oj.uz

Submission #365344

# Submission time Handle Problem Language Result Execution time Memory
365344 2021-02-11T13:48:39 Z kostia244 Homecoming (BOI18_homecoming) C++17
0 / 100
 44 ms 12268 KB 
#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx,avx2,sse,sse2")
#include<bits/stdc++.h>
#include"homecoming.h"
#define all(x) begin(x), end(x)
using namespace std;
using ll = long long;
int n, k;
vector<ll> a, b;
vector<int> tooka, tookb;
struct seg {
	int n;
	vector<ll> tree;
	seg(int n) {
		n = a.size();
		while(n & (n-1)) n += n&-n;
		tree.resize(2*n, 1ll<<60);
	}
	template<int SET>
	void upd(int pos, ll val) {
		for(SET ? (tree[pos+=n]=val) : (tree[pos+=n]+=val); pos/=2;)
			tree[pos] = min(tree[2*pos], tree[2*pos+1]);
	}
	ll query() { return tree[1]; }
	ll query(int l, int r) {
		ll res = 0;
		for(l += n, r += n; l < r; l>>=1,r>>=1) {
			if(l&1) res = min(res, tree[l++]);
			if(r&1) res = min(res, tree[--r]);
		}
		return res;
	}
};
//ll get(const vector<ll> &a, int l, int r) {
//	return a[r] - (l?a[l-1]:0);
//}
ll naive1(int fil) {
	deque<ll> dp;
	const ll inf = 1ll<<50;
	for(int i = 0; i <= k; i++)
		dp.push_back(i == fil ? 0 : -inf);
	ll best = 0, lazyadd = 0;
	for(int i = 0; i < n; i++) {
		ll bk = dp.back();
		dp.push_front(best-lazyadd);
		dp.pop_back();
		dp.back() = max(dp.back(), bk);
		lazyadd += b[i];
		dp.back() += a[i];
		best = max(dp.back()+lazyadd, best);
	}
	return best;
}
long long solve(int N, int K, int *A, int *B) {
	n = N, k = K;
	a = vector<ll>(A, A+n);
	b = vector<ll>(B, B+n);
	for(auto &i : b) i *= -1;
	//for(int i = 1; i < n; i++)
	//	a[i] += a[i-1], b[i] += b[i-1];
	ll ans = 0;
	//for(auto i : a) cout << i << " "; cout << endl;
	//for(auto i : b) cout << i << " "; cout << endl;
	for(int i = 0; i < k; i++) ans = max(ans, naive1(i));
	return ans;
}

Subtask #1
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Incorrect 2 ms 364 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Incorrect 2 ms 364 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 31.0

# Verdict Execution time Memory Grader output
1 Incorrect 44 ms 12268 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Incorrect 2 ms 364 KB Output isn't correct
3 Halted 0 ms 0 KB -