1195C- Basketball Excercise.cpp

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

//{
#define si(a) scanf("%d",&a)
#define sii(a,b) scanf("%d %d",&a,&b);
#define siii(a,b,c) scanf("%d %d %d",&a,&b,&c);

#define sl(a) scanf("%lld",&a)
#define sll(a,b) scanf("%lld %lld",&a,&b);
#define slll(a,b,c) scanf("%lld %lld %lld",&a,&b,&c);

#define outi(a) printf("%d\n",a)
#define outii(a,b) printf("%d %d\n",a,b)
#define outis(a) printf(" %d",a)

#define outl(a) printf("%lld\n",a)
#define outll(a,b) printf("%lld %lld\n",a,b)
#define outls(a) printf(" %lld",a)

#define cel(n,k) ((n-1)/k+1)
#define sets(a) memset(a, -1, sizeof(a))
#define clr(a) memset(a, 0, sizeof(a))
#define fr(n) for(int i=0;i<n;i++)
#define fr1(n) for(int i=1;i<=n;i++)
#define frj(n) for(int j=0;j<n;j++)
#define frj1(n) for(int j=1;j<=n;j++)
#define pb push_back
#define all(v) v.begin(),v.end()
#define mp make_pair
#define ff first
#define ss second
#define INF 10000007
#define fastIO() ios_base::sync_with_stdio(false); cin.tie(NULL);

typedef long long i64;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<long long,long long> pll;
//}

const int maxn= 1e5+5;

i64 n, k, a[2][maxn], dp[maxn][2];

i64 call(int pos, int f){
    if(pos>=n)  return 0;
    if(dp[pos][f]!=-1)  return dp[pos][f];

    i64 opt1= 0, opt2= 0;

    opt1= a[f][pos]+ call(pos+1, 1-f);
    opt2= call(pos+1,f);

    return dp[pos][f]= max(opt1,opt2);
}

int main(){
    sets(dp);
    sl(n);

    fr(n) sl(a[0][i]);
    fr(n) sl(a[1][i]);

    i64 ans= max(call(0,0), call(0,1));
    outl(ans);

}