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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
#232910#6410. Classical DP ProblemteamariaaWA 0ms3844kbC++141.7kb2023-10-31 00:32:032023-10-31 00:32:04

Judging History

你现在查看的是最新测评结果

  • [2023-10-31 00:32:04]
  • 评测
  • 测评结果:WA
  • 用时:0ms
  • 内存:3844kb
  • [2023-10-31 00:32:03]
  • 提交

answer

#include <bits/stdc++.h>

using namespace std;

const int mod = 998244353;

long long n, k, extra, answer;
vector <long long> len, height;

/// PUNE MODUL

long long solve(vector <long long> &v)
{
    vector <vector <long long> > dp;
    dp.assign(k + 1, vector <long long> (extra + 1));

    dp[0][extra] = 1;
    for(long long i = 0; i < k; i ++)
    {
        for(long long j = extra; j >= 0; j --)
        {
            dp[i + 1][j] += 1ll *((v[i + 1] - j) * dp[i][j]) % mod;
            dp[i + 1][j] %= mod;
            if(j > 0)
            {
                dp[i + 1][j - 1] += (j * dp[i][j]) % mod;
                dp[i + 1][j - 1] %= mod;
            }
        }
    }
    return dp[k][0];
}

long long fact(long long x)
{
    long long ans = 1;
    for(long long i = 2; i <= x; i ++)
        ans = (1ll * ans * i) % mod;
    return ans;
}

int main()
{
    ios_base :: sync_with_stdio(0);
    cin.tie(0);

//    freopen(".in", "r", stdin);
//    freopen(".out", "w", stdout);

    cin >> n;
    len.resize(n); ///mortii masii
    height.resize(n + 1);

    for(long long i = 0; i < n; i ++)
        cin >> len[i];

    len.push_back(0);
    reverse(len.begin(), len.end());

    k = -1;
    for(long long i = 1; i <= n; i ++)
        k = max(k, min(len[i], i));

    cout << k << " ";

    for(long long i = 1; i <= n; i ++)
        for(long long j = 1; j <= len[i]; j ++)
            height[j] ++;


    extra = len[k + 1];
    answer = solve(len);

    extra = height[k + 1];
    answer += solve(height);
    answer %= mod;

    answer -= fact(k);
    answer %= mod;

    cout << answer;
    return 0;
}

详细

Test #1:

score: 100
Accepted
time: 0ms
memory: 3584kb

input:

3
1 2 3

output:

2 6

result:

ok 2 number(s): "2 6"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3564kb

input:

1
1

output:

1 1

result:

ok 2 number(s): "1 1"

Test #3:

score: 0
Accepted
time: 0ms
memory: 3628kb

input:

2
1 1

output:

1 2

result:

ok 2 number(s): "1 2"

Test #4:

score: -100
Wrong Answer
time: 0ms
memory: 3844kb

input:

2
2 2

output:

2 2

result:

wrong answer 2nd numbers differ - expected: '6', found: '2'