Submission #169388

#	Time	Username	Problem	Language	Result	Execution time	Memory
169388		ruler	Kitchen (BOI19_kitchen)	C++14	100 / 100	66 ms	1152 KiB

kitchen

// IOI 2021
#include <bits/stdc++.h>
using namespace std;

#define endl '\n'
#define ends ' '
#define die(x) return cout << x << endl, 0
#define all(v) v.begin(), v.end()
#define sz(x) (int)(x.size())
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) { cerr << ends << H; debug_out(T...); }
#define debug(...) cerr << "{" << #__VA_ARGS__ << "}:", debug_out(__VA_ARGS__)
typedef long long ll;
typedef pair<int, int> pii;
const ll INF = 1e9;
const ll MOD = 1e9 + 7;

////////////////////////////////////////////////////////////////////

const int N = 3e2 + 5;

int B[N], DP[2][N * N];

int main() {

	ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	
	int n, m, k, sum = 0; cin >> n >> m >> k;
	if (m < k) die("Impossible");
	for (int i = 0; i < n; i++) {
		int a; cin >> a;
		sum += a;
		if (a < k) die("Impossible");
	}
	for (int i = 1; i <= m; i++) for (int j = 0; j < N * N; j++) DP[i & 1][j] = -INF;
	DP[0][0] = 0;
	for (int i = 1; i <= m; i++) cin >> B[i];
	for (int i = 1; i <= m; i++) for (int j = 0; j < N * N; j++) {
		DP[i & 1][j] = DP[(i - 1) & 1][j];
		if (j >= B[i]) DP[i & 1][j] = max(DP[i & 1][j], DP[(i - 1) & 1][j - B[i]] + min(B[i], n));
	}
	for (int i = 0; i + sum < N * N; i++) if (DP[m & 1][i + sum] >= n * k) die(i);
	cout << "Impossible" << endl;

	return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 22 / 22
• Subtask 3: 20 / 20
• Subtask 4: 21 / 21
• Subtask 5: 28 / 28