Submission #4047729

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

typedef unsigned long long ull;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<double, double> pdd;
const ull mod = 1e9 + 7;
#define REP(i,n) for(int i=0;i<(int)n;++i)

//debug
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;

template < typename T >
void vprint(T &v){
	REP(i, v.size()){
		cout << v[i] << " ";
	}
	cout << endl;
}

int main(){
	ll N;
	cin >> N;
	string s, t;
	cin >> s >> t;
	REP(i, N){
		bool flag = true;
		REP(j, N){
			if(i+j>=N) continue;
			if(s[i+j]!=t[j]) flag = false;
		}
		if(flag){
			cout << i + N << endl;
			return 0;
		}
	}
	cout << 2*N << endl;
    return 0;
}

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