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Submission #817402

# Submission time Handle Problem Language Result Execution time Memory
817402 2023-08-09T12:16:34 Z vjudge1 Feast (NOI19_feast) C++17
4 / 100
 254 ms 17344 KB 
#include <bits/stdc++.h>
using namespace std;

void main_program();

signed main(){
	ios_base::sync_with_stdio(0); cin.tie(0);
	main_program();
}

#define int long long

using ii = pair<int, int>;

int n, k;
vector<int> v, pfx;

ii better(ii a, ii b){
	if (a.first != b.first){
		return (a.first > b.first) ? a : b;
	}
	return (a.second < b.second) ? a : b;
}

ii f(int lambda){
	vector<ii> dp_closed(n), dp_open(n);
	dp_closed[0] = {0, 0};
	dp_open[0] = {max(0LL, -pfx[0]), 0};

	for (int i = 1; i < n; i++){
		dp_closed[i] = better(dp_closed[i-1],
			{dp_open[i-1].first + pfx[i] - lambda, dp_open[i-1].second + 1});
		dp_open[i] = better(dp_open[i-1],
			{dp_closed[i-1].first - pfx[i], dp_closed[i-1].second});
	}

	return dp_closed[n-1];
}

void main_program(){
	cin >> n >> k;

	v.resize(n);
	for (int i = 0; i < n; i++) cin >> v[i];
	pfx = v;
	for (int i = 1; i < n; i++) pfx[i] += pfx[i-1];

	int l = 0, r = 3e14;
	while (l < r){
		int mid = (l + r) >> 1;
		auto res = f(mid);
		if (res.second <= k) r = mid - 1;
		else l = mid + 1;
	}

	auto res = f(l);
	cout << res.first + l * res.second << "\n";
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 238 ms 16856 KB Output is correct
2 Correct 242 ms 17204 KB Output is correct
3 Correct 238 ms 17344 KB Output is correct
4 Correct 235 ms 17232 KB Output is correct
5 Correct 207 ms 17168 KB Output is correct
6 Correct 237 ms 16956 KB Output is correct
7 Correct 220 ms 16884 KB Output is correct
8 Correct 238 ms 17212 KB Output is correct
9 Correct 210 ms 16924 KB Output is correct
10 Correct 213 ms 17084 KB Output is correct

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 192 ms 15316 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 254 ms 17328 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 238 ms 16856 KB Output is correct
2 Correct 242 ms 17204 KB Output is correct
3 Correct 238 ms 17344 KB Output is correct
4 Correct 235 ms 17232 KB Output is correct
5 Correct 207 ms 17168 KB Output is correct
6 Correct 237 ms 16956 KB Output is correct
7 Correct 220 ms 16884 KB Output is correct
8 Correct 238 ms 17212 KB Output is correct
9 Correct 210 ms 16924 KB Output is correct
10 Correct 213 ms 17084 KB Output is correct
11 Incorrect 192 ms 15316 KB Output isn't correct
12 Halted 0 ms 0 KB -