math/stirling1.hpp

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• Last update: 2021-09-12 23:20:08-04:00
• Include: #include "math/stirling1.hpp"

Depends on

• math/choose.hpp
• template.hpp

Code

#include "../template.hpp"
#include "choose.hpp"
#pragma once

// Stirling Numbers (1st kind)
// Depends on mod template
// Number of length N permutations with K disjoint cycles
template <typename T> struct Stir1 {
    vector<vector<T>> dp;
    void init(int N, int K) {
        dp.assign(N+1, vector<T>(K+1));
        dp[0][0] = 1;
        for (int i = 1; i <= N; i++)
            for (int j = 1; j <= K; j++)
                dp[i][j] = (i - 1) * dp[i - 1][j] + dp[i - 1][j - 1];
    }
    T get(int n, int k) { return dp[n][k]; }
};

Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.10.6/x64/lib/python3.10/site-packages/onlinejudge_verify/documentation/build.py", line 71, in _render_source_code_stat
    bundled_code = language.bundle(stat.path, basedir=basedir, options={'include_paths': [basedir]}).decode()
  File "/opt/hostedtoolcache/Python/3.10.6/x64/lib/python3.10/site-packages/onlinejudge_verify/languages/cplusplus.py", line 187, in bundle
    bundler.update(path)
  File "/opt/hostedtoolcache/Python/3.10.6/x64/lib/python3.10/site-packages/onlinejudge_verify/languages/cplusplus_bundle.py", line 401, in update
    self.update(self._resolve(pathlib.Path(included), included_from=path))
  File "/opt/hostedtoolcache/Python/3.10.6/x64/lib/python3.10/site-packages/onlinejudge_verify/languages/cplusplus_bundle.py", line 312, in update
    raise BundleErrorAt(path, i + 1, "#pragma once found in a non-first line")
onlinejudge_verify.languages.cplusplus_bundle.BundleErrorAt: math/choose.hpp: line 2: #pragma once found in a non-first line

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