A1071 Speech Patterns [map]

题意：统计由数字和字母组成的“个数”，找出出现频率最高的那个。
思路：对一个单词一个单词的扫描进map记数

#include<vector>
#include<iostream>
#include<algorithm>
#include<unordered_map>
#include<set>
#include<map>
#include<cstring>
#include<string>
using namespace std;
bool check(char c)
{
	if (c >= '0' && c <= '9')
		return true;
	if (c >= 'A' && c < 'Z')
		return true;
	if (c >= 'a' && c <= 'z')
		return true;
	return false;
}
bool cmp(pair<string,int> p1, pair<string,int> p2)
{
    return p1.second > p2.second;
}
int main()
{
	map<string, int>count;
	string str;
	getline(cin, str);
	int i = 0;
	while (i < str.length())
	{
		string word;
		while (i < str.length() && check(str[i]))
		{
			if (str[i] >= 'A' && str[i] <= 'Z')
				str[i] += 32;
			word += str[i];
			i++;
		}
		if (count.find(word) == count.end())
			count[word] = 1;
		else
			count[word]++;
		while (i < str.length() && !check(str[i]))
			i++;
	}
	vector<pair<string, int> >vpr;
	for (map<string, int>::iterator it = count.begin(); it != count.end(); it++)
	{
		vpr.push_back(make_pair(it->first, it->second));
	}
	sort(vpr.begin(), vpr.end(),cmp);
	auto it = vpr.begin();
	cout << it->first << " " << it->second << '
';
}