#include <bits/stdc++.h>
using namespace std;
const int MAXN = 2e7 + 10;
//int n, k, l, vet[MAXN];
typedef long long ll;
long long delivery(long long N, long long K, long long L, int positions[MAXN]){
long long x = N, sum=0;
long long ini=0, fim=N-1;
for(long long i=x; i>1; i-=2){
if(ini+(K-1)<=N-1 and fim-(K-1)>=0 and (2*((ll)positions[ini+(K-1)]))<(2*(L-(ll)positions[fim-(K-1)]))){
sum+=(long long)2*(long long)(positions[ini+(K-1)]);
ini+=K;
}
else if (2*(L-(ll)positions[fim-(K-1)]) < L){
sum+=2*(L-(ll)positions[fim-(K-1)]);
fim-=K;
}
else{
sum+=L;
ini+=K;
}
}
sum+=(long long)min(2*(ll)positions[ini], 2*(ll)(L-positions[fim]));
return sum;
}
/*
int main(){
cin >> n >> k >> l;
for(int i=0; i<n; i++){
cin >> vet[i];
}
cout << delivery(n, k, l, vet) << endl;
}
*/
Compilation message
/tmp/ccrE6yHh.o: In function `main':
grader.c:(.text.startup+0x22f): undefined reference to `delivery(int, int, int, int*)'
collect2: error: ld returned 1 exit status
