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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
#74067#4812. Counting SequenceKHINWA 104ms22644kbC++142.0kb2023-01-30 15:31:462023-01-30 15:31:47

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 15:31:47]
  • 评测
  • 测评结果:WA
  • 用时:104ms
  • 内存:22644kb
  • [2023-01-30 15:31:46]
  • 提交

answer

# include <cstdlib>
# include <cstring>
# 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[2][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);
      }
      memset(f[i % s], 0x00, sizeof f[i % s]);
    }
    return accumulate(f[n % s], f[n % s] + 2 * b, 0ul) % mod;
  }
  uint calc1() {
    uint res(n >= b);
    g[0][0] = 1;
    for (uint i(1); i < b; ++i) {
      memset(g[i % 2], 0x00, sizeof g[i % 2]);
      for (uint j(0); j < n; ++j) if (g[(i - 1) % 2][j]) {
        add_eq(g[i % 2][j + i], 1ul * g[(i - 1) % 2][j] * 1 % mod);
        add_eq(g[i % 2][j + 0], 1ul * g[(i - 1) % 2][j] * c % mod);
      }
      for (uint j(b); j <= n; ++j) {
        uint const x(n - j * (i + 1));
        if (x % 2 != i * (i + 1) / 2 % 2) continue;
        uint const y((x + i * (i + 1) / 2) / 2);
        if (y < n) add_eq(res, g[i % 2][y]);
      }
    }
    return res;
  }
  void main() {
    scanf("%u%u", &n, &c);
    printf("%u\n", (calc0() + calc1()) % mod);
  }
}

詳細信息

Test #1:

score: 100
Accepted
time: 33ms
memory: 9140kb

input:

5 3

output:

8

result:

ok 1 number(s): "8"

Test #2:

score: 0
Accepted
time: 38ms
memory: 9056kb

input:

1 0

output:

1

result:

ok 1 number(s): "1"

Test #3:

score: 0
Accepted
time: 53ms
memory: 19212kb

input:

2022 39

output:

273239559

result:

ok 1 number(s): "273239559"

Test #4:

score: 0
Accepted
time: 34ms
memory: 10304kb

input:

1 998244352

output:

1

result:

ok 1 number(s): "1"

Test #5:

score: 0
Accepted
time: 37ms
memory: 8612kb

input:

1 12345678

output:

1

result:

ok 1 number(s): "1"

Test #6:

score: 0
Accepted
time: 34ms
memory: 9580kb

input:

20 998998

output:

643731701

result:

ok 1 number(s): "643731701"

Test #7:

score: 0
Accepted
time: 34ms
memory: 9644kb

input:

23 123

output:

947753998

result:

ok 1 number(s): "947753998"

Test #8:

score: 0
Accepted
time: 33ms
memory: 8900kb

input:

50 5555

output:

745339864

result:

ok 1 number(s): "745339864"

Test #9:

score: 0
Accepted
time: 33ms
memory: 8600kb

input:

60 6666

output:

690992218

result:

ok 1 number(s): "690992218"

Test #10:

score: 0
Accepted
time: 39ms
memory: 10100kb

input:

100 50

output:

169678588

result:

ok 1 number(s): "169678588"

Test #11:

score: 0
Accepted
time: 36ms
memory: 9540kb

input:

500 88888

output:

216149701

result:

ok 1 number(s): "216149701"

Test #12:

score: 0
Accepted
time: 38ms
memory: 12484kb

input:

1000 213456

output:

270989457

result:

ok 1 number(s): "270989457"

Test #13:

score: 0
Accepted
time: 49ms
memory: 19048kb

input:

2000 119988

output:

756425375

result:

ok 1 number(s): "756425375"

Test #14:

score: 0
Accepted
time: 48ms
memory: 22644kb

input:

3000 998244352

output:

71841227

result:

ok 1 number(s): "71841227"

Test #15:

score: 0
Accepted
time: 53ms
memory: 22548kb

input:

3000 555555555

output:

79880116

result:

ok 1 number(s): "79880116"

Test #16:

score: 0
Accepted
time: 62ms
memory: 22644kb

input:

4321 1234

output:

949603993

result:

ok 1 number(s): "949603993"

Test #17:

score: 0
Accepted
time: 60ms
memory: 22620kb

input:

5000 0

output:

5

result:

ok 1 number(s): "5"

Test #18:

score: 0
Accepted
time: 64ms
memory: 22616kb

input:

5000 88888777

output:

833064960

result:

ok 1 number(s): "833064960"

Test #19:

score: 0
Accepted
time: 69ms
memory: 22548kb

input:

5000 35557777

output:

696388498

result:

ok 1 number(s): "696388498"

Test #20:

score: -100
Wrong Answer
time: 104ms
memory: 22552kb

input:

10000 123456

output:

461866116

result:

wrong answer 1st numbers differ - expected: '434296902', found: '461866116'