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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#533216#8795. Mysterious SequencedeepthoughtWA 0ms3908kbC++231.1kb2024-08-25 18:42:052024-08-25 18:42:05

Judging History

你现在查看的是最新测评结果

  • [2024-08-25 18:42:05]
  • 评测
  • 测评结果:WA
  • 用时:0ms
  • 内存:3908kb
  • [2024-08-25 18:42:05]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
int32_t main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    double a, b, x1, xn;
    int n;
    cin >> a >> b >> n >> x1 >> xn;
    assert(n > 1);
    if(n == 2) {
        cout << x1 << endl << xn << endl;
        return 0;
    }
    double lo = -1e9;
    double hi = 1e9;
    double prec = 1e-9;
    while(hi - lo > prec) {
        double mid = lo + (hi - lo) / 2.0;
        double xs[n + 1];
        xs[1] = x1;
        xs[2] = mid;
        for(int i = 3; i <= n; i++) {
            xs[i] = a * xs[i - 1] + b * xs[i - 2];
        }
        if(abs(xs[n] - xn) / (max(1.0, xn)) < prec) break;
        else if(xs[n] > xn) hi = mid;
        else if(xs[n] < xn) lo = mid;
    }
    double ans[n + 1];
    ans[1] = x1;
    ans[n] = xn;
    ans[2] = lo;
    cout << x1 << endl << fixed << setprecision(9) << lo << endl;
    for(int i = 3; i < n; i++) {
        ans[i] = a * ans[i - 1] + b * ans[i - 2];
        cout << fixed << setprecision(9) << ans[i] << endl;
    }
    cout << xn << endl;
}



Details

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Test #1:

score: 100
Accepted
time: 0ms
memory: 3900kb

input:

1.0 1.0 10 1 10

output:

1
-0.323529425
0.676470575
0.352941149
1.029411724
1.382352873
2.411764596
3.794117469
6.205882065
10.000000000

result:

ok 10 numbers

Test #2:

score: 0
Accepted
time: 0ms
memory: 3908kb

input:

1 1 2 1 100

output:

1
100

result:

ok 2 numbers

Test #3:

score: -100
Wrong Answer
time: 0ms
memory: 3812kb

input:

1 1 5 50 100

output:

50
-1000000000.000000000
-999999950.000000000
-1999999950.000000000
100.000000000

result:

wrong answer 2nd numbers differ - expected: '0.0000000', found: '-1000000000.0000000', error = '1000000000.0000000'