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(cpp/string/char_count.hpp)

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• Last update: 2024-10-19 16:46:12+09:00
• Include: #include "cpp/string/char_count.hpp"

char_count

vector<pair<char, int>> char_count(const string &s)

制約

文字はASCIIに含まれる。

計算量

• $ O(

  S

  ) $

例

char_count("")
// -> []

char_count("abc")
// -> [('a', 1), ('b', 1), ('c', 1)]

char_count("aaaAAABBbb")
// -> [('a', 3), ('A', 3), ('B', 2), ('b', 2)]

Depends on

• 共通ヘッダー (cpp/template/small_template.hpp)

Code

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

// 文字、個数
vector<pair<char, int>> char_count(const string &s) {
  vector<pair<char, int>> ret;
  int n = s.size();
  if (n == 0) {
    return ret;
  }
  char pre = s[0];
  int cnt = 0;
  for (int i = 0; i < n; i++) {
    if (pre == s[i]) {
      cnt++;
    } else {
      ret.emplace_back(pre, cnt);
      pre = s[i];
      cnt = 1;
    }
  }
  ret.emplace_back(pre, cnt);
  return ret;
}

Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.12.0/x64/lib/python3.12/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/3.12.0/x64/lib/python3.12/site-packages/onlinejudge_verify/languages/cplusplus.py", line 187, in bundle
    bundler.update(path)
  File "/opt/hostedtoolcache/Python/3.12.0/x64/lib/python3.12/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/3.12.0/x64/lib/python3.12/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: template/small_template.hpp: line -1: no such header

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