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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
#305930#5464. Dice GameckisekiTL 54ms4808kbC++203.0kb2024-01-16 06:12:122024-01-16 06:12:12

Judging History

你现在查看的是最新测评结果

  • [2024-01-16 06:12:12]
  • 评测
  • 测评结果:TL
  • 用时:54ms
  • 内存:4808kb
  • [2024-01-16 06:12:12]
  • 提交

answer

#include <bits/stdc++.h>

using namespace std;

const int mod = 998244353;

int modpow(int64_t e, int p) {
    int64_t r = 1;
    while (p) {
        if (p & 1) r = r * e % mod;
        e = e * e % mod;
        p >>= 1;
    }
    return r;
}

vector<pair<int64_t,int>> gen(int64_t h[]) {
    vector<pair<int64_t,int>> ret, u, v;
    ret.reserve(1 << 15);
    u.reserve(1 << 15);
    v.reserve(1 << 15);

    ret.emplace_back(0, 0);

    for (int i = 15 - 1; i >= 0; i--) {
        u.clear();
        v.clear();
        for (size_t j = 0; j < ret.size(); j++) {
            u.emplace_back(ret[j].first - h[i], ret[j].second + (1 << i));
            v.emplace_back(ret[j].first + h[i], ret[j].second);
        }
        ret.resize(u.size() + v.size());
        merge(u.begin(), u.end(), v.begin(), v.end(), ret.begin());
    }
    return ret;
}

void solve(int n) {
    int64_t h[30];
    for (int i = 0; i < 30; i++) {
        int L = (1 << i);
        // h[i] = ((n - 1) / L + 1) / 2;
        h[i] = (n / L) / 2 * L + 
            
            ((n / L) % 2 == 1 ? n % L : 0);
    }

    // for (int i = 0; i < 30; i++) {
    //     int cnt = 0;
    //     for (int j = 0; j < n; j++) {
    //         cnt += (j >> i & 1);
    //     }
    //     // h[i] = cnt;
    //     cerr<<cnt<<','<<h[i]<<' '<<n<<endl;
    //     assert (cnt == h[i]);
    // }

    // return;

    for (int i = 0; i < 30; i++)
        h[i] <<= i;


    auto lo = gen(h);
    auto hi = gen(h + 15);
    // cerr << "|lo| = " << lo.size() << endl;
    // cerr << "|hi| = " << hi.size() << endl;

    reverse(lo.begin(), lo.end());

    const int L = (n >> 15);

    size_t it = 0;
    int64_t sum = 0;
    int64_t cnt = 0;
    int64_t ans = 0;
    // for (auto [s1, k1]: hi) {
    //     if (k1 <= 1) {
    //         for (auto [s2, k2]: lo) {
    //             if (s1 + s2 > 0 && (k1 << 15) + k2 < n) {
    //                 ans += s1 + s2;
    //             }
    //             // if ((k1 << 15) + k2 < n)
    //             //     cerr << s1 + s2 << ' ' << k1 << ' ' << k2 << endl;
    //         }
    //     }
    // }

    for (auto [s1, k1]: hi) {
        while (it < lo.size() && lo[it].first + s1 > 0) {
            sum += lo[it].first;
            cnt += 1;
            ++it;
        }
        if (k1 < L) {
            ans = (ans + s1 * cnt + sum) % mod;
        } else if (k1 == L) {
            for (auto [s2, k2]: lo) {
                if (s1 + s2 > 0 && (k1 << 15) + k2 < n) {
                    ans = (ans + s1 + s2) % mod;
                }
            }
        }
    }

    // cerr << "n = " << n <<  endl;
    // cerr << "ans = " << ans << endl;
    ans = 1LL * ans * modpow(1LL * n * n, mod - 2) % mod;
    ans = (ans + 1LL * (n - 1) * modpow(2, mod - 2)) % mod;
    cout << ans << '\n';
}


signed main() {
    cin.tie(nullptr) -> sync_with_stdio(false);
    int T;
    cin >> T;
    while (T--) {
        int n;
        cin >> n;
        solve(n);
    }
}

详细

Test #1:

score: 100
Accepted
time: 0ms
memory: 4808kb

input:

4
1
2
3
4

output:

0
249561089
776412276
2

result:

ok 4 number(s): "0 249561089 776412276 2"

Test #2:

score: 0
Accepted
time: 54ms
memory: 4732kb

input:

100
119
75
29
10
17
29
449
71
72
12
79
117
83
80
35
272
105
497
346
287
362
140
297
167
111
419
210
212
170
413
373
210
196
39
1
101
258
496
333
293
392
2
187
431
157
342
436
106
449
136
378
243
357
325
237
254
22
292
62
435
18
446
471
18
42
377
181
350
19
389
212
58
45
70
52
63
107
71
66
355
381
30...

output:

645006489
296012775
400009943
299473312
221064504
400009943
60548260
896063466
573066250
471393174
175624519
531171954
143020402
134763040
560646647
43176836
269095960
284396636
191400715
895243672
967774080
745220060
584864173
5941827
724073586
701650152
262576881
417830609
833275086
916357319
1435...

result:

ok 100 numbers

Test #3:

score: 0
Accepted
time: 10ms
memory: 4724kb

input:

10
321
4212
2977
3438
679
2518
3359
2348
861
1853

output:

115992677
210903174
216412050
780704799
956649209
200804004
267658252
194263892
880330717
328032438

result:

ok 10 numbers

Test #4:

score: 0
Accepted
time: 7ms
memory: 4728kb

input:

12
3324
3167
3780
2887
1541
494
4374
3416
4036
3637
3888
4630

output:

458228110
29999980
333283438
544178470
753289945
257353919
515561689
628492255
799560584
924311157
17047279
109086825

result:

ok 12 numbers

Test #5:

score: -100
Time Limit Exceeded

input:

10000
11424730
231352165
835903988
101946284
358678826
610737477
100503274
909725926
510714513
407317433
668332866
442951503
582321912
117772499
180141789
570384258
375362779
724696666
959258227
178470161
245672142
629464136
515375633
58812672
119047157
272587596
993112981
678095944
67996298
2717673...

output:

684037877
621784086
775115168
592320243
465168348
812154766
695423679
812830487
599736098
722561844
301372415
163406712
803501689
705975922
877364585
293106070
328629743
894941470
506248280
672648134
768749560
149447356
82631461
473124021
722052172
778328876
747239770
212335591
854308646
143332855
6...

result: