NOI.AC
| 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 |
|---|---|---|---|---|---|---|---|---|---|
| #213345 | #2053. 地雷爆炸 | KXG | 100 | 0ms | 1456kb | C++11 | 560b | 2024-11-11 18:47:09 | 2024-11-11 23:01:27 |
answer
#include <cstdio>
using namespace std;
int n, m;
long double p[310];
long double dp[310][310], f[310];
int main() {
scanf("%d%d", &n, &m);
for (int i = 0; i < n; i++) {
scanf("%Lf", &p[i]);
// p[0] -= p[i];
}
dp[m][0] = 1;
f[m] = p[0];
for (int i = m - 1; i >= 0; i--) {
for (int j = 0; j <= n; j++) {
if (j == 0) dp[i][0] = 1;
else dp[i][j] = dp[i][j - 1] * f[i + 1];
f[i] += p[j] * dp[i][j];
}
}
printf("%.4Lf\n", f[1]);
return 0;
}
详细
小提示：点击横条可展开更详细的信息
Test #1:
score: 10
Accepted
time: 0ms
memory: 684kb
input:
300 20 0.00379430 0.00378180 0.00857190 0.00919620 0.00396670 0.00176760 0.00511380 0.00793840 0.005...
output:
0.0038
result:
ok single line: '0.0038'
Test #2:
score: 10
Accepted
time: 0ms
memory: 916kb
input:
300 69 0.03642550 0.00870610 0.00174390 0.00728740 0.00917590 0.00276320 0.00788090 0.00688300 0.000...
output:
0.0367
result:
ok single line: '0.0367'
Test #3:
score: 10
Accepted
time: 0ms
memory: 588kb
input:
300 1 0.02275200 0.00255280 0.00714900 0.00673530 0.00625580 0.00952860 0.00503680 0.00361520 0.0085...
output:
0.0228
result:
ok single line: '0.0228'
Test #4:
score: 10
Accepted
time: 0ms
memory: 748kb
input:
300 34 0.01174930 0.00237960 0.00725200 0.00622610 0.00092020 0.00915390 0.00050940 0.00135760 0.006...
output:
0.0118
result:
ok single line: '0.0118'
Test #5:
score: 10
Accepted
time: 0ms
memory: 1456kb
input:
300 180 0.03276550 0.00945640 0.00095320 0.00353310 0.00647080 0.00637530 0.00059110 0.00265000 0.00...
output:
0.0331
result:
ok single line: '0.0331'
Test #6:
score: 10
Accepted
time: 0ms
memory: 960kb
input:
300 78 0.07426740 0.00030970 0.00922200 0.00879440 0.00434000 0.00690410 0.00787240 0.00838550 0.005...
output:
0.0743
result:
ok single line: '0.0743'
Test #7:
score: 10
Accepted
time: 0ms
memory: 684kb
input:
300 21 0.03122890 0.00933980 0.00300750 0.00424390 0.00213370 0.00940520 0.00636220 0.00227220 0.007...
output:
0.0315
result:
ok single line: '0.0315'
Test #8:
score: 10
Accepted
time: 0ms
memory: 600kb
input:
6 4 0.64261410 0.35418080 0.00144510 0.00171790 0.00002830 0.00001380
output:
0.9831
result:
ok single line: '0.9831'
Test #9:
score: 10
Accepted
time: 0ms
memory: 592kb
input:
6 1 0.23944990 0.51892380 0.07985400 0.07066520 0.03907530 0.05203180
output:
0.2394
result:
ok single line: '0.2394'
Test #10:
score: 10
Accepted
time: 0ms
memory: 592kb
input:
6 3 1 0 0 0 0 0
output:
1.0000
result:
ok single line: '1.0000'
