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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#414404#5646. Uniform ChemistryAndycipationAC ✓3ms3984kbC++201.5kb2024-05-18 22:46:292024-05-18 22:46:31

Judging History

你现在查看的是最新测评结果

  • [2024-05-18 22:46:31]
  • 评测
  • 测评结果:AC
  • 用时:3ms
  • 内存:3984kb
  • [2024-05-18 22:46:29]
  • 提交

answer

/*
 * author:  ADMathNoob
 * created: 05/17/24 20:37:57
 * problem: https://qoj.ac/problem/5646
 */

/*
Comments about problem:


*/

#include <bits/stdc++.h>

using namespace std;

#ifdef _DEBUG
#include "debug.h"
#else
#define debug(...) 42
#endif

int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  // prob that i gets to n from doing the t-th fusion
  vector<vector<double>> prob(m, vector<double>(n));
  for (int i = 0; i < m; i++) {
    int s;
    cin >> s;
    --s;
    vector<vector<double>> dp(n, vector<double>(n));
    dp[0][s] = 1;
    for (int t = 0; t < n - 1; t++) {
      for (int x = 0; x < n - 1; x++) {
        double p = 1.0 / (n - 1 - x);
        for (int y = x + 1; y < n; y++) {
          dp[t + 1][y] += dp[t][x] * p;
        }
      }
    }
    for (int t = 0; t < n; t++) {
      prob[i][t] = dp[t][n - 1];
    }
  }
  vector<vector<double>> suf(m, vector<double>(n + 1));
  for (int i = 0; i < m; i++) {
    for (int t = n - 1; t >= 0; t--) {
      suf[i][t] = suf[i][t + 1] + prob[i][t];
    }
    assert(abs(suf[i][0] - 1.0) < 1e-8);
  }
  for (int i = 0; i < m; i++) {
    double ret = 0;
    for (int w = 0; w < n; w++) {
      double others = 1.0;
      for (int j = 0; j < m; j++) {
        if (j == i) {
          continue;
        }
        others *= suf[j][w];
      }
      ret += prob[i][w] * others;
    }
    cout.precision(10);
    cout << fixed;
    cout << ret << " \n"[i == m - 1];
  }
  return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 1ms
memory: 3776kb

input:

2 3
1 1 1

output:

1.0000000000 1.0000000000 1.0000000000

result:

ok 3 numbers, max absolute error 0

Test #2:

score: 0
Accepted
time: 1ms
memory: 3820kb

input:

3 3
1 1 2

output:

0.5000000000 0.5000000000 1.0000000000

result:

ok 3 numbers, max absolute error 0

Test #3:

score: 0
Accepted
time: 1ms
memory: 3752kb

input:

3 3
1 1 1

output:

0.6250000000 0.6250000000 0.6250000000

result:

ok 3 numbers, max absolute error 0

Test #4:

score: 0
Accepted
time: 2ms
memory: 3876kb

input:

100 7
1 2 4 8 16 32 64

output:

0.1785934686 0.1798104547 0.1823067706 0.1875653656 0.1993004295 0.2293563224 0.3487225179

result:

ok 7 numbers, max absolute error 5.00000014e-10

Test #5:

score: 0
Accepted
time: 3ms
memory: 3960kb

input:

100 10
28 58 38 53 1 19 66 60 68 31

output:

0.1320312447 0.1954783754 0.1472783260 0.1801694505 0.1044952834 0.1211120330 0.2277441756 0.2025068243 0.2379248933 0.1362072688

result:

ok 10 numbers, max absolute error 4.86312102e-11

Test #6:

score: 0
Accepted
time: 0ms
memory: 3920kb

input:

100 10
86 50 88 42 88 20 29 83 89 34

output:

0.2633535451 0.0960168456 0.2973462847 0.0852667612 0.2973462847 0.0658616476 0.0724970696 0.2259810388 0.3184278057 0.0768756085

result:

ok 10 numbers, max absolute error 4.29709601e-11

Test #7:

score: 0
Accepted
time: 1ms
memory: 3840kb

input:

2 1
1

output:

1.0000000000

result:

ok found '1.000000000', expected '1.000000000', error '0.000000000'

Test #8:

score: 0
Accepted
time: 1ms
memory: 3984kb

input:

10 3
4 6 7

output:

0.3721354167 0.5234953704 0.6678433642

result:

ok 3 numbers, max absolute error 3.33333916e-11

Test #9:

score: 0
Accepted
time: 1ms
memory: 3832kb

input:

20 10
6 6 9 3 14 15 13 8 6 11

output:

0.1519177372 0.1519177372 0.1871464692 0.1284275431 0.3162342034 0.3704345703 0.2766977534 0.1735820763 0.1519177372 0.2226133627

result:

ok 10 numbers, max absolute error 4.67095806e-11

Test #10:

score: 0
Accepted
time: 1ms
memory: 3984kb

input:

99 2
40 55

output:

0.5366140249 0.6295926938

result:

ok 2 numbers, max absolute error 4.64274175e-11

Test #11:

score: 0
Accepted
time: 3ms
memory: 3832kb

input:

99 9
86 68 85 83 75 70 71 73 70

output:

0.2945741171 0.1492344902 0.2780294762 0.2505140657 0.1824354299 0.1572638754 0.1616578500 0.1713381716 0.1572638754

result:

ok 9 numbers, max absolute error 4.65337768e-11