tools/inversion.hpp

• View this file on GitHub
• Last update: 1970-01-01 00:00:00+00:00
• Include: #include "tools/inversion.hpp"

Code

#pragma once

#include "../data-structure/fenwick-tree.hpp"
#include "./base.hpp"

#include <vector>

namespace matumoto {
  // verify:AOJ_ALDS1_5_D
  template <typename T>
  long long inversion(vector<T> vs) {
    auto uni = vs;
    sort(uni.begin(), uni.end());
    uni.erase(unique(uni.begin(), uni.end()), uni.end());
    for (T &v: vs) {
      v = lower_bound(uni.begin(), uni.end(), v) - uni.begin();
    }

    int n = vs.size();
    data_structure::FenwickTree<long long> ft(n + 1);
    long long res = 0;
    for (T v: vs) {
      res += ft.sum(v + 1, n);
      ft.add(v, 1);
    }
    return res;
  }
} // namespace matumoto

Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.11.4/x64/lib/python3.11/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/3.11.4/x64/lib/python3.11/site-packages/onlinejudge_verify/languages/cplusplus.py", line 187, in bundle
    bundler.update(path)
  File "/opt/hostedtoolcache/Python/3.11.4/x64/lib/python3.11/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/3.11.4/x64/lib/python3.11/site-packages/onlinejudge_verify/languages/cplusplus_bundle.py", line 260, in _resolve
    raise BundleErrorAt(path, -1, "no such header")
onlinejudge_verify.languages.cplusplus_bundle.BundleErrorAt: ../data-structure/fenwick-tree.hpp: line -1: no such header

Back to top page