Submission #164196

#	Time	Username	Problem	Language	Result	Execution time	Memory
164196		dantoh000	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	655 ms	271076 KiB

boxes

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#include "boxes.h"
long long delivery(int N, int K, int L, int p[]) {
    ll l[N+2], r[N+2];
    r[N+1] = 0;
    l[0] = 0;
    ll cost = 0;
    for (int i = 1; i <= N; i++){
        l[i] = p[i-1]*2;
        if (i >= K){
            l[i] += l[i-K];
        }
    }
    cost = 0;
    for (int i = N; i >= 1; i--){
        r[i] = (L-p[i-1])*2;
        if ((N-i+1) >= K){
            r[i] += r[i+K];
        }
    }
    l[N+1] = l[N];
    r[0] = r[1];
    ll ans = min(l[N+1],r[0]);
    for (int i = 1; i+K-1 <= N; i++){
        //printf("%lld %lld +\n",l[i-1],r[i+K]);
        ans = min(ans,l[i-1]+r[i+K]+L);
    }
    for (int i = 0; i <= N; i++){
        //printf("%d %lld %lld\n",i,l[i],r[i+1]);
        ans = min(ans,l[i]+r[i+1]);
    }
    return ans;
}

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:9:8: warning: variable 'cost' set but not used [-Wunused-but-set-variable]
     ll cost = 0;
        ^~~~

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