1071. Speech Patterns (25)

本文介绍了一道词频统计题的解决方法,通过使用C++实现,具体步骤包括读取输入字符串、转换为统一格式、分割单词并计数,最终输出出现频率最高的单词及其出现次数。

1. 原题: https://www.patest.cn/contests/pat-a-practise/1071

2. 思路:

题意:
词频统计题。输出一行字符串中出现频率最高的单词及次数(不区分大小写)。
思路:
先把字符串保存到string s里,
然后遍历每个字符,不是字母或数字,置为空格。
然后把s读入字符串流ss里,输出每个单词,插入map。
其中map的key是单词,value是次数。
最后输出即可。
已AC。

3. 源码:

#include<iostream>
#include<string>
#include<sstream>//使用字符串流, 用于转换成单词
#include<cctype>//使用iisalnum函数, 判断是否字母或数字
#include<map>
using namespace std;

int main(void)
{
	//freopen("in.txt", "r", stdin);
	string s;
	getline(cin, s);//读入一行
	for (int i = 0; i < s.size(); i++)
	{
		s[i] = tolower(s[i]);//转换成小写
		if (!isalnum(s[i]))
			s[i] = ' ';//无效字符,置为空格
	}

	string re;//保存结果的单词
	int cnt = 0;
	map<string, int> word;
	stringstream ss(s);//字符串流ss
	while (ss >> s)//字符串流一次读出一个单词,遇到空格截止。
	{
		if (word.count(s) == 0)
			word[s] = 0;
		word[s]++;

		if (cnt < word[s])//记录最大次数
		{
			cnt = word[s];
			re = s;
		}
		else if (cnt == word[s] && s < re)
			re = s;
	}
	cout << re << ' ' << cnt << endl;

	return 0;
}


hqyj@ubuntu:~/Qt5.12.12/5.12.12/gcc_64/lib$ hqyj@ubuntu:~/Qt5.12.12/5.12.12/gcc_64/lib$ ls Qt5RepParser.la libQt5PlatformCompositorSupport.a Qt5UiPlugin.la libQt5PlatformCompositorSupport.la cmake libQt5PlatformCompositorSupport.prl libQt53DAnimation.la libQt5Positioning.la libQt53DAnimation.prl libQt5Positioning.prl libQt53DAnimation.so libQt5Positioning.so libQt53DAnimation.so.5 libQt5Positioning.so.5 libQt53DAnimation.so.5.12 libQt5Positioning.so.5.12 libQt53DAnimation.so.5.12.12 libQt5Positioning.so.5.12.12 libQt53DCore.la libQt5PositioningQuick.la libQt53DCore.prl libQt5PositioningQuick.prl libQt53DCore.so libQt5PositioningQuick.so libQt53DCore.so.5 libQt5PositioningQuick.so.5 libQt53DCore.so.5.12 libQt5PositioningQuick.so.5.12 libQt53DCore.so.5.12.12 libQt5PositioningQuick.so.5.12.12 libQt53DExtras.la libQt5PrintSupport.la libQt53DExtras.prl libQt5PrintSupport.prl libQt53DExtras.so libQt5PrintSupport.so libQt53DExtras.so.5 libQt5PrintSupport.so.5 libQt53DExtras.so.5.12 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libQt5MultimediaWidgets.so.5.12.12 libicudata.so.56.1 libQt5Network.la libicui18n.so libQt5Network.prl libicui18n.so.56 libQt5Network.so libicui18n.so.56.1 libQt5Network.so.5 libicuio.so libQt5Network.so.5.12 libicuio.so.56 libQt5Network.so.5.12.12 libicuio.so.56.1 libQt5Nfc.la libicule.so libQt5Nfc.prl libicule.so.56 libQt5Nfc.so libicule.so.56.1 libQt5Nfc.so.5 libiculx.so libQt5Nfc.so.5.12 libiculx.so.56 libQt5Nfc.so.5.12.12 libiculx.so.56.1 libQt5OpenGL.la libicutest.so libQt5OpenGL.prl libicutest.so.56 libQt5OpenGL.so libicutest.so.56.1 libQt5OpenGL.so.5 libicutu.so libQt5OpenGL.so.5.12 libicutu.so.56 libQt5OpenGL.so.5.12.12 libicutu.so.56.1 libQt5OpenGLExtensions.a libicuuc.so libQt5OpenGLExtensions.la libicuuc.so.56 libQt5OpenGLExtensions.prl libicuuc.so.56.1 libQt5PacketProtocol.a libqtlibpng.a libQt5PacketProtocol.la libqtlibpng.prl libQt5PacketProtocol.prl pkgconfig hqyj@ubuntu:~/Qt5.12.12/5.12.12/gcc_64/lib$ Qt生成远程OTA升级压缩包的库要加那些啊?
07-18
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