結果

問題 No.1171 Runs in Subsequences
コンテスト
ユーザー rabimea
提出日時 2025-09-29 14:02:48
言語 C++23
(gcc 15.2.0 + boost 1.90.0)
コンパイル:
g++-15 -O2 -lm -std=c++23 -Wuninitialized -DONLINE_JUDGE -o a.out _filename_
実行:
./a.out
結果
AC  
実行時間 305 ms / 2,000 ms
+ 4µs
コード長 1,155 bytes
記録
記録タグの例:
初AC ショートコード 純ショートコード 純主流ショートコード 最速実行時間
コンパイル時間 2,114 ms
コンパイル使用メモリ 336,332 KB
実行使用メモリ 5,888 KB
最終ジャッジ日時 2026-07-15 07:46:36
合計ジャッジ時間 5,903 ms
ジャッジサーバーID
(参考情報)
judge1_1 / judge3_0
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 4
other AC * 18
権限があれば一括ダウンロードができます
コンパイルメッセージ
In file included from /home/linuxbrew/.linuxbrew/Cellar/gcc@15/15.3.0/include/c++/15/vector:67,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@15/15.3.0/include/c++/15/functional:66,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@15/15.3.0/include/c++/15/x86_64-pc-linux-gnu/bits/stdc++.h:55,
                 from main.cpp:4:
In function '_ForwardIterator std::uninitialized_copy(_InputIterator, _InputIterator, _ForwardIterator) [with _InputIterator = long long int*; _ForwardIterator = long long int*]',
    inlined from 'constexpr _ForwardIterator std::__uninitialized_copy_a(_InputIterator, _Sentinel, _ForwardIterator, allocator<_Tp>&) [with _InputIterator = long long int*; _Sentinel = long long int*; _ForwardIterator = long long int*; _Tp = long long int]' at /home/linuxbrew/.linuxbrew/Cellar/gcc@15/15.3.0/include/c++/15/bits/stl_uninitialized.h:635:32,
    inlined from 'constexpr std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(const std::vector<_Tp, _Alloc>&) [with _Tp = long long int; _Alloc = std::allocator<long long int>]' at /home/linuxbrew/.linuxbrew/Cellar/gcc@15/15.3.0/include/c++/15/bits/vector.tcc:257:35,
    inlined from 'int main()' at main.cpp:47:13:
/home/linuxbrew/.linuxbrew/Cellar/gcc@15/15.3.0/include/c++/15/bits/stl_uninitialized.h:273:31: warning: 'void* __builtin_memcpy(void*, const void*, long unsigned int)' writing between 1 and 1024 bytes into a region of size 0 overflows the destination [-Wstringop-overflow=]
  273 |               __builtin_memcpy(std::__niter_base(__result),
      |               ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  274 |                                std::__niter_base(__first),
      |                                ~~~~~~~~~~~~~~~~~~~~~~~~~~~
  275 |                                __n * sizeof(_ValT));
      |                                ~~~~~~~~~~~~~~~~~~~~
In file included from /home/linuxbrew/.linuxbrew/Cellar/gcc@15/15.3.0/include/c++/15/x86_64-pc-linux-gnu/bits/c++

ソースコード

diff #
raw source code

// #pragma GCC optimize ("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target ("avx,avx2,fma")
#include <bits/stdc++.h>

using std::cin, std::cout, std::cerr;
using ll = long long;

const ll P = 1e9 + 7;
ll Pow(ll a, ll b) {
    ll r = 1;
    for(; b; b /= 2) {
        if(b & 1)
            r = r * a % P;
        a = a * a % P;
    }
    return r;
}

int main() {
    std::ios::sync_with_stdio(false);
    std::string s; cin >> s;

    auto upd = [](ll &a, ll b) {
        a += b;
        a %= P;
    };
    std::vector<ll> f(128);
    ll ans = 0;
    int n = s.size();
    for(int i = 0; i < n; i ++) {
        char c = s[i];
        std::vector<ll> g(128, 0);
        upd(g[c], 1);
        upd(ans, Pow(2, n - i - 1));
        for(char t = 'a'; t <= 'z'; t ++) {
            if(t != c) {
                upd(g[t], f[t]);
                upd(ans, f[t] * Pow(2, n - i - 1));
                upd(g[c], f[t]);
            } else {
                upd(g[t], 2 * f[t]);
            }
        }
        // cout << "------\n";
        // cout << g['a'] << ' ' << g['b'] << ' ' << ans << '\n';
        f = g;
    }
    cout << ans << '\n';
}
0