Submission #1016979

#	Time	Username	Problem	Language	Result	Execution time	Memory
1016979		NguyenPhucThang	Rabbit Carrot (LMIO19_triusis)	C++14	0 / 100	18 ms	24004 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 = 2e5 + 5;
const int V = 2e5;

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);
#ifndef ONLINE_JUDGE
   freopen(file".inp", "r", stdin);
   freopen(file".out", "w", stdout);
#endif
   int n, M;
   cin >> n >> M;
   forr(i, 1, n){
      cin >> h[i];
      t[i] = h[i] - M*i;
      nen.pb(t[i]);
   }

   nen.pb(0);
   sort(all(nen));
   nen.resize(unique(all(nen)) - nen.begin());
   forr(i,0,n) t[i] = lower_bound(all(nen), t[i]) - nen.begin() - 1;

   dp[0] = 1;
   update(1, 1, V, t[0], dp[0]);

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

   cout << n - res + 1;

   return 0;
}

Compilation message (stderr)

triusis.cpp: In function 'int main()':
triusis.cpp:52:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |    freopen(file".inp", "r", stdin);
      |    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
triusis.cpp:53:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |    freopen(file".out", "w", stdout);
      |    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 14
• Subtask 2: 0 / 21
• Subtask 3: 0 / 28
• Subtask 4: 0 / 37