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cc_TASHIFT.cpp
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cc_TASHIFT.cpp
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/* Ankit Srivastava */
#include <bits/stdc++.h>
using namespace std;
#define MOD 1000000007
#define pb(x) push_back(x)
#define mp(x,y) make_pair(x,y)
#define FF first
#define SS second
#define s(n) scanf("%d",&n)
#define sl(n) scanf("%lld",&n)
#define sf(n) scanf("%lf",&n)
#define ss(n) scanf("%s",n)
#define sc(n) {char temp[4]; ss(temp); n=temp[0];}
#define INF (int)1e9
#define LINF (long long)1e18
#define EPS 1e-9
#define maX(a,b) ((a)>(b)?(a):(b))
#define miN(a,b) ((a)<(b)?(a):(b))
#define abS(x) ((x)<0?-(x):(x))
typedef long long ll;
typedef unsigned long long LL;
typedef pair<int,int> PII;
typedef pair<LL,LL> PLL;
typedef pair<int,PII> TRI;
typedef vector<int> VI;
typedef vector<LL> VL;
typedef vector<ll> vl;
typedef vector<PII> VII;
typedef vector<TRI> VT;
int n;
char a[3000006], b[1000001];
int TEST_NO;
void precompute() {
}
void read() {
s(n);
scanf("%s", a);
scanf("%s", b);
strcat(a, b);
strcat(a, b);
a[3 * n] = '\0';
}
vector<int> getZfunc(char *s, int len) {
int L = 0, R = 0;
vector<int> z(len, 0);
z[0] = len;
for (int i = 1; i < len; i++) {
if (i > R) {
L = R = i;
while (R < len && s[R - L] == s[R]) 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 < len && s[R - L] == s[R]) R++;
z[i] = R - L;
R--;
}
}
}
return z;
}
void preprocess() {
}
void solve() {
std::vector<int> pre = getZfunc(a, 3 * n);
//puts("done!");
int ind = n;
for (int i = n; i < 2 * n; ++i) {
if(pre[i] > pre[ind]) ind = i;
}
printf("%d\n", ind - n);
}
int main() {
precompute();
int t;
t = 1;
for(TEST_NO = 1; TEST_NO <= t; TEST_NO ++) {
read();
preprocess();
solve();
}
return 0;
}