Submission #1017153

#	Time	Username	Problem	Language	Result	Execution time	Memory
1017153		NguyenPhucThang	Rabbit Carrot (LMIO19_triusis)	C++14	100 / 100	92 ms	13516 KiB

triusis

#include <bits/stdc++.h>
#define forr(i, a, b) for (int i = a; i <= b; i++)
#define ford(i, a, b) for (int i = a; i >= b; i--)
#define fi first
#define se second
#define pb push_back
#define all(v) v.begin(), v.end()
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define vi vector<int>
#define vii vector<pii>
#define file "test"

using namespace std;
const int base = 31;
const ll mod = 1e9 + 7;
const ll oo = 1e18;
const int N = 4e5 + 5;
const int V = 4e5;

int dp[N], st[4*N];
ll h[N], t[N];
vector<ll> nen;

void update(int id, int l, int r, int i, int v){
   if (i < l ||  r < i) return;
   if (l == r){
      st[id] = max(st[id], v);
      return;
   }

   int mid = (l + r) >> 1;
   update(2 * id, l, mid, i, v), update(2 * id + 1, mid + 1, r, i, v);
   st[id] = max(st[2 * id], st[2 * id + 1]);
}

int get(int id, int l, int r, int u, int v){
   if (v < l || r < u) return 0;
   if (u <= l && r <= v) return st[id];
   
   int mid = (l + r) >> 1;
   return max(get(2 * id, l, mid, u, v), get(2 * id + 1, mid + 1, r, u, v));
}

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

   int n, M;
   cin >> n >> M;
   n += 1;
   h[1] = 0;
   t[1] = h[1] - M;
   nen.pb(t[1]);
   forr(i, 2, n){
      cin >> h[i];
      t[i] = h[i] - M*i;
      nen.pb(t[i]);
   }


   sort(all(nen));
   nen.resize(unique(all(nen)) - nen.begin());
   forr(i,1,n) t[i] = lower_bound(all(nen), t[i]) - nen.begin() + 1;

   dp[1] = 1;
   update(1, 1, V, t[1], dp[1]);

   forr(i, 2, n){
      int f = get(1, 1, V, t[i], V);
      if (f) {
         dp[i] = f + 1;
         update(1, 1, V, t[i], dp[i]);
      }
   }

   int res = 0;
   forr(i, 1, n) dp[i] -= 1;
   forr(i, 2, n) res = max(res, dp[i]);

   cout << (n - 1) - res;

   return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 21 / 21
• Subtask 3: 28 / 28
• Subtask 4: 37 / 37