結果
| 問題 |
No.464 PPAP
|
| コンテスト | |
| ユーザー |
koyumeishi
|
| 提出日時 | 2016-12-15 22:27:06 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 53 ms / 2,000 ms |
| コード長 | 5,203 bytes |
| コンパイル時間 | 1,189 ms |
| コンパイル使用メモリ | 118,904 KB |
| 実行使用メモリ | 5,248 KB |
| 最終ジャッジ日時 | 2024-11-30 08:45:43 |
| 合計ジャッジ時間 | 2,206 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 22 |
ソースコード
#include <iostream>
#include <vector>
#include <cstdio>
#include <sstream>
#include <map>
#include <string>
#include <algorithm>
#include <queue>
#include <cmath>
#include <functional>
#include <set>
#include <ctime>
#include <random>
#include <chrono>
#include <cassert>
#include <tuple>
#include <utility>
using namespace std;
namespace {
using Integer = long long; //__int128;
template<class T, class S> istream& operator >> (istream& is, pair<T,S>& p){return is >> p.first >> p.second;}
template<class T> istream& operator >> (istream& is, vector<T>& vec){for(T& val: vec) is >> val; return is;}
template<class T> istream& operator , (istream& is, T& val){ return is >> val;}
template<class T, class S> ostream& operator << (ostream& os, const pair<T,S>& p){return os << p.first << " " << p.second;}
template<class T> ostream& operator << (ostream& os, const vector<T>& vec){for(size_t i=0; i<vec.size(); i++) os << vec[i] << (i==vec.size()-1?"":" "); return os;}
template<class T> ostream& operator , (ostream& os, const T& val){ return os << " " << val;}
template<class H> void print(const H& head){ cout << head; }
template<class H, class ... T> void print(const H& head, const T& ... tail){ cout << head << " "; print(tail...); }
template<class ... T> void println(const T& ... values){ print(values...); cout << endl; }
template<class H> void eprint(const H& head){ cerr << head; }
template<class H, class ... T> void eprint(const H& head, const T& ... tail){ cerr << head << " "; eprint(tail...); }
template<class ... T> void eprintln(const T& ... values){ eprint(values...); cerr << endl; }
class range{ Integer start_, end_, step_; public: struct range_iterator{ Integer val, step_; range_iterator(Integer v, Integer step) : val(v), step_(step) {} Integer operator * (){return val;} void operator ++ (){val += step_;} bool operator != (range_iterator& x){return step_ > 0 ? val < x.val : val > x.val;} }; range(Integer len) : start_(0), end_(len), step_(1) {} range(Integer start, Integer end) : start_(start), end_(end), step_(1) {} range(Integer start, Integer end, Integer step) : start_(start), end_(end), step_(step) {} range_iterator begin(){ return range_iterator(start_, step_); } range_iterator end(){ return range_iterator( end_, step_); } };
inline string operator "" _s (const char* str, size_t size){ return move(string(str)); }
constexpr Integer my_pow(Integer x, Integer k, Integer z=1){return k==0 ? z : k==1 ? z*x : (k&1) ? my_pow(x*x,k>>1,z*x) : my_pow(x*x,k>>1,z);}
constexpr Integer my_pow_mod(Integer x, Integer k, Integer M, Integer z=1){return k==0 ? z%M : k==1 ? z*x%M : (k&1) ? my_pow_mod(x*x%M,k>>1,M,z*x%M) : my_pow_mod(x*x%M,k>>1,M,z);}
constexpr unsigned long long operator "" _ten (unsigned long long value){ return my_pow(10,value); }
inline int k_bit(Integer x, int k){return (x>>k)&1;} //0-indexed
mt19937 mt(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count());
template<class T> string join(const vector<T>& v, const string& sep){ stringstream ss; for(size_t i=0; i<v.size(); i++){ if(i>0) ss << sep; ss << v[i]; } return ss.str(); }
inline string operator * (string s, int k){ string ret; while(k){ if(k&1) ret += s; s += s; k >>= 1; } return ret; }
}
constexpr long long mod = 9_ten + 7;
class palindromic_tree{
public:
struct node{
map<char, int> e;
int suf;
int len;
};
const string& s;
vector<node> t;
vector<int> s_pos;
void constract(){
int pos = 1;
for(int i=0; i<s.size(); s_pos[i++] = pos){
while(1){
if( i-t[pos].len-1 >= 0 && s[i-t[pos].len-1] == s[i]) break;
pos = t[pos].suf;
}
if(t[pos].e.count(s[i])){
pos = t[pos].e[s[i]];
continue;
}
int nx = t.size();
t.push_back(node{{}, -1, t[pos].len+2});
t[pos].e[s[i]] = nx;
if(t[nx].len == 1){
t[nx].suf = 1;
pos = nx;
continue;
}
while(1){
pos = t[pos].suf;
if( i-t[pos].len-1 >= 0 && s[i-t[pos].len-1] == s[i]){
t[nx].suf = t[pos].e[s[i]];
break;
}
}
pos = nx;
}
}
void init(){
t[0].suf = 0;
t[0].len = -1;
t[1].suf = 0;
t[1].len = 0;
}
palindromic_tree(const string& s_) : s(s_), t(2), s_pos(s_.size()){
init();
constract();
}
};
long long dfs(palindromic_tree& p, int i){
int pos = p.s_pos[i];
long long ret = 0;
while(pos > 1){
int len = p.t[ pos ].len;
int suf = p.t[ pos ].suf;
int left = i-len;
if(left >= 0){
if(left - p.t[ p.s_pos[left] ].len == -1) ret++;
}
pos = suf;
}
return ret;
}
int main(){
string s;
cin >> s;
palindromic_tree p(s);
vector<long long> dp(s.size()+1, 0);
for(int i=1; i<s.size(); i++){
dp[i] = dfs(p, i);
}
for(int i=1; i<s.size(); i++){
dp[i] += dp[i-1];
}
long long ans = 0;
int pos = p.s_pos[ s.size()-1 ];
int i = s.size()-1;
while(pos > 1){
int len = p.t[pos].len;
int suf = p.t[pos].suf;
int left = i-len-1;
if( left >= 0 ){
ans += dp[left];
}
pos = suf;
}
println(ans);
return 0;
}
koyumeishi