爆0求救

#include<bits/stdc++.h>
using namespace std;
#define int long long
int T,n,a[101],b[101];
string s[101];
signed main(){
    cin>>T;
    while(T--){
        int f=0;
        cin>>n;
        for(int i=1;i<=n;i++){
            cin>>s[i];
            for(int j=1;j<s[i].size();j++){
                if(s[i][j]<s[i][j-1]) f=1;
            }
        }
        if(f==1){
            cout<<"0"<<endl;
            continue;
        }
        for(int i=1;i<=n;i++) a[i]=s[i][0]-'a'+1,b[i]=s[i][s[i].size()-1]-'a'+1;
        for(int i=1;i<n;i++){
            for(int j=1;j<=n-i;j++){
                if(a[j]>a[j+1]) swap(a[j],a[j+1]),swap(b[j],b[j+1]);
            }
        }
        for(int i=1;i<n;i++){
            if(b[i]>a[i+1]) f=1;
        }
        if(f==1) cout<<"0";
        else cout<<"1";
        cout<<endl;
    }
}