Submission #219795

#	Time	Username	Problem	Language	Result	Execution time	Memory
219795		Nightlight	Boxes with souvenirs (IOI15_boxes)	C++14	10 / 100	5 ms	384 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;

long long dpL[10000005], dpR[10000005];

long long delivery(int N, int K, int L, int p[]) {
  for(int i = 1; i <= N; i++) {
    dpL[i] = ((long long) p[i - 1]) << 1LL;
    if(i > K) dpL[i] += dpL[i - K];
  }
  for(int i = N; i > 0; i--) {
    dpR[i] = ((long long) L - p[i - 1]) << 1LL;
    if(N - i > K) dpR[i] += dpR[i + K]; 
  }
  long long ans = 1e18;
  for(int i = 0; i <= N; i++) {
    ans = min(ans, dpL[i] + dpR[i + 1]);
  }
  long long res;
  for(long long j = 1; j <= N / K; j++) {
    res = 1e18;
    for(int i = 1; i + K * j <= N + 1; i++) {
      res = min(res, dpL[i - 1] + dpR[i + K * j] + j * L);
    }
    if(res >= ans) res = res;
    else ans = res;
  }
  return ans;
}

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