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QOJ
| 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 |
|---|---|---|---|---|---|---|---|---|---|
| #69570 | #2440. Valentine's Day | he_ren_shi_lyp# | AC ✓ | 155ms | 3884kb | C++23 | 625b | 2022-12-28 18:33:30 | 2022-12-28 18:33:32 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 50;
long double p[N];
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
int T;
cin >> T;
cout << fixed << setprecision(20);
while (T--) {
int n;
cin >> n;
for (int i = 1; i <= n; ++i)
cin >> p[i];
sort(p + 1, p + n + 1, greater<long double>());
long double p0 = 1, p1 = 0;
for (int i = 1; i <= n; ++i) {
long double q0 = p0 * (1 - p[i]);
long double q1 = p0 * p[i] + p1 * (1 - p[i]);
if (q1 > p1) {
p0 = q0;
p1 = q1;
}
}
cout << p1 << '\n';
}
}
详细
Test #1:
score: 100
Accepted
time: 155ms
memory: 3884kb
input:
100 10 0.020874 0.180969 0.015588 0.043033 0.181293 0.033025 0.163341 0.104341 0.065442 0.129546 10 0.019357 0.210598 0.045487 0.051145 0.014579 0.135566 0.004401 0.008004 0.106695 0.056974 10 0.062679 0.216144 0.010137 0.031823 0.233062 0.042464 0.099544 0.140483 0.201337 0.045349 100 0.116404 0.19...
output:
0.39819007148890732525 0.37368388645907640552 0.41088536275849987464 0.42137404437828100437 0.41987297101569753056 0.42106225701885684705 0.42079685802045167287 0.41989089757572841045 0.41986039320215500805 0.00009999010048508432 0.00000000000000000000 0.00334100000000000000 0.00333600000000000000 0...
result:
ok 100 numbers