結果
| 問題 |
No.1494 LCS on Tree
|
| コンテスト | |
| ユーザー |
suta28407928
|
| 提出日時 | 2021-04-30 23:37:27 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 4,634 bytes |
| コンパイル時間 | 2,382 ms |
| コンパイル使用メモリ | 192,540 KB |
| 実行使用メモリ | 126,208 KB |
| 最終ジャッジ日時 | 2024-07-19 03:48:07 |
| 合計ジャッジ時間 | 11,017 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge2 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 6 WA * 41 |
ソースコード
#pragma GCC target("avx2")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
//#include <atcoder/all>
using namespace std;
//using namespace atcoder;
#define DEBUG
#ifdef DEBUG
template <class T, class U>
ostream &operator<<(ostream &os, const pair<T, U> &p) {
os << '(' << p.first << ',' << p.second << ')';
return os;
}
template <class T> ostream &operator<<(ostream &os, const vector<T> &v) {
os << '{';
for(int i = 0; i < (int)v.size(); i++) {
if(i) { os << ','; }
os << v[i];
}
os << '}';
return os;
}
void debugg() { cerr << endl; }
template <class T, class... Args>
void debugg(const T &x, const Args &... args) {
cerr << " " << x;
debugg(args...);
}
#define debug(...) \
cerr << __LINE__ << " [" << #__VA_ARGS__ << "]: ", debugg(__VA_ARGS__)
#define dump(x) cerr << __LINE__ << " " << #x << " = " << (x) << endl
#else
#define debug(...) (void(0))
#define dump(x) (void(0))
#endif
using namespace std;
typedef long long ll;
typedef vector<ll> vl;
typedef vector<vector<ll>> vvl;
typedef vector<char> vc;
typedef vector<string> vs;
typedef vector<bool> vb;
typedef vector<double> vd;
typedef pair<ll,ll> P;
typedef pair<int,int> pii;
typedef vector<P> vpl;
typedef tuple<ll,ll,ll> tapu;
#define rep(i,n) for(int i=0; i<(n); i++)
#define REP(i,a,b) for(int i=(a); i<(b); i++)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
const int inf = (1<<30) - 1;
const ll linf = 1LL<<61;
const int MAX = 510000;
int dy[8] = {0,1,0,-1,1,-1,-1,1};
int dx[8] = {-1,0,1,0,1,-1,1,-1};
const double pi = 3.14159265358979;
const double eps = 1e-8;
template<typename T1,typename T2> inline bool chmin(T1 &a,T2 b){
if(a>b){
a = b; return true;
}
else return false;
}
template<typename T1,typename T2> inline bool chmax(T1 &a,T2 b){
if(a<=b){
a = b; return true;
}
else return false;
}
template<typename T> inline void print(T &a){
int sz = a.size();
for(auto itr = a.begin(); itr != a.end(); itr++){
cout << *itr;
sz--;
if(sz) cout << " ";
}
cout << "\n";
}
template<typename T1,typename T2> inline void print2(T1 a, T2 b){
cout << a << " " << b << "\n";
}
template<typename T1,typename T2,typename T3> inline void print3(T1 a, T2 b, T3 c){
cout << a << " " << b << " " << c << "\n";
}
void mark() {cout << "#" << "\n";}
ll pcount(ll x) {return __builtin_popcountll(x);}
const int mod = 1e9 + 7;
//const int mod = 998244353;
int dp[2020][2020];
int ep[2020][2020];
int main(){
int n; cin >> n;
string s; cin >> s;
vector<vector<pair<int,char>>> G(n);
rep(i,n-1){
int u,v;
char c;
cin >> u >> v >> c; u--; v--;
G[u].emplace_back(v,c);
G[v].emplace_back(u,c);
}
int m = s.size();
int ans = 0;
auto dfs = [&](auto &&dfs, int u, int p) -> void {
vector<pair<int,int>> d1(m+1,{0,-1}), d2(m+1,{0,-1}),e1(m+1,{0,-1}),e2(m+1,{0,-1});
for(auto v : G[u]){
if(v.first == p) continue;
dfs(dfs,v.first,u);
rep(i,m){
int C = s[i] == v.second;
if(dp[v.first][i] + C >= d1[i].first){
d2[i] = d1[i];
d1[i] = {dp[v.first][i] + C, v.first};
}else if(dp[v.first][i] + C >= d2[i].first){
d2[i] = {dp[v.first][i] + C, v.first};
}
chmax(dp[u][i+1], dp[v.first][i] + C);
chmax(ep[u][i], ep[v.first][i+1] + C);
}
for(int i=1; i<=m; i++){
int C = s[i-1] == v.second;
if(ep[v.first][i] + C >= e2[i].first){
e2[i] = e1[i];
e1[i] = {ep[v.first][i] + C, v.first};
}else if(ep[v.first][i] + C >= e2[i].first){
e2[i] = {ep[v.first][i] + C, v.first};
}
}
}
for(auto v : G[u]){
if(v.first == p) continue;
rep(i,m){
if(e1[i+1].second == v.first) chmax(ans, dp[v.first][i] + e2[i+1].first);
else chmax(ans, dp[v.first][i] + e1[i+1].first);
if(d1[i].second == v.first) chmax(ans, d2[i].first + ep[v.first][i+1]);
else chmax(ans, d1[i].first + ep[v.first][i+1]);
}
}
chmax(ans, dp[u][m]);
chmax(ans, ep[u][0]);
rep(i,m) chmax(dp[u][i+1], dp[u][i]);
for(int i=m-1; i>=0; i--) chmax(ep[u][i], ep[u][i+1]);
};
dfs(dfs,0,-1);
cout << ans << endl;
}
suta28407928