Language: C++

#include <bits/stdc++.h>
using namespace std;
 
using ll = long long;
using ld  = long double;
using pll = pair<ll, ll> ;
using pld = pair<ld, ld>;
const int INF=1e9+7;
const ll LINF=1LL<<60;
const ll MOD=1e9+7;
const ld PI=acos(-1);
const ld EPS = 1e-9; //微調整用（EPSより小さいと0と判定など）

//MODINT
//変数名.nでint型の数値を受け取る
struct mint {
    int n;
    mint(int n_ = 0) : n(n_) {}
};
 
mint operator+(mint a, mint b) { a.n += b.n; if (a.n >= MOD) a.n -= MOD; return a; }
mint operator-(mint a, mint b) { a.n -= b.n; if (a.n < 0) a.n += MOD; return a; }
mint operator*(mint a, mint b) { return (long long)a.n * b.n % MOD; }
mint &operator+=(mint &a, mint b) { return a = a + b; }
mint &operator-=(mint &a, mint b) { return a = a - b; }
mint &operator*=(mint &a, mint b) { return a = a * b; }

int ii() { int x; scanf("%d", &x); return x; }
long long il() { long long x; scanf("%lld", &x); return x; }
string is() { string x; cin >> x; return x; }
char ic() { char x; cin >> x; return x; }
void oi(int x) { printf("%d ", x); }
void ol(long long x) { printf("%lld ", x); }
void od(double x) { printf("%.15f ", x); }
void os(const string &s) { printf("%s ", s.c_str()); }
auto op = [&](auto p) -> void{ cout << p; };
auto ov = [&](auto vec) -> void{ cout << vec; };
void br() { putchar('\n'); }
 
#define gcd __gcd //llは受け取ってくれない
int lcm(int a, int b){return a / gcd(a, b) * b;}
#define ALL(a) a.begin(),a.end() //sort(ALL(vec));
#define REP(i,m,n) for(int i=(int)(m) ; i < (int) (n) ; ++i )
#define rep(i,n) REP(i,0,n)
#define MP(a,b) make_pair(a,b)
#define SORT_UNIQUE(c) (sort(c.begin(),c.end()), c.resize(distance(c.begin(),unique(c.begin(),c.end()))))
#define GET_POS(c,x) (lower_bound(c.begin(),c.end(),x)-c.begin())
#define PB push_back
#define SZ(x) ((int)(x).size) //size()がunsignedなのでエラー避けに

// coutによるpairの出力（空白区切り）
template<typename T1, typename T2> ostream& operator<<(ostream& s, const pair<T1, T2>& p) {return s << p.first << " " << p.second;}
// coutによるvectorの出力（空白区切り）
template<typename T> ostream& operator<<(ostream& s, const vector<T>& v) {
	int len = v.size();
	for (int i = 0; i < len; ++i) {
		s << v[i]; if (i < len - 1) s << " "; //"\t"に変えるとTabで見やすく区切る
	}
	return s;
}
// coutによる多次元vectorの出力（空白区切り）
template<typename T> ostream& operator<<(ostream& s, const vector< vector<T> >& vv) {
	int len = vv.size();
	for (int i = 0; i < len; ++i) {
		s << vv[i] << endl;
	}
	return s;
}

//最大値、最小値を更新する。aよりbのが大きい（小さい）か等しければaを更新してtrueを返す。そうでなければ何もせずfalseを返す chmax(nowmax,x);
template<typename T>
bool chmax(T& a, T b){return (a = max(a, b)) == b;}
template<typename T>
bool chmin(T& a, T b){return (a = min(a, b)) == b;}

// ----- template end ---- //
 
// ------- library ------- //



// ----- library end ----- //



int main() {

  ll N,K;
  N = il(); K = il();
  vector<ll> vals(N);
  rep(i, N) vals[i] = il();

  ll nowsum = 0;
  ll ans = LINF;
  rep(i, N-K+1){
    chmin(ans, max(val[i+K-1], 0) - min(val[i], 0) );
  }


  ol(ans); br();

  
// -- main() end -- //
}


Compiler output:
a.cc:36:12: error: non-local lambda expression cannot have a capture-default
   36 | auto op = [&](auto p) -> void{ cout << p; };
      |            ^
a.cc:37:12: error: non-local lambda expression cannot have a capture-default
   37 | auto ov = [&](auto vec) -> void{ cout << vec; };
      |            ^
a.cc: In function 'int main()':
a.cc:96:20: error: 'val' was not declared in this scope; did you mean 'vals'?
   96 |     chmin(ans, max(val[i+K-1], 0) - min(val[i], 0) );
      |                    ^~~
      |                    vals