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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
#213365#2053. 地雷爆炸STASISZHY1003668ms1992kbC++111.2kb2024-11-11 20:22:502024-11-11 23:03:38

answer

// Problem: A. 地雷爆炸
// Contest: undefined - NOIP2024训练赛 02
// URL: http://119.28.3.174/contest/1154/problem/2053
// Memory Limit: 1024 MB
// Time Limit: 1000 ms
// 
// Powered by CP Editor (https://cpeditor.org)

#include<bits/stdc++.h>
//#define int long long
#define fi first
#define se second
#define PII pair<int, int>

using namespace std;

const int N = 1e5 + 10, M = 1e6 + 10, mod = 1e9 + 7, INF = 0x3f3f3f3f;

int n, m, q, ans;
long double s[N], dp[305][405], eps;

void dfs(int id, int now, int nd, long double f, int sum)
{
	if(f < eps) return;
	if(now > nd)
	{
		if(sum <= 400) dp[id][sum] += f;
		return;
	}
	for(int i = 0; i < n; i ++) dfs(id, now + 1, nd, f * s[i], sum + i - 1);
}

signed main()
{
	// ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	// cin >> n >> m;
	scanf("%d %d", &n, &m); 
	if(n <= 6 && m <= 6) eps = 2e-9;
	else eps = 1e-6;
	for(int i = 0; i < n; i ++) scanf("%LF", &s[i]);
	// for(int i = 0; i < n; i ++) cout << s[i] << ' ';
	dp[0][1] = 1.0;
	for(int i = 1; i <= m; i ++)
	{
		dp[i][0] = dp[i - 1][0];
		for(int j = 1; j <= 400; j ++) dfs(i, 1, j, dp[i - 1][j], j); 
		// cout << dp[i][0] << '\n';
	}
	printf("%.4Lf", dp[m][0]);
	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: 680ms
memory: 1348kb

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: 850ms
memory: 1548kb

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: 1268kb

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: 635ms
memory: 1408kb

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: 491ms
memory: 1992kb

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: 491ms
memory: 1580kb

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: 521ms
memory: 1356kb

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: 1276kb

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: 1260kb

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: 1268kb

input:

6 3
1 0 0 0 0 0

output:

1.0000

result:

ok single line: '1.0000'