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Speech Patterns

题目链接：1071 Speech Patterns (25 point(s))

题干大意

统计出现次数最多的单词

思路

统计单词数，也就是要分割单词，这里注意单词有大小写字母和数字组成，以及对非有效字符的判断

AC代码

C++
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#include <iostream>
#include <map>
using namespace std;

int main()
{
    map<string, int> count;
    string           str;
    getline(cin, str);
    int i = 0;
    while (i < str.length()) {
        string word;
        while (i < str.length() && isalnum(str[i])) {
            if (str[i] >= 'A' && str[i] <= 'Z') // 改为小写
                str[i] += 32;
            word += str[i++];
        }
        if (!word.empty()) { // 统计出是个单词
            if (count.find(word) == count.end())
                count[word] = 1;
            else
                ++count[word];
        }
        while (i < str.length() && !isalnum(str[i]))
            ++i; // 跳过非单词字符
    }
    string ans;
    int    max = 0;
    for (auto& it : count) {
        if (it.second > max) {
            max = it.second;
            ans = it.first;
        }
    }
    cout << ans << " " << max;
    return 0;
}