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## Discussion of Problem 1423. String Tale

accepted
Posted by Mikhail 20 Jun 2018 20:48
//#pragma GCC optimize("Ofast,no-stack-protector")
//#pragma GCC target("avx")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace __gnu_pbds;
using namespace std;

#define re return
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define fi first
#define se second
#define sqrt(x) sqrt(abs(x))
#define mp make_pair
#define pi (3.14159265358979323846264338327950288419716939937510)
#define fo(i, n) for(int i = 0; i < n; ++i)
#define ro(i, n) for(int i = n - 1; i >= 0; --i)
#define unique(v) v.resize(unique(all(v)) - v.begin())

template <class T> T abs (T x) { re x > 0 ? x : -x; }
template <class T> T sqr (T x) { re x * x; }
template <class T> T gcd (T a, T b) { re a ? gcd (b % a, a) : b; }
template <class T> int sgn (T x) { re x > 0 ? 1 : (x < 0 ? -1 : 0); }

typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef vector<string> vs;
typedef double D;
typedef long double ld;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef vector<ll> vll;
typedef unsigned long long ull;
typedef tree <pair<int, char>, null_type, less<pair<int, char>>, rb_tree_tag, tree_order_statistics_node_update> _tree;

void Z_function (string &str, vi &z) {
int n = str.size();
z.resize(n, 0);
for (int i = 1, l = 0, r = 0; i < n; ++i) {
if (i <= r) {
z[i] = min(r - i + 1, z[i - l]);
}
while (i + z[i] < n && str[z[i]] == str[i + z[i]]) ++z[i];
if (i + z[i] - 1 > r) l = i, r = z[i] + i - 1;
}
}

string str, s;
vi z;

int main() {
int n;
cin >> n >> str >> s;
str += '\$'; str += s; str += s;
Z_function(str, z);
fo(i, (int)z.size()) {
if (z[i] == n) {
cout << i - n - 1 << endl;
re 0;
}
}
cout << -1 << endl;
re 0;
}