Z-array

#include <bits/stdc++.h>
 
using namespace std;
 
#define debug(x) cerr << #x << ": " << x << endl;
#define ll long long
#define ull unsigned long long
#define vi vector<int>
 
vector<ll> zarray(string s) {
    int n = s.size();
    vector<ll> z(n);
    ll x = 0, y = 0;
    z[0] = n;
    for (int i = 1; i < n; i++) {
        z[i] = max(0ll,min(z[i-x],y-i+1));
        while (i+z[i] < n && s[z[i]] == s[i+z[i]]) {
            x = i; y = i+z[i]; z[i]++;
        }
    }
    return z;
}
 
 
int main() {
    string s;
    cin >> s;
    
    vector<ll> z = zarray(s);
 
    for (auto &&i : z) cout << i << ' ';
    cout << endl;
 
    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED