acwing 3199

#include<bits/stdc++.h>
using namespace std;

const int N = 30;
bool y[N], n[N];
string res[N];

int main()
{
    string str;
    cin >> str;
    for(int i = 0; i < str.size(); i ++)
        if(i + 1 < str.size() && str[i+1] == ':') y[str[i++]-'a'] = true;
        else n[str[i]-'a'] = true;

    int t;
    cin >> t;
    getchar();
    for(int i = 1; i <= t; i ++)
    {
        printf("Case %d: ", i);
        getline(cin, str);
        stringstream ss(str);
        vector<string> v;
        while(ss >> str) v.push_back(str);
        for(int i = 0; i < 26; i ++) res[i].clear();
        for(int i = 1; i < v.size(); i ++)
        {
            string u = v[i];
            if(u.size() != 2 || u[0] != '-' || u[1] < 'a' || u[1] > 'z') break;
            if(n[u[1]-'a']) res[u[1]-'a'] = "yep";
            else if(y[u[1]-'a'] && i + 1 < v.size()) res[u[1]-'a'] = v[++i];
            else break;
        }
        for(int i = 0; i < 26; i ++)
            if(res[i].size())
            {
                printf("-%c ", (char)(i + 'a'));
                if(y[i]) cout << res[i] << ' ';
            }
        printf("\n");
    }
}

注意事项

1 用getchar()把用getline之前的回车读掉
2 用法

string s;
getline(cin, s);
stringstream ss(s);
while(s >> ss){
    do something
}

3 可以把每段字符串送到vector里

vector<string> vs;
while(s >> ss) vs.push_back(ss);