結果
| 問題 | No.595 登山 | 
| コンテスト | |
| ユーザー |  | 
| 提出日時 | 2018-12-01 23:35:10 | 
| 言語 | C++11(廃止可能性あり) (gcc 13.3.0) | 
| 結果 | 
                                AC
                                 
                             | 
| 実行時間 | 29 ms / 1,500 ms | 
| コード長 | 2,626 bytes | 
| コンパイル時間 | 1,297 ms | 
| コンパイル使用メモリ | 162,968 KB | 
| 実行使用メモリ | 7,936 KB | 
| 最終ジャッジ日時 | 2024-06-27 01:38:46 | 
| 合計ジャッジ時間 | 2,915 ms | 
| ジャッジサーバーID (参考情報) | judge3 / judge4 | 
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| ファイルパターン | 結果 | 
|---|---|
| sample | AC * 4 | 
| other | AC * 25 | 
ソースコード
#include "bits/stdc++.h"
#define ALL(g) (g).begin(),(g).end()
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define RREP(i, x, n) for(int i = x; i >= n; i--)
#define rrep(i, n) RREP(i,n,0)
#define pb push_back
#pragma GCC optimize ("-O3")
using namespace std;
#define DEBUG_IS_VALID
#ifdef DEBUG_IS_VALID
#define DEB 1 
#else
#define DEB 0
#endif
#define DUMPOUT cout
#define dump(...) if(DEB) DUMPOUT<<"  "<<#__VA_ARGS__<<" :["<<__LINE__<<":"<<__FUNCTION__<<"]"<<endl<<"    "; if(DEB) dump_func(__VA_ARGS__)
template<typename T1,typename T2>ostream& operator << (ostream& os, pair<T1,T2> p){cout << "(" << p.first << ", " << p.second << ")"; return os;}
template<typename T>ostream& operator << (ostream& os, vector<T>& vec) { os << "{"; for (int i = 0; i<vec.size(); i++) os << vec[i] << (i + 1 == vec.size() ? "" : ", "); os << "}"; return os; }
template<typename T>ostream& operator << (ostream& os, set<T>& st){for(auto itr = st.begin(); itr != st.end(); itr++) cout << *itr << (next(itr)!=st.end() ? ", " : ""); cout << "}"; return os;}
template<typename T1,typename T2>ostream& operator << (ostream& os, map<T1,T2> mp){cout << "{"; for(auto itr = mp.begin(); itr != mp.end(); itr++) cout << "(" << (itr->first) << ", " << (itr->second) << ")" << (next(itr)!=mp.end() ? "," : ""); cout << "}"; return os; }
void dump_func(){DUMPOUT << endl;}
template <class Head, class... Tail>void dump_func(Head&& head, Tail&&... tail){ DUMPOUT << head; if (sizeof...(Tail) == 0) { DUMPOUT << " "; } else { DUMPOUT << ", "; } dump_func(std::move(tail)...);}
template<class T> inline bool chmax(T& a,T const& b){if(a>=b) return false; a=b; return true;}
template<class T> inline bool chmin(T& a,T const& b){if(a<=b) return false; a=b; return true;}
void _main();
int main(){ cin.tie(0); ios::sync_with_stdio(false); _main(); return 0;}
using ll = long long;
using P = pair<int,int>;
using Pl = pair<ll,ll>;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
const int mod=1e9+7,INF=1<<29;
const double EPS=1e-12,PI=3.1415926535897932384626;
const ll lmod = 1e9+7,LINF=1LL<<59; 
void _main(){
  int N; ll P;
  cin >> N >> P ;
  vl h(N+1); rep(i,N) cin >> h[i+1] ;
  h[0] = h[1];
  vl dp1(N+1),dp2(N+1);
  dp2[0] = LINF;
  rep(i,N){
    dp1[i+1] = min(min(dp1[i],dp2[i])+P,dp1[i]+max(0LL,h[i+1]-h[i]));
    dp2[i+1] = min(min(dp1[i],dp2[i])+P,dp2[i]+max(0LL,h[i]-h[i+1]));
    // dp1[i+1] = min(max(0LL,h[i+1]-h[i]),P)+min(dp1[i],dp2[i]+P);
    // dp2[i+1] = min(max(0LL,h[i+1]-h[i+2]),P)+min(dp1[i]+P,dp2[i]);
  }
  cout << min(dp1[N],dp2[N]) << endl;
} 
            
            
            
        