Submission #953978

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;  
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) for(int i=0;i<(n);i++)  
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
#define pii pair<int,int>
#define piii pair<int,pii>
#define mp make_pair
#define pb push_back  
#define ALL(a) (a).begin(),(a).end()
#define FST first
#define SEC second  
const int INF = (INT_MAX/2);
const double eps = 1e-14;
const double PI = M_PI;  
#define DEB cout<<"!"<<endl
#define SHOW(a,b) cout<<(a)<<" "<<(b)<<endl  
#define DIV 1000000009  
int main(){
	int N;
	cin >> N;
	string s1,s2;
	cin >> s1 >> s2;
	
	for(int i = 0; i < N; i++){
		if(s1.substr(i,N) == s2.substr(0,N - i)){
			cout << 2 * N - ( N - i)  << endl;
			return 0;
		}
	}
	cout << 2 * N << endl;
	return 0;
}

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