Submission #1326255

#	Time	Username	Problem	Language	Result	Execution time	Memory
1326255		ppmn_6	Boxes with souvenirs (IOI15_boxes)	C++20	0 / 100	1 ms	332 KiB

boxes

#include "bits/stdc++.h"
#include "boxes.h"
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
 
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
 
// https://codeforces.com/blog/entry/79148
class Timer: chrono::high_resolution_clock {
    const time_point start_time;
public:
    Timer(): start_time(now()) {}
    rep elapsed_time() const {
		return chrono::duration_cast<chrono::milliseconds>(now() - start_time).count();
	}
} timer;

ll delivery(int n, int k, int l, int v[]) {
	vector<ll> dp(n, 1e18);
	auto dist = [&] (ll x, ll y) {
		if (x > y) {
			swap(x, y);
		}
		return min(y - x, l - y + x);
	};
	auto trip = [&] (int lb, int rb) {
		ll cur;
		if (((l & 1) && v[lb] <= l / 2 && v[rb] > l / 2) || (!(l & 1) && v[lb] < l / 2 && v[rb] > l / 2)) {
			cur = l;
		}
		else {
			cur = min(ll(l), 2 * max(dist(0, v[lb]), dist(0, v[rb])));
		}
		if (!lb) {
			dp[rb] = min(dp[rb], cur);
		}
		else {
			dp[rb] = min(dp[rb], dp[lb - 1] + cur);
		}
	};
	int nxt = n;
	for (int i = 0; i < n - 1; i++) {
		if (v[i + 1] - v[i] > l / 2) {
			nxt = i + 1;
			break;
		}
	}
	for (int i = 0; i < nxt % k; i++) {
		trip(0, i);
	}
	for (int i = nxt % k; i < nxt; i++) {
		if (i >= k - 1) {
			trip(i - k + 1, i);
		}
		trip(i - (nxt % k) + 1, i);
	}
	for (int i = nxt; i < nxt + ((n - nxt) % k); i++) {
		trip(nxt, i);
	}
	for (int i = nxt + ((n - nxt) % k); i < n; i++) {
		if (i - k + 1 >= nxt) {
			trip(i - k + 1, i);
		}
		trip(i - ((n - nxt) % k) + 1, i);
	}
	if (nxt != n) {
		return dp[n - 1] + dp[nxt - 1];
	}
	return dp[n - 1];
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30