Submission #81679

#	Time	Username	Problem	Language	Result	Execution time	Memory
81679		wzy	Boxes with souvenirs (IOI15_boxes)	C++11	0 / 100	8 ms	376 KiB

boxes

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

long long dpL[10000001] , dpR[10000001]; 

long long delivery(int N, int K, int L, int p[]) {
	#define int long long 
	int ans = (int) 1e18;
	int k = K;
	int n = N;
	int l = L;
	for(int i = 0 ; i < N ;i ++){
		dpL[i] = 2*p[i];
		if(i >= K) dpL[i] = dpL[i-k] + 2*p[i]; // pick the last block and then solve for [0 , i-k]
	}
	for(int j = N - 1 ; j >= 0 ; j--){
		int u = j + K ;
		dpR[j] = 2*(L - p[j]);
		if(u <= n - 1) dpR[j] = dpR[u] + 2*(L - p[j]); 
	}
	for(int j = N - 1 ; j >= 0 ; j--){
		for(int r = 0 ; (j - k*r + 1) >= 0 ; r++){
			int u = j - k*r + 1;
			if(u > j) continue;
			ans = min(ans ,dpL[u] + dpR[j] + L*((j-u+1)/k + ((j-u+1)%k ? 1 : 0)));
		}
		ans = min(ans , dpR[j] + L*((j)/k + (j%k ? 1 : 0)));
		int i = j;
		ans = min(ans ,dpL[j] + L *((n-i-1)/k + ((n-i-1)%k ? 1 : 0)));
	}
    return ans;
}

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:12:6: warning: unused variable 'l' [-Wunused-variable]
  int l = L;
      ^

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