Language: C++

#include <iostream>
#include <climits>
#include <algorithm>
using namespace std;

const int INF = 1<<29;
//入力
int N;
cin >> N;
vector<int> ABC; 
for (int i = 0; i < 3; i++) cin >> ABC.at(i);
vector<int> Len(8);
for (int j = 0; j < N; j++) cin >> Len.at(j);

sort(Len.begin(),Len.end());

//dpテーブル
int dp[1000][2020];

int calc_mp(N){
  //dpテーブルの初期化
  for (int i = 0; i < 1000; i++) for (int j = 0; j < 2020; j++) dp[i][j] = INF;
  for (int i = 0; i < 1000; i++) for (int k = 0; k < N; k++) dp[i][1000 + Len.at(k)] = 0;

  for (int i = 0; i < 1000; i++){
    for (int l = 0; l < 2020; l++){
      if (l != N){
        if (l >= Len.at(7)) dp[i+1][l] = min(dp[i][l-1]+1, dp[i][l+1]+1, dp[i][l-Len.at(7)+10, dp[i][l-Len.at(6)+10], dp[i][l-Len.at(5)+10, dp[i][l-Len.at(4)+10, dp[i][l-Len.at(3)+10, dp[i][l-Len.at(2)+10, dp[i][l-Len.at(1)+10, dp[i][l-Len.at(0)+10);
        else if (l >= Len.at(6) && l < Len.at(7)) dp[i+1][l] = min(dp[i][l-1]+1, dp[i][l+1]+1, dp[i][l-Len.at(6)+10], dp[i][l-Len.at(5)+10, dp[i][l-Len.at(4)+10, dp[i][l-Len.at(3)+10, dp[i][l-Len.at(2)+10, dp[i][l-Len.at(1)+10, dp[i][l-Len.at(0)+10);
        else if (l >= Len.at(5) && l < Len.at(6)) dp[i+1][l] = min(dp[i][l-1]+1, dp[i][l+1]+1, dp[i][l-Len.at(5)+10, dp[i][l-Len.at(4)+10, dp[i][l-Len.at(3)+10, dp[i][l-Len.at(2)+10, dp[i][l-Len.at(1)+10, dp[i][l-Len.at(0)+10);
        else if (l >= Len.at(4) && l < Len.at(5)) dp[i+1][l] = min(dp[i][l-1]+1, dp[i][l+1]+1, dp[i][l-Len.at(4)+10, dp[i][l-Len.at(3)+10, dp[i][l-Len.at(2)+10, dp[i][l-Len.at(1)+10, dp[i][l-Len.at(0)+10);
        else if (l >= Len.at(3) && l < Len.at(4)) dp[i+1][l] = min(dp[i][l-1]+1, dp[i][l+1]+1, dp[i][l-Len.at(3)+10, dp[i][l-Len.at(2)+10, dp[i][l-Len.at(1)+10, dp[i][l-Len.at(0)+10);
        else if (l >= Len.at(2) && l < Len.at(3)) dp[i+1][l] = min(dp[i][l-1]+1, dp[i][l+1]+1, dp[i][l-Len.at(2)+10, dp[i][l-Len.at(1)+10, dp[i][l-Len.at(0)+10);
        else if (l >= Len.at(1) && l < Len.at(2)) dp[i+1][l] = min(dp[i][l-1]+1, dp[i][l+1]+1, dp[i][l-Len.at(1)+10, dp[i][l-Len.at(0)+10);
        else if (l >= Len.at(0) && l < Len.at(1)) dp[i+1][l] = min(dp[i][l-1]+1, dp[i][l+1]+1, dp[i][l-Len.at(0)+10);
        else dp[i+1][l] = min(dp[i][l-1]+1, dp[i][l+1]+1);
      }
      else dp[i+1][l] = dp[i][l];
    }
  }
  return dp[999][N];
}

int main(){
  cout >> calc_mp(ABC.at(0)) + calc_mp(ABC.at(1)) + calc_mp(ABC.at(2)) >> endl;
}

Compiler output:
a.cc:9:1: error: 'cin' does not name a type
    9 | cin >> N;
      | ^~~
a.cc:10:1: error: 'vector' does not name a type
   10 | vector<int> ABC;
      | ^~~~~~
a.cc:11:1: error: expected unqualified-id before 'for'
   11 | for (int i = 0; i < 3; i++) cin >> ABC.at(i);
      | ^~~
a.cc:11:17: error: 'i' does not name a type
   11 | for (int i = 0; i < 3; i++) cin >> ABC.at(i);
      |                 ^
a.cc:11:24: error: 'i' does not name a type
   11 | for (int i = 0; i < 3; i++) cin >> ABC.at(i);
      |                        ^
a.cc:12:1: error: 'vector' does not name a type
   12 | vector<int> Len(8);
      | ^~~~~~
a.cc:13:1: error: expected unqualified-id before 'for'
   13 | for (int j = 0; j < N; j++) cin >> Len.at(j);
      | ^~~
a.cc:13:17: error: 'j' does not name a type
   13 | for (int j = 0; j < N; j++) cin >> Len.at(j);
      |                 ^
a.cc:13:24: error: 'j' does not name a type
   13 | for (int j = 0; j < N; j++) cin >> Len.at(j);
      |                        ^
a.cc:15:5: error: expected constructor, destructor, or type conversion before '(' token
   15 | sort(Len.begin(),Len.end());
      |     ^
a.cc:20:15: error: expected ',' or ';' before '{' token
   20 | int calc_mp(N){
      |               ^
a.cc: In function 'int main()':
a.cc:45:19: error: 'ABC' was not declared in this scope
   45 |   cout >> calc_mp(ABC.at(0)) + calc_mp(ABC.at(1)) + calc_mp(ABC.at(2)) >> endl;
      |                   ^~~
a.cc:45:28: error: 'calc_mp' cannot be used as a function
   45 |   cout >> calc_mp(ABC.at(0)) + calc_mp(ABC.at(1)) + calc_mp(ABC.at(2)) >> endl;
      |                            ^
a.cc:45:49: error: 'calc_mp' cannot be used as a function
   45 |   cout >> calc_mp(ABC.at(0)) + calc_mp(ABC.at(1)) + calc_mp(ABC.at(2)) >> endl;
      |                                                 ^
a.cc:45:70: error: 'calc_mp' cannot be used as a function
   45 |   cout >> calc_mp(ABC.at(0)) + calc_mp(ABC.at(1)) + calc_mp(ABC.at(2)) >> endl;
      |                                                                      ^