[Kick Start 2022 Round D] Maximum Gain

Maximum Gain

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#include <bits/stdc++.h>

#pragma optimization_level 3
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx")
#pragma GCC optimize("Ofast")//Comment optimisations for interactive problems (use endl)
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")

using namespace std;

struct PairHash {inline std::size_t operator()(const std::pair<int, int> &v) const { return v.first * 31 + v.second; }};

// speed
#define Code ios_base::sync_with_stdio(false);
#define By ios::sync_with_stdio(0);
#define Sumfi cout.tie(NULL);

// alias
using ll = long long;
using ld = long double;

// constants
const ld PI = 3.14159265358979323846; /* pi */
const ll INF = 1e18;
const ld EPS = 1e-9;
const ll MAX_N = 6060;
const ll mod = 998244353;

// typedef
typedef pair<ll, ll> pll;
typedef vector<pll> vpll;
typedef array<ll,3> all3;
typedef array<ll,5> all5;
typedef vector<all3> vall3;
typedef vector<all5> vall5;
typedef vector<ld> vld;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef vector<int> vi;
typedef vector<string> vs;
typedef vector<vs> vvs;
typedef unordered_set<ll> usll;
typedef unordered_set<pll, PairHash> uspll;
typedef unordered_map<ll, ll> umll;
typedef unordered_map<pll, ll, PairHash> umpll;

// macros
#define rep(i,m,n) for(ll i=m;i<n;i++)
#define rrep(i,m,n) for(ll i=n;i>=m;i--)
#define all(a) begin(a), end(a)
#define rall(a) rbegin(a), rend(a)
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
#define sz(x) ll((x).size())
#define pyes cout<<"Yes\n";
#define pno cout<<"No\n";
#define pneg1 cout<<"-1\n";
#define CASE(x) cout<<"Case #"<<x<<": ";

// utility functions
template <typename T>
void print(T &&t) { cout << t << "\n"; }
template<typename T>
void printv(vector<T>v){ll n=v.size();rep(i,0,n)cout<<v[i]<<" ";cout<<"\n";}
//void readf() {freopen("", "rt", stdin);}

ll __gcd(ll x, ll y) { return !y ? x : __gcd(y, x % y); }
ll __lcm(ll x, ll y) { return x * y / __gcd(x,y); }
ll modpow(ll n, ll x, ll MOD = mod) { if(!x) return 1; ll res = modpow(n,x>>1,MOD); res = (res * res) % MOD; if(x&1) res = (res * n) % MOD; return res; }

bool vis[MAX_N][MAX_N];

void helper(vll& A, vll& dp, ll i, ll j, ll pick, ll sum) {
if(pick >= sz(dp)) return;
if(vis[i][j]) return;
vis[i][j] = true;
dp[pick] = max(dp[pick], sum);
if(i == j) {
helper(A,dp,MAX_N-1,MAX_N-1,pick+1,sum + A[i]);
} else {
helper(A,dp,i,j-1,pick+1,sum+A[j]);
helper(A,dp,i+1,j,pick+1,sum+A[i]);
}
}

ll solve(vll& A, vll& B, ll n, ll m, ll k) {
ll res = 0;

vll dpa(min(n+1,k+1)), dpb(min(m+1,k+1));
ZERO(vis);
helper(A,dpa,0,sz(A)-1,0, 0);
ZERO(vis);
helper(B,dpb,0,sz(B)-1,0, 0);

rep(i,0,sz(dpa)) {
ll picka = i, pickb = min(k-i,sz(dpb)-1);
res = max(res, dpa[picka] + dpb[pickb]);
}
rep(i,0,sz(dpb)) {
ll pickb = i, picka = min(k-i,sz(dpa)-1);
res = max(res, dpa[picka] + dpb[pickb]);
}
return res;
}

int main() {
Code By Sumfi

cout.precision(12);

ll tc = 1;
cin>>tc;
for (ll i = 1; i <= tc; i++) {
ll n,m,k;
cin>>n;
vll A(n);
rep(i,0,n) cin>>A[i];
cin>>m;
vll B(m);
rep(i,0,m) cin>>B[i];
cin>>k;
CASE(i) print(solve(A,B,n,m,k));
}
return 0;
}
Author: Song Hayoung
Link: https://songhayoung.github.io/2022/07/10/PS/Google/maximum-gain/
Copyright Notice: All articles in this blog are licensed under CC BY-NC-SA 4.0 unless stating additionally.