Z-array

#include <iostream>
#include <vector>
#include <string>

using namespace std;

int main() {
    string s;
    cin >> s;
    int n = s.length();
    vector<int> Z(n);
    
    Z[0] = n;
    int l = 0, r = 0;

    for (int i = 1; i < n; i++) {
        if (i > r) {
            l = r = i;
            while (r < n && s[r] == s[r - l]) {
                r++;
            }
            Z[i] = r - l;
            r--;
        } else {
            int k = i - l;
            if (Z[k] < r - i + 1) {
                Z[i] = Z[k];
            } else {
                l = i;
                while (r < n && s[r] == s[r - l]) {
                    r++;
                }
                Z[i] = r - l;
                r--;
            }
        }
    }

    for (int i = 0; i < n; i++) {
        cout << Z[i];
        if (i < n - 1) cout << " ";
    }
    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