#35305 (C++11（廃止可能性あり）) No.238 Mr. K's Another Gift

• 問題: No.238 Mr. K's Another Gift
• ユーザー: torus711
• 提出日時: 2015-07-05 23:37:58
• 言語: C++11（廃止可能性あり） (gcc 13.3.0)
• 結果: WA
• 実行時間: -
• コード長: 3,167 bytes
• コンパイル時間: 815 ms
• コンパイル使用メモリ: 99,016 KB
• 実行使用メモリ: 6,216 KB
• 最終ジャッジ日時: 2024-07-08 00:56:17
• 合計ジャッジ時間: 3,155 ms
• ジャッジサーバーID （参考情報）: judge5 / judge3

ファイルパターン	結果
sample	AC * 2 WA * 1
other	AC * 34 WA * 6

ソースコード

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#include <iostream>
#include <iomanip>
#include <sstream>
#include <vector>
#include <string>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <stack>
#include <queue>
#include <deque>
#include <algorithm>
#include <functional>
#include <iterator>
#include <limits>
#include <numeric>
#include <utility>
#include <cmath>
#include <cassert>
#include <cstdio>
using namespace std; using namespace placeholders;
using LL = long long;
using ULL = unsigned long long;
using VI = vector< int >;
using VVI = vector< vector< int > >;
using VS = vector< string >;
using SS = stringstream;
using PII = pair< int, int >;
using VPII = vector< pair< int, int > >;
template < typename T = int > using VT = vector< T >;
template < typename T = int > using VVT = vector< vector< T > >;
template < typename T = int > using LIM = numeric_limits< T >;
template < typename T > inline istream& operator>>( istream &s, vector< T > &v ){ for ( T &t : v ) { s >> t; } return s; }
template < typename T > inline ostream& operator<<( ostream &s, const vector< T > &v ){ for ( int i = 0; i < int( v.size() ); ++i ){ s << ( " " + !i 
    ) << v[i]; } return s; }
template < typename T > inline T fromString( const string &s ) { T res; istringstream iss( s ); iss >> res; return res; };
template < typename T > inline string toString( const T &a ) { ostringstream oss; oss << a; return oss.str(); };
#define REP2( i, n ) REP3( i, 0, n )
#define REP3( i, m, n ) for ( int i = ( int )( m ); i < ( int )( n ); ++i )
#define GET_REP( a, b, c, F, ... ) F
#define REP( ... ) GET_REP( __VA_ARGS__, REP3, REP2 )( __VA_ARGS__ )
#define FOR( e, c ) for ( auto &e : c )
#define ALL( c ) ( c ).begin(), ( c ).end()
#define AALL( a, t ) ( t* )a, ( t* )a + sizeof( a ) / sizeof( t )
#define DRANGE( c, p ) ( c ).begin(), ( c ).begin() + ( p ), ( c ).end()
#define SZ( v ) ( (int)( v ).size() )
#define PB push_back
#define EM emplace
#define EB emplace_back
#define BI back_inserter
#define EXIST( c, e ) ( ( c ).find( e ) != ( c ).end() )
#define MP make_pair
#define fst first
#define snd second
#define DUMP( x ) cerr << #x << " = " << ( x ) << endl
string solve( const string &a, const string &b )
{
    const int N = SZ( a ), M = SZ( b );
    VVI dp( M + 1, VI( 2 ) );
    dp[0][0] = 1;
    // dp[ b の次の位置 ][ b に挿入したか ]
    REP( i, M )
    {
        dp[i][1] |= dp[i][0];
        REP( j, 2 )
        {
            if ( a[ i + j ] == b[i] )
            {
                dp[ i + 1 ][j] |= dp[i][j];
            }
        }
    }
    return dp[M][1] ? a : "";
}
int main()
{
    cin.tie( 0 );
    ios::sync_with_stdio( false );
    string S;
    cin >> S;
    const int L = SZ( S );
    if ( L % 2 == 0 && equal( ALL( S ), S.rbegin() ) )
    {
        S.insert( L / 2, "a" );
        cout << S << endl;
        return 0;
    }
    
    REP( i, 2 )
    {
        string a = S.substr( 0, ( L - 1 ) / 2 + i );
        string b = S.substr( ( L - 1 ) / 2 + ( L - 1 ) % 2 + i );
        reverse( ALL( a ) );
        string res = SZ( a ) < SZ( b ) ? solve( b, a ) : solve( a, b );
        if ( res != "" )
        {
            string rev( res );
            reverse( ALL( rev ) );
            if ( L % 2 == 0 )
            {
                rev += S[ L / 2 ];
            }
            rev += res;
            cout << rev << endl;
            return 0;
        }
    }
    cout << "NA" << endl;
    return 0;
}
 
 
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