华为OJ：字符串处理

#include <iostream>
#include <stdlib.h>
#include <string>
#include <sstream>
#include <vector>
using namespace std;

int main()
{
    string s;
    getline(cin, s);
    for (auto it = s.begin(); it != s.end(); it++)
    {
        if (!isalpha(*it))
            (*it) = ' ';
    }

    istringstream ss(s);
    string tmp;
    vector<string>ans;
    while (ss>>tmp)
    {
        tmp[0] = toupper(tmp[0]);
        ans.push_back(tmp);
        //tmp.clear();
    }
    (ans.back()).insert((ans.back()).end(), '.');
    for (auto it = ans.begin(); it != ans.end(); it++)
    {
        if (it == prev(ans.end()))
            cout << *it;
        else
            cout << *it << ' ';
    }
    system("pause");
    return 0;
}