Go: ///
// File:  0579.go
// Author: ymiyamoto
//
// Created on Mon Mar 19 18:46:50 2018
//
package main

import (
	"fmt"
)

var D, N int

type cloth struct {
	A, B, C int
}

func abs(a int) int {
	if a > 0 {
		return a
	}
	return -a
}

func max(a, b int) int {
	if a < b {
		return b
	}
	return a
}

func main() {
	fmt.Scan(&D, &N)
	thermals := make([]int, D+1)

	for i := 1; i <= D; i++ {
		fmt.Scan(&thermals[i])
	}

	clothes := make([]cloth, N)
	for i := 0; i < N; i++ {
		fmt.Scan(&clothes[i].A, &clothes[i].B, &clothes[i].C)
	}

	dp := make([][]int, D+1)
	for i := range dp {
		dp[i] = make([]int, N)
	}

	for i := 1; i < D; i++ {
		for j := 0; j < N; j++ {
			for k := 0; k < N; k++ {
				t1 := thermals[i]
				t2 := thermals[i+1]
				if clothes[j].A <= t2 && t2 <= clothes[j].B && clothes[k].A <= t1 && t1 <= clothes[k].B {
					dp[i+1][j] = max(dp[i+1][j], dp[i][k]+abs(clothes[j].C-clothes[k].C))
				}
			}
		}
	}

	val := 0
	for _, v := range dp[D] {
		val = max(val, v)
	}

	fmt.Println(val)
}

C++: #include<bits/stdc++.h>
using namespace std;
using ll = long long;
using VI = vector<ll>;
using VV = vector<VI>;
using VS = vector<string>;

// tourist set
template <typename A, typename B>
string to_string(pair<A, B> p);

template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p);

template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p);

string to_string(const string& s) {
  return '"' + s + '"';
}

string to_string(const char* s) {
  return to_string((string) s);
}

string to_string(bool b) {
  return (b ? "true" : "false");
}

string to_string(vector<bool> v) {
  bool first = true;
  string res = "{";
  for (int i = 0; i < static_cast<int>(v.size()); i++) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(v[i]);
  }
  res += "}";
  return res;
}

template <size_t N>
string to_string(bitset<N> v) {
  string res = "";
  for (size_t i = 0; i < N; i++) {
    res += static_cast<char>('0' + v[i]);
  }
  return res;
}

template <typename A>
string to_string(A v) {
  bool first = true;
  string res = "{";
  for (const auto &x : v) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(x);
  }
  res += "}";
  return res;
}

template <typename A, typename B>
string to_string(pair<A, B> p) {
  return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}

template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p) {
  return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ")";
}

template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p) {
  return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ", " + to_string(get<3>(p)) + ")";
}

void debug_out() { cerr << '\n'; }

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << to_string(H);
  debug_out(T...);
}

#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif
// tourist set end

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define rep(i,b) FOR(i, 0, b)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<'\n'
#define p2(s, t) cout << (s) << " " << (t) << '\n'
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << '\n'
#define p_yes() p("YES")
#define p_no() p("NO")
#define SZ(x) ((int)(x).size())
#define SORT(A) sort(ALL(A))
#define RSORT(A) sort(ALL(A), greater<ll>())

void no(){p_no(); exit(0);}
void yes(){p_yes(); exit(0);}

const ll mod = 1e9 + 7;
const ll inf = 1e18;
const double PI = acos(-1);

// i : day
// j : last outfit
ll dp[250][250];

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    ll D, N; 
    cin >> D >> N;

    // temperature
    VI T(D);
    rep(i, D){
      cin >> T.at(i);
    }

    VI A(N);
    VI B(N);
    VI C(N);
    rep(i, N){
      cin >> A[i] >> B[i] >> C[i];
    }

    // 1日目、着れない服がある
    rep(i, N){
      if(A[i]<=T[0] && T[0]<=B[i]){
        dp[0][i] = 0;
      }else{
        dp[0][i] = -inf;
      }
    }

    FOR(d, 1, D){
      rep(i, N){ // 前日に着た服
        rep(j, N){ // 今日着る服
          if(A[j]<=T[d] && T[d]<=B[j]){
            ll diff = abs(C[i]-C[j]);
            chmax(dp[d][j], dp[d-1][i] + diff);
          }else{
            dp[d][j] = -inf;
          }
        }
      }
    }
    ll ma = 0;
    rep(i, N){
      chmax(ma, dp[D-1][i]);
    }
    p(ma);
    
    return 0;
}

C++: #include<bits/stdc++.h>
#define LL long long
#define FOR(i,a,b) for(int i=a;i<=b;++i)

using namespace std;

static const LL MAX_N = 1e+5;
static const LL INF = 1 << 25;

struct clothes{
    LL A[100],B[100],C[150];
};

int N,D;
LL res=-INF;
LL Day[300];
LL mem[300][100][100];
clothes T;

LL cal(LL day,LL p,LL pp,LL sum){
    //cout<<sum+abs(pp-p)<<" "<<day<<" "<<mem[day][p][pp]<<endl;
    if(mem[day][p][pp]!=0)res=mem[day][p][pp];
    //else{
        if(res<sum+abs(pp-p)&&day==N+1)mem[day][p][pp]=res=sum+abs(pp-p);
        if(day==N+1)return 0;
        if(day==0){
            FOR(i,1,D)
            if(Day[1]>=T.A[i]&&Day[1]<=T.B[i])res=cal(day+1,T.C[i],p,sum);
        }
        FOR(i,1,D){
            if(Day[day]>=T.A[i]&&Day[day]<=T.B[i]){
                if(day>2)cal(day+1,T.C[i],p,sum+abs(pp-p));
                else cal(day+1,T.C[i],p,sum);
            }
        }
   // }
    return res;
}


int main(){
    cin>>N>>D;
    FOR(i,1,N)cin>>Day[i];
    FOR(i,1,D)
        cin>>T.A[i]>>T.B[i]>>T.C[i];
    cout<<cal(0,0,0,0)<<endl;
}

C++: #include<iostream>

using namespace std;

int main(){

    int d, n;
    cin>> d>> n;
    int T[d+1];
    for(int i=1; i<=d; i++){
        cin>> T[i];
    }
    int A[n+1], B[n+1], C[n+1];
    for(int i=1; i<=n; i++){
        cin>> A[i]>> B[i]>> C[i];
    }

    int dp[d+1][n+1];
    fill(dp[0], dp[d+1], -1);
    for(int i=1; i<n+1; i++){
        if(A[i]<=T[1]&&T[1]<=B[i]){
            dp[1][i]=0;
        }
    }

    for(int day=1; day<=d; day++){
        for(int pre=1; pre<=n; pre++){
            for(int now=1; now<=n; now++){
                if(A[now]<=T[day]&&T[day]<=B[now]&&dp[day-1][pre]!=-1)
                    dp[day][now]=max(dp[day][now], dp[day-1][pre]+abs(C[now]-C[pre]));
            }
        }
    }

    int ans=-1;
    for(int i=1; i<=n; i++){
        ans=max(ans, dp[d][i]);
    }

    cout<< ans<< endl;
    
    return 0;
}