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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#74061#4812. Counting SequenceKHINWA 17ms35396kbC++141.8kb2023-01-30 15:19:302023-01-30 15:19:32

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2023-01-30 15:19:32]
  • 评测
  • 测评结果:WA
  • 用时:17ms
  • 内存:35396kb
  • [2023-01-30 15:19:30]
  • 提交

answer

# include <cstdlib>
# include <numeric>
# include <cstdio>

namespace khin {
  using namespace std;
  namespace main {
    inline namespace source {}
    namespace c { void main(); }
  }
}

int main() { khin::main::c::main(); }

namespace khin::main::c {
  constexpr uint mod(998'244'353);
  constexpr uint& add_eq(uint& x, uint const y)
  { return x = x + y < mod ? x + y : x + y - mod; }
  constexpr uint qpow(uint a, uint n) {
    uint r(1);
    while (n) {
      if (n & 0b1) r = 1ul * r * a % mod;
      a = 1ul * a * a % mod, n >>= 1;
    }
    return r;
  }
  constexpr uint inv(uint const x) { return qpow(x, mod - 2); }
  constexpr uint frac(uint const x, uint const y)
  { return 1ul * x * inv(y) % mod; }
  constexpr uint n_max(300'000), b(774);
  uint n; uint c; uint f[4 * b][2 * b], g[b][n_max];
  uint calc0() {
    uint const s(4 * b);
    for (uint i(1); i < b; ++i) f[i % s][i] = 1;
    for (uint i(1); i < n; ++i) for (uint j(1); j < 2 * b; ++j) {
      uint const val(f[i % s][j]); if (!val) continue;
      if (j - 1) add_eq(f[(i + j - 1) % s][j - 1], 1ul * val * 1 % mod);
      if (j + 1) add_eq(f[(i + j + 1) % s][j + 1], 1ul * val * c % mod);
    }
    return accumulate(f[n % s], f[n % s] + 2 * b, 0ul) % mod;
  }
  uint calc1() {
    g[0][0] = 1;
    for (uint i(1); i < b; ++i) for (uint j(0); j < n; ++j) {
      add_eq(g[i][j + i], 1ul * g[i - 1][j] * 1 % mod);
      add_eq(g[i][j + 0], 1ul * g[i - 1][j] * c % mod);
    }
    uint res(0);
    for (uint i(b); i <= n; ++i) for (uint j(0); i * (j + 1) <= n; ++j) {
      uint const x(n - i * (j + 1));
      if (x % 2 == j * (j + 1) / 2 % 2)
        add_eq(res, g[j][(x + j * (j + 1) / 2) / 2]);
    }
    return res;
  }
  void main() {
    scanf("%u%u", &n, &c);
    printf("%u\n", (calc0() + calc1()) % mod);
  }
}

详细

Test #1:

score: 100
Accepted
time: 0ms
memory: 11900kb

input:

5 3

output:

8

result:

ok 1 number(s): "8"

Test #2:

score: 0
Accepted
time: 0ms
memory: 11976kb

input:

1 0

output:

1

result:

ok 1 number(s): "1"

Test #3:

score: 0
Accepted
time: 17ms
memory: 27544kb

input:

2022 39

output:

273239559

result:

ok 1 number(s): "273239559"

Test #4:

score: 0
Accepted
time: 0ms
memory: 13928kb

input:

1 998244352

output:

1

result:

ok 1 number(s): "1"

Test #5:

score: 0
Accepted
time: 4ms
memory: 11984kb

input:

1 12345678

output:

1

result:

ok 1 number(s): "1"

Test #6:

score: 0
Accepted
time: 4ms
memory: 12004kb

input:

20 998998

output:

643731701

result:

ok 1 number(s): "643731701"

Test #7:

score: 0
Accepted
time: 0ms
memory: 12008kb

input:

23 123

output:

947753998

result:

ok 1 number(s): "947753998"

Test #8:

score: 0
Accepted
time: 1ms
memory: 12128kb

input:

50 5555

output:

745339864

result:

ok 1 number(s): "745339864"

Test #9:

score: 0
Accepted
time: 1ms
memory: 12060kb

input:

60 6666

output:

690992218

result:

ok 1 number(s): "690992218"

Test #10:

score: 0
Accepted
time: 0ms
memory: 12272kb

input:

100 50

output:

169678588

result:

ok 1 number(s): "169678588"

Test #11:

score: 0
Accepted
time: 6ms
memory: 13588kb

input:

500 88888

output:

216149701

result:

ok 1 number(s): "216149701"

Test #12:

score: 0
Accepted
time: 0ms
memory: 18456kb

input:

1000 213456

output:

270989457

result:

ok 1 number(s): "270989457"

Test #13:

score: 0
Accepted
time: 12ms
memory: 28564kb

input:

2000 119988

output:

756425375

result:

ok 1 number(s): "756425375"

Test #14:

score: -100
Wrong Answer
time: 16ms
memory: 35396kb

input:

3000 998244352

output:

71841226

result:

wrong answer 1st numbers differ - expected: '71841227', found: '71841226'