#include "boxes.h"
#include <iostream>
#include <cmath>
#include <algorithm>
#include <map>
#include <unordered_map>
#include <vector>
#include <iomanip>
#include <string>
#include <queue>
#include <set>
#include <deque>
using namespace std;
// static char _buffer[1024];
// static int _currentChar = 0;
// static int _charsNumber = 0;
// static FILE *_inputFile, *_outputFile;
// static inline int _read() {
// if (_charsNumber < 0) {
// exit(1);
// }
// if (!_charsNumber || _currentChar == _charsNumber) {
// _charsNumber = (int)fread(_buffer, sizeof(_buffer[0]), sizeof(_buffer), _inputFile);
// _currentChar = 0;
// }
// if (_charsNumber <= 0) {
// return -1;
// }
// return _buffer[_currentChar++];
// }
// static inline int _readInt() {
// int c, x, s;
// c = _read();
// while (c <= 32) c = _read();
// x = 0;
// s = 1;
// if (c == '-') {
// s = -1;
// c = _read();
// }
// while (c > 32) {
// x *= 10;
// x += c - '0';
// c = _read();
// }
// if (s < 0) x = -x;
// return x;
// }
int n,k,l;
int dis(int x){
return min(x,l-x);
}
long long delivery(int N,int K,int L, int b[]){
n=N,k=K,l=L;
deque<int>a;
for (int i=0;i<n;i++){
a.push_back(b[i]);
}
int c=0;
k--;
while (a.size()){
int p;
if (dis(a.front())<=dis(a.back())){
p=a.front();
a.pop_front();
c+=dis(p);
for (int i=0;i<k;i++){
if (!a.size())break;
if (dis(a.front())+dis(p)<=abs(p-a.front())){
break;
}
c+=abs(p-a.front());
p=a.front();
a.pop_front();
}
c+=dis(p);
}
else{
p=a.back();
a.pop_back();
c+=dis(p);
for (int i=0;i<k;i++){
if (!a.size())break;
if (dis(a.back())+dis(p)<=abs(p-a.back())){
break;
}
c+=abs(p-a.back());
p=a.back();
a.pop_back();
}
c+=dis(p);
}
}
return c;
}
// int main() {
// _inputFile = fopen("input.txt", "rb");
// _outputFile = fopen("output.txt", "w");
// int N, K, L, i;
// N = _readInt();
// K = _readInt();
// L = _readInt();
// int *p = (int*)malloc(sizeof(int) * (unsigned int)N);
// for (i = 0; i < N; i++) {
// p[i] = _readInt();
// }
// fprintf(_outputFile, "%lld\n", delivery(N, K, L, p));
// return 0;
// }
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