求助 WA on subtask #0 #2

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

const long long int MAXN=2000001;
string str[MAXN];

int wei(int num)
{
    int ans=1;
    while(num/=10)
    {
        ans++;
    }
    return ans;
}

int main()
{
    string line;
    long long int lineNumber = 0;
    while(getline(cin, str[++lineNumber])){}
    int s=wei(lineNumber);
    for(int i=1; i<lineNumber; i++)
    {
        int t=wei(i);
        string backp="";
        for(int j=0; j<s-t; j++)
            backp=" "+backp;
        str[i]=backp+ to_string(i)+" " +str[i];
        cout<<str[i]<<endl;
    }
    return 0;
}