結果
問題 | No.588 空白と回文 |
ユーザー |
|
提出日時 | 2017-11-03 22:48:55 |
言語 | C++17(gcc12) (gcc 12.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 4 ms / 2,000 ms |
コード長 | 3,842 bytes |
コンパイル時間 | 12,739 ms |
コンパイル使用メモリ | 272,436 KB |
最終ジャッジ日時 | 2025-01-05 03:43:02 |
ジャッジサーバーID (参考情報) |
judge4 / judge2 |
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ファイルパターン | 結果 |
---|---|
other | AC * 25 |
ソースコード
#pragma GCC optimize ("O3")#pragma GCC target ("avx")#include "bits/stdc++.h" // define macro "/D__MAI"using namespace std;typedef long long int ll;#define xprintf(fmt,...) fprintf(stderr,fmt,__VA_ARGS__)#define debugv(v) {printf("L%d %s > ",__LINE__,#v);for(auto e:v){cout<<e<<" ";}cout<<endl;}#define debuga(m,w) {printf("L%d %s > ",__LINE__,#m);for(int x=0;x<(w);x++){cout<<(m)[x]<<" ";}cout<<endl;}#define debugaa(m,h,w) {printf("L%d %s >\n",__LINE__,#m);for(int y=0;y<(h);y++){for(int x=0;x<(w);x++){cout<<(m)[y][x]<<" ";}cout<<endl;}}#define ALL(v) (v).begin(),(v).end()#define repeat(cnt,l) for(auto cnt=0ll;(cnt)<(l);++(cnt))#define iterate(cnt,b,e) for(auto cnt=(b);(cnt)!=(e);++(cnt))#define MD 1000000007ll#define PI 3.1415926535897932384626433832795#define EPS 1e-12template<typename T1, typename T2> ostream& operator <<(ostream &o, const pair<T1, T2> p) { o << "(" << p.first << ":" << p.second << ")"; return o;}template<typename iterator> inline size_t argmin(iterator begin, iterator end) { return distance(begin, min_element(begin, end)); }template<typename iterator> inline size_t argmax(iterator begin, iterator end) { return distance(begin, max_element(begin, end)); }template<typename T> T& maxset(T& to, const T& val) { return to = max(to, val); }template<typename T> T& minset(T& to, const T& val) { return to = min(to, val); }void bye(string s, int code = 0) { cout << s << endl; exit(0); }mt19937_64 randdev(8901016);inline ll rand_range(ll l, ll h) {return uniform_int_distribution<ll>(l, h)(randdev);}#ifdef __MAI#define getchar_unlocked getchar#define putchar_unlocked putchar#endif#ifdef __VSCC#define getchar_unlocked _getchar_nolock#define putchar_unlocked _putchar_nolock#endifnamespace {#define isvisiblechar(c) (0x21<=(c)&&(c)<=0x7E)class MaiScanner {public:template<typename T> void input_integer(T& var) {var = 0;T sign = 1;int cc = getchar_unlocked();for (; cc<'0' || '9'<cc; cc = getchar_unlocked())if (cc == '-') sign = -1;for (; '0' <= cc&&cc <= '9'; cc = getchar_unlocked())var = (var << 3) + (var << 1) + cc - '0';var = var*sign;}inline int c() { return getchar_unlocked(); }inline MaiScanner& operator>>(int& var) {input_integer<int>(var);return *this;}inline MaiScanner& operator>>(long long& var) {input_integer<long long>(var);return *this;}inline MaiScanner& operator>>(string& var) {int cc = getchar_unlocked();for (; !isvisiblechar(cc); cc = getchar_unlocked());for (; isvisiblechar(cc); cc = getchar_unlocked())var.push_back(cc);return *this;}template<typename IT> void in(IT begin, IT end) {for (auto it = begin; it != end; ++it) *this >> *it;}};}MaiScanner scanner;// オンライン回文判定bool iskaibun(const string& str) {int left = 0;int right = str.size() - 1;while (left < right) {if (str[left] != str[right]) return false;++left; --right;}return true;}//ll m, n, kei;int main() {string str;scanner >> str;n = (int)str.size();int best = 1;repeat(center, n) {int cnt = 1;for (int i = 1; 0 <= center - i && center + i < n; ++i)cnt += (str[center - i] == str[center + i]) * 2;maxset(best, cnt);}repeat(center, n-1) {int cnt = 0;for (int i = 0; 0 <= center - i && center + i+1 < n; ++i)cnt += (str[center - i] == str[center + i+1]) * 2;maxset(best, cnt);}cout << best << endl;return 0;}