Submission #420298

#	Time	Username	Problem	Language	Result	Execution time	Memory
420298		Azimjon	Boxes with souvenirs (IOI15_boxes)	C++17	20 / 100	1 ms	296 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>

using namespace std;

const int INF = 2e9;

long long delivery(int n, int k, int L, int p[]) {
	long long ans = 0;
	double ur = L / 2;

	int l, r;
	l = 0;
	r = n - 1;

	while (l + k - 1 < n && p[l + k - 1] <= ur) {
		ans += 2 * p[l + k - 1];
		l += k;
	}
	// cerr << ans << endl;
	while (r - k + 1 >= 0 && p[r - k + 1] > (ur)) {
		ans += 2 * (L - p[r - k + 1]);
		r -= k;
	}

	int i;
	for (i = l; i <= r; i++) {
		if (p[i] > ur) break;
	}

	long long qo = 0;
	if (l <= i - 1) qo += 2 * p[i - 1];
	if (i <= r) qo += 2 * (L - p[i]);

	int qs = (r - l + 1);

	if (qs <= 0) return ans;

	if (qs > k) {
		int t = qs - i;

		long long al = min(2 * p[l + t - 1] + L, 2 * p[r - t + 1] + L);
		qo = min(al, qo);
	} else {
		qo = min(qo, (long long)L);
	}
	cerr << ans << endl;
	return ans + qo;
}

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