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Submission #575225

# Submission time Handle Problem Language Result Execution time Memory
575225 2022-06-10T03:09:42 Z 8e7 Uplifting Excursion (BOI22_vault) C++17
0 / 100
 34 ms 8320 KB 
//Challenge: Accepted
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
using namespace std;
#ifdef zisk
void debug(){cout << endl;}
template<class T, class ... U> void debug(T a, U ... b){cout << a << " ", debug(b...);}
template<class T> void pary(T l, T r) {
	while (l != r) cout << *l << " ", l++;
	cout << endl;
}
#else
#define debug(...) 0
#define pary(...) 0
#endif
#define ll long long
#define maxn 1000005
#define pii pair<int, int>
#define ff first
#define ss second
#define io ios_base::sync_with_stdio(0);cin.tie(0);
const int inf = 1<<30;
int dp[maxn];
int main() {
	io
	int m;
	ll L;
	cin >> m >> L;
	vector<ll> a(2*m+1), ex(2*m+1), ex2(2*m+1);	
	ll mins = -maxn / 2, ans = 0;
	ll sum = 0;
	for (int i = 0;i < 2*m+1;i++) {
		cin >> a[i];
		if (i == m) ans += a[i], a[i] = 0;
		sum += a[i] * (i - m);	
	}
	if (sum < L) {
		for (int i = 0;i < m;i++) swap(a[i], a[2*m - i]);
		L = -L;
	}
	for (int i = 0;i < m;i++) {
		L -= a[i] * (i - m);
		ans += a[i];
		
		ex2[2 * m - i] = min(a[i],(ll)(1LL<<60));

		a[i] = 0;
	}
	for (int i = m+1;i < 2*m+1;i++) {
		ll p = min(a[i], L / (i-m));
		ans += p;
		L -= p * (i-m);
		a[i] -= p;

		ex[i] = min(a[i], (ll)(1LL<<60));
		ex[2 * m - i] = min(p,(ll)(1LL<<60));
	}
	for (int i = 0;i < maxn;i++) dp[i] = -inf;	
	assert(0 <= L && L <= m);

	dp[-mins] = 0;
	for (int i = 0;i < 2*m+1;i++) {
		ll cnt = 1;
		vector<int> num;
		while (ex[i] >= cnt) {
			num.push_back(cnt);
			ex[i] -= cnt;
			cnt <<= 1;
		}
		if (ex[i] > 0) num.push_back(ex[i]);
		for (int p:num) {
			if (i - m > 0) {
				for (int j = maxn - 1;j >= 0;j--) {
					int val = j + p * (i-m);
					if (val >= maxn) continue;
					int del = i < m ? -p : p;
					dp[val] = max(dp[val], dp[j] + del);
				}
			} else {
				for (int j = 0;j < maxn;j++) {
					int val = j + p * (i-m);
					if (val < 0) continue;
					int del = i < m ? -p : p;
					dp[val] = max(dp[val], dp[j] + del);
				}
			}
		}
	}
	ex = ex2;
	for (int i = m+1;i < 2*m+1;i++) {
		ll cnt = 1;
		vector<int> num;
		while (ex[i] >= cnt) {
			num.push_back(cnt);
			ex[i] -= cnt;
			cnt <<= 1;
		}
		if (ex[i] > 0) num.push_back(ex[i]);
		for (int p:num) {
			for (int j = maxn - 1;j >= 0;j--) {
				int val = j + p * (i-m);
				if (val >= maxn) continue;
				dp[val] = max(dp[val], dp[j] - p);
			}
		}
	}
	if (L - mins >= maxn || L - mins < 0 || dp[L - mins] < -maxn) cout << "impossible\n";
	else cout << dp[L - mins]+ans << "\n";
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 4224 KB Output is correct
2 Correct 7 ms 4180 KB Output is correct
3 Correct 5 ms 4136 KB Output is correct
4 Correct 29 ms 4180 KB Output is correct
5 Runtime error 33 ms 8268 KB Execution killed with signal 11
6 Halted 0 ms 0 KB -

Subtask #2
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 4224 KB Output is correct
2 Correct 7 ms 4180 KB Output is correct
3 Correct 5 ms 4136 KB Output is correct
4 Correct 29 ms 4180 KB Output is correct
5 Runtime error 33 ms 8268 KB Execution killed with signal 11
6 Halted 0 ms 0 KB -

Subtask #3-1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 28 ms 4180 KB Output is correct
2 Runtime error 34 ms 8320 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #3-2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 28 ms 4180 KB Output is correct
2 Runtime error 34 ms 8320 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #4-1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 28 ms 4180 KB Output is correct
2 Runtime error 34 ms 8320 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #4-2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 4224 KB Output is correct
2 Correct 7 ms 4180 KB Output is correct
3 Correct 5 ms 4136 KB Output is correct
4 Correct 29 ms 4180 KB Output is correct
5 Runtime error 33 ms 8268 KB Execution killed with signal 11
6 Halted 0 ms 0 KB -

Subtask #5-1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 28 ms 4180 KB Output is correct
2 Runtime error 34 ms 8320 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #5-2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 4224 KB Output is correct
2 Correct 7 ms 4180 KB Output is correct
3 Correct 5 ms 4136 KB Output is correct
4 Correct 29 ms 4180 KB Output is correct
5 Runtime error 33 ms 8268 KB Execution killed with signal 11
6 Halted 0 ms 0 KB -

Subtask #6-1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 28 ms 4180 KB Output is correct
2 Runtime error 34 ms 8320 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #6-2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 4224 KB Output is correct
2 Correct 7 ms 4180 KB Output is correct
3 Correct 5 ms 4136 KB Output is correct
4 Correct 29 ms 4180 KB Output is correct
5 Runtime error 33 ms 8268 KB Execution killed with signal 11
6 Halted 0 ms 0 KB -