Submission #154129

#	Time	Username	Problem	Language	Result	Execution time	Memory
154129		arnold518	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	616 ms	241812 KiB

boxes

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

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 2e7;

int N, K, L, P[MAXN+10];
ll A[MAXN+10], B[MAXN+10], ans=1e18;

ll delivery(int _N, int _K, int _L, int *_P)
{
    int i, j;
    N=_N; K=_K; L=_L;
    for(i=1; i<=N; i++) P[i]=_P[i-1]+1;

    for(i=1; i<=N; i++) A[i]=A[max(0, i-K)]+P[i]-1+min(P[i]-1, L-P[i]+1);
    for(i=N; i>=1; i--) B[i]=B[min(N+1, i+K)]+L-P[i]+1+min(P[i]-1, L-P[i]+1);

    ans=min(A[N], B[1]);
    for(i=1; i<N; i++) ans=min(ans, A[i]+B[i+1]);
    return ans;
}

Compilation message (stderr)

boxes.cpp: In function 'll delivery(int, int, int, int*)':
boxes.cpp:16:12: warning: unused variable 'j' [-Wunused-variable]
     int i, j;
            ^

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