ЗОШ Префикс-функция ОК

#include <iostream>
#include <cmath>
#include <vector>
#include <queue>
#include <algorithm>
#include <string>
#include <stack>
#include <set>
#include <map>
#define pii pair <int,int>
using namespace std;
using ll = long long;
using ld = long double;
using db = double;
void cv(vector <int> &v){
    for (auto x: v) cout<<x<<' ';
    cout<<"\n";
}

void cvl(vector <ll> &v){
    for (auto x: v) cout<<x<<' ';
    cout<<"\n";
}


void cvv(vector <vector <int> > &v){
    for (auto x: v) cv(x);
    cout<<"\n";
}

int main()
{
    ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	string S; cin>>S; int n = S.size();
	pii lr; int l,r;
	vector <int> P(n, 0);
	for (int i = 1; i <n;++i){
        int j = P[i-1];
        while (j > 0 && S[j] != S[i]){
            j = P[j-1];
        }
        if (S[i] == S[j]){
            ++j;
        }
        P[i] = j;
	}
	cv(P);
}