关于RE

#include<bits/stdc++.h>
#define int long long
using namespace std;
string st[100005];
int n,cnt,len,m; 
signed main(){
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	while(getline(cin,st[++n])) {
		len=max(len,st[n].size()*1ll);
	}
	n--;
	for(int i=1;i<=len+2;i++) cout<<"*";
	cout<<endl;
	for(int i=1;i<=n;i++) {
		m=len-st[i].size();
		if(m%2) {
			cnt++;
			if(cnt%2) {
				cout<<"*";
				for(int j=1;j<=m/2;j++) cout<<" ";
				cout<<st[i];
				for(int j=1;j<=m/2+1;j++) cout<<" ";
				cout<<"*";
			}
			else {
				cout<<"*";
				for(int j=1;j<=m/2+1;j++) cout<<" ";
				cout<<st[i];
				for(int j=1;j<=m/2;j++) cout<<" ";
				cout<<"*";
			}
		}
		else {
			cout<<"*";
			for(int j=1;j<=m/2;j++) cout<<" ";
			cout<<st[i];
			for(int j=1;j<=m/2;j++) cout<<" ";
			cout<<"*";
		}
		cout<<endl;
	}
	for(int i=1;i<=len+2;i++) cout<<"*";
 	return 0;
}