret) const {
if (v == id) return true;
for (auto &nxt : ns[v].link) {
if (output_dfs(nxt.second, id, ret)) {
ret.emplace_back(nxt.first);
return true;
}
}
return false;
}
public:
PalindromicTree() : ptr(0) {
ns.emplace_back(0, -1); // 長さ -1
ns.emplace_back(0, 0); // 長さ 0
}
PalindromicTree(const string &S) : PalindromicTree() { add(S); }
int diff(int t) const {
if (ns[t].suffix_link <= 0) return -1;
return ns[t].len - ns[ns[t].suffix_link].len;
}
int add(const T &x) {
int idx = (int)vs.size();
vs.emplace_back(x);
int cur = find_prev_palindrome(ptr);
auto res = ns[cur].link.insert(make_pair(x, (int)ns.size()));
ptr = res.first->second;
if (res.second) {
ns.emplace_back(-1, ns[cur].len + 2);
if (ns.back().len == 1) {
ns.back().suffix_link = 1;
} else {
ns.back().suffix_link =
ns[find_prev_palindrome(ns[cur].suffix_link)].link[x];
}
if (diff(ptr) == diff(ns.back().suffix_link)) {
ns.back().delta_link = ns[ns.back().suffix_link].delta_link;
} else {
ns.back().delta_link = ns.back().suffix_link;
}
}
ns[ptr].idx.emplace_back(idx);
return ptr;
}
// add(x) のあとに呼び出す
// * init(node_idx, pos): 頂点 node_idx を S[pos,i]
// が回文のときの初期値にする
// * apply(node_idx, pre_idx): 頂点 node_idx に 頂点 pre_idx の結果を加える
// * update: S[i]を末尾とする回文の頂点番号の集合
template <typename I, typename U>
vector<int> update_dp(const I &init, const U &apply) {
int i = (int)vs.size() - 1;
int id = ptr;
vector<int> update;
while (ns[id].len > 0) {
init(id, i + 1 - ns[ns[id].delta_link].len - diff(id));
if (ns[id].suffix_link != ns[id].delta_link) {
apply(id, ns[id].suffix_link);
}
update.emplace_back(id);
id = ns[id].delta_link;
}
return update;
}
void add(const string &s) {
for (auto &x : s) add(x);
}
vector<int> build_frequency() const {
vector<int> ret(ns.size());
for (int i = (int)ns.size() - 1; i > 0; i--) {
ret[i] += (int)ns[i].idx.size();
ret[ns[i].suffix_link] += ret[i];
}
return ret;
}
vector<T> output(int idx) const {
if (idx == 0) return {-1};
if (idx == 1) return {0};
vector<T> ret;
output_dfs(0, idx, ret);
output_dfs(1, idx, ret);
int start = (int)ret.size() - 1;
if (ns[idx].len & 1) --start;
for (int i = start; i >= 0; i--) {
ret.emplace_back(ret[i]);
}
return ret;
}
int size() const { return (int)ns.size(); }
Node &operator[](int idx) { return ns[idx]; }
};
#line 6 "test/verify/yukicoder-273.test.cpp"
int main() {
string S;
cin >> S;
int N = (int) S.size();
vector< int > dp1(N + 3, -inf), dp2(N + 1, -inf);
PalindromicTree t;
dp2[0] = 1;
for(int i = 0; i < N; i++) {
int id = t.add(S[i]);
auto ret = t.update_dp([&](int id, int pos) {
if(i + 1 - pos == N) dp1[id] = dp2[pos];
else dp1[id] = max(dp2[pos], i + 1 - pos);
},
[&](int id, int par) {
if(t[id].len == N) chmax(dp1[id], dp1[par]);
else chmax(dp1[id], max(dp1[par], t[id].len));
});
for(auto &p: ret) chmax(dp2[i + 1], dp1[p]);
}
cout << dp2[N] << "\n";
}
Env | Name | Status | Elapsed | Memory |
---|---|---|---|---|
g++ | 99_system_test1.txt | AC | 6 ms | 4 MB |
g++ | 99_system_test2.txt | AC | 6 ms | 4 MB |
g++ | 99_system_test3.txt | AC | 6 ms | 4 MB |
g++ | sample1.txt | AC | 6 ms | 4 MB |
g++ | sample2.txt | AC | 6 ms | 4 MB |
g++ | sample3.txt | AC | 6 ms | 4 MB |
g++ | system_test1.txt | AC | 6 ms | 4 MB |
g++ | system_test2.txt | AC | 6 ms | 4 MB |
g++ | system_test3.txt | AC | 6 ms | 4 MB |
g++ | system_test4.txt | AC | 6 ms | 4 MB |
g++ | system_test5.txt | AC | 6 ms | 4 MB |
g++ | system_test6.txt | AC | 6 ms | 4 MB |
g++ | system_test7.txt | AC | 6 ms | 4 MB |
g++ | system_test8.txt | AC | 6 ms | 4 MB |
g++ | system_test9.txt | AC | 6 ms | 4 MB |
g++ | test1.txt | AC | 6 ms | 4 MB |
g++ | test10.txt | AC | 6 ms | 4 MB |
g++ | test11.txt | AC | 6 ms | 4 MB |
g++ | test12.txt | AC | 6 ms | 4 MB |
g++ | test13.txt | AC | 6 ms | 4 MB |
g++ | test14.txt | AC | 6 ms | 4 MB |
g++ | test15.txt | AC | 6 ms | 4 MB |
g++ | test16.txt | AC | 6 ms | 4 MB |
g++ | test17.txt | AC | 6 ms | 4 MB |
g++ | test18.txt | AC | 6 ms | 4 MB |
g++ | test19.txt | AC | 6 ms | 4 MB |
g++ | test2.txt | AC | 6 ms | 4 MB |
g++ | test20.txt | AC | 6 ms | 4 MB |
g++ | test3.txt | AC | 6 ms | 4 MB |
g++ | test4.txt | AC | 6 ms | 4 MB |
g++ | test5.txt | AC | 6 ms | 4 MB |
g++ | test6.txt | AC | 6 ms | 4 MB |
g++ | test7.txt | AC | 6 ms | 4 MB |
g++ | test8.txt | AC | 6 ms | 4 MB |
g++ | test9.txt | AC | 6 ms | 4 MB |
clang++ | 99_system_test1.txt | AC | 6 ms | 4 MB |
clang++ | 99_system_test2.txt | AC | 6 ms | 4 MB |
clang++ | 99_system_test3.txt | AC | 6 ms | 4 MB |
clang++ | sample1.txt | AC | 6 ms | 4 MB |
clang++ | sample2.txt | AC | 6 ms | 4 MB |
clang++ | sample3.txt | AC | 6 ms | 4 MB |
clang++ | system_test1.txt | AC | 6 ms | 4 MB |
clang++ | system_test2.txt | AC | 6 ms | 4 MB |
clang++ | system_test3.txt | AC | 6 ms | 4 MB |
clang++ | system_test4.txt | AC | 6 ms | 4 MB |
clang++ | system_test5.txt | AC | 6 ms | 4 MB |
clang++ | system_test6.txt | AC | 6 ms | 4 MB |
clang++ | system_test7.txt | AC | 6 ms | 4 MB |
clang++ | system_test8.txt | AC | 6 ms | 4 MB |
clang++ | system_test9.txt | AC | 6 ms | 4 MB |
clang++ | test1.txt | AC | 6 ms | 4 MB |
clang++ | test10.txt | AC | 6 ms | 4 MB |
clang++ | test11.txt | AC | 6 ms | 4 MB |
clang++ | test12.txt | AC | 6 ms | 4 MB |
clang++ | test13.txt | AC | 6 ms | 4 MB |
clang++ | test14.txt | AC | 6 ms | 4 MB |
clang++ | test15.txt | AC | 6 ms | 4 MB |
clang++ | test16.txt | AC | 6 ms | 4 MB |
clang++ | test17.txt | AC | 6 ms | 4 MB |
clang++ | test18.txt | AC | 6 ms | 4 MB |
clang++ | test19.txt | AC | 6 ms | 4 MB |
clang++ | test2.txt | AC | 6 ms | 4 MB |
clang++ | test20.txt | AC | 6 ms | 4 MB |
clang++ | test3.txt | AC | 6 ms | 4 MB |
clang++ | test4.txt | AC | 6 ms | 4 MB |
clang++ | test5.txt | AC | 6 ms | 4 MB |
clang++ | test6.txt | AC | 6 ms | 4 MB |
clang++ | test7.txt | AC | 6 ms | 4 MB |
clang++ | test8.txt | AC | 6 ms | 4 MB |
clang++ | test9.txt | AC | 6 ms | 4 MB |