Submission #484736

#	Time	Username	Problem	Language	Result	Execution time	Memory
484736		imachug	Boxes with souvenirs (IOI15_boxes)	C++17	50 / 100	2087 ms	29476 KiB

boxes

#include "boxes.h"

#include <bits/stdc++.h>

using namespace std;


long long delivery(int n, int k, int l, int p[]) {
	vector<long long> dp_left(n + 1, 1e18);
	dp_left[0] = 0;
	for(int i = 1; i <= n; i++) {
		dp_left[i] = dp_left[max(0, i - k)] + 2 * p[i - 1];
	}

	vector<long long> dp_right(n + 1, 1e18);
	dp_right[n] = 0;
	for(int i = n - 1; i >= 0; i--) {
		dp_right[i] = dp_right[min(n, i + k)] + 2 * (l - p[i]);
	}

	long long ans = 1e18;
	for(int i = 0; i <= n; i++) {
		for(int j = i; j <= n; j++) {
			ans = min(ans, dp_left[i] + dp_right[j] + (long long)(j - i + k - 1) / k * l);
		}
	}

	return ans;


	if(k == 1) {
		long long ans = 0;
		for(int i = 0; i < n; i++) {
			ans += min(p[i] * 2, (l - p[i]) * 2);
		}
		return ans;
	}

	if(k == n) {
		long long ans = l;
		for(int i = -1; i < n; i++) {
			ans = min(ans, (long long)(i == -1 ? 0 : p[i] * 2) + (long long)(i == n - 1 ? 0 : (l - p[i + 1]) * 2));
		}
		return ans;
	}

	return 0;
}

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:32:13: warning: declaration of 'ans' shadows a previous local [-Wshadow]
   32 |   long long ans = 0;
      |             ^~~
boxes.cpp:21:12: note: shadowed declaration is here
   21 |  long long ans = 1e18;
      |            ^~~
boxes.cpp:40:13: warning: declaration of 'ans' shadows a previous local [-Wshadow]
   40 |   long long ans = l;
      |             ^~~
boxes.cpp:21:12: note: shadowed declaration is here
   21 |  long long ans = 1e18;
      |            ^~~

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