#include <bits/stdc++.h>
using namespace std;
#define fo(i,s,t) for(int i = s; i <= t; ++ i)
#define fd(i,s,t) for(int i = s; i >= t; -- i)
#define bf(i,s) for(int i = head[s]; i; i = e[i].next)
#define mp make_pair
#define fi first
#define se second
#define pii pair<int,int>
#define pb push_back
#define VI vector<int>
#define sf scanf
#define pf printf
#define fp freopen
#define SZ(x) ((int)(x).size())
#ifdef MPS
#define D(x...) printf(x)
#else
#define D(x...)
#endif
typedef long long ll;
typedef double db;
typedef unsigned long long ull;
const int inf = 1<<30;
const ll INF = 1ll<<60;
const db Inf = 1e20;
const db eps = 1e-9;
void gmax(int &a,int b){a = (a > b ? a : b);}
void gmin(int &a,int b){a = (a < b ? a : b);}
const int maxn = 10000050;
int n, K, L, pos[maxn];
ll wl[maxn], wr[maxn], ans;
int main()
{
#ifdef MPS
fp("1.in","r",stdin);
fp("1.out","w",stdout);
#endif
sf("%d%d%d",&n,&K,&L);
fo(i,1,n) sf("%d",&pos[i]);
fo(i,1,n) wl[i] = wl[max(0,i-K)] + pos[i]*2;
fd(i,n,1) wr[i] = wr[min(n+1,i+K)] + (L-pos[i])*2;
ans = INF;
fo(i,0,n) ans = min(ans, wl[i] + wr[i+1]);
fo(i,0,n-K) ans = min(ans, wl[i] + wr[i+K+1] + L);
cout << ans << endl;
return 0;
}
Compilation message
boxes.cpp: In function 'int main()':
boxes.cpp:44:4: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
sf("%d%d%d",&n,&K,&L);
^
boxes.cpp:45:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
fo(i,1,n) sf("%d",&pos[i]);
^
/tmp/cc9Kw55s.o: In function `main':
grader.c:(.text.startup+0x0): multiple definition of `main'
/tmp/cc8JHgF7.o:boxes.cpp:(.text.startup+0x0): first defined here
/tmp/cc9Kw55s.o: In function `main':
grader.c:(.text.startup+0x22f): undefined reference to `delivery(int, int, int, int*)'
collect2: error: ld returned 1 exit status
