getline第二次的输入

#include<iostream>
#include<string>
using namespace std;

int main()
{
    int t;
    cin>>t;
    struct vowel{
        int a;
        int e;
        int i;
        int o;
        int u;
    }s[t];
    for(int i=0; i<t; i++)
    {
        s[i].a = 0;
        s[i].e = 0;
        s[i].i = 0;
        s[i].o = 0;
        s[i].u = 0;
    }
    int n = 0;
    while(t--)
    {
        string a= "";
        cin.get();
        getline(cin,a);
        cout<<a<<endl;
        for(int i=0; a[i]!='\0'; i++)
        {
            if(a[i] == 'a')
            {
                s[n].a++;
            }
            if(a[i] == 'e')
            {
                s[n].e++;
            }
            if(a[i] == 'i')
            {
                s[n].i++;
            }
            if(a[i] == 'o')
            {
                s[n].o++;
            }
            if(a[i] == 'u')
            {
                s[n].u++;
            }
        }
        n++;
    }
    for(int i=0; i<n; i++)
    {
        cout<<"a:"<<s[i].a<<endl;
        cout<<"e:"<<s[i].e<<endl;
        cout<<"i:"<<s[i].i<<endl;
        cout<<"o:"<<s[i].o<<endl;
        cout<<"u:"<<s[i].u;
        if(i != n-1)
        {
            cout<<endl;
            cout<<endl;
        }
    }
    return 0;
}

就是当我第二次调用getline时我的string的第一个字符就被吃掉了。
大家帮忙看看什么毛病啊！附件是运行窗口。