Submission #582253

#	Time	Username	Problem	Language	Result	Execution time	Memory
582253		vbee	Rabbit Carrot (LMIO19_triusis)	C++14	100 / 100	112 ms	10988 KiB

triusis

#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define ii pair<int,int>
#define vii vector<ii>
#define vi vector<int>
#define fi first
#define se second
#define TASK "rabbitcarrot"
#define ll long long
#define pll pair<ll, ll>
#define vll vector<ll>
#define vpll vector<pll>
#define pb push_back
#define MASK(i) (1 << (i))
#define BIT(x, i) ((x >> (i)) & 1)
 
using namespace std;

const int oo = 1e9 + 7;
const ll loo = (ll)1e18 + 7; 
const int N = 2e5 + 7;

ll n, a[N], m, c[N];

struct segtree{
	vector<int> t;
	segtree(){
		t.resize(N * 4 + 7);
	}
	void update(int v, int lt, int rt, int pos, int value){
		if (lt == rt) return (void)(t[v]= value);
		int middle = (rt + lt) / 2;
		if (pos <= middle) update(v * 2, lt, middle, pos, value);
		else update(v * 2 + 1, middle + 1, rt, pos, value);
		t[v] = max(t[v * 2], t[v * 2 + 1]);
	}
	int getmax(int v, int lt, int rt, int l, int r){
		if (l > r) return -oo;
		if (lt == l && rt == r) return t[v];
		int middle = (rt + lt) / 2;
		return max(getmax(v * 2, lt, middle, l, min(middle, r)), getmax(v * 2 + 1, middle + 1, rt, max(middle + 1, l), r));
	}
};
vector<ll> id;
int newid[N];
int getcompressedvalue(ll x){
	return lower_bound(all(id), x) - id.begin();
}
int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	// freopen(TASK".inp", "r", stdin);
	// freopen(TASK".out", "w", stdout);
	cin >> n >> m;
	segtree seg;
	for (int i = 1; i <= n; i++){
		cin >> a[i];
		c[i] = m * i - a[i];
		id.pb(c[i]);
	}	
	sort(all(id));
	id.resize(unique(all(id)) - id.begin());
	for (int i = 1; i <= n; i++){
		newid[i] = getcompressedvalue(c[i]) + 2;
	}
	int res = 0;
	// for (int i = 1; i <= n; i++) cout << c[i] << " ";
	for (int i = 1; i <= n; i++){
		if (c[i] < 0) continue;
		int temp = seg.getmax(1, 1, N, 1, newid[i]) + 1;
		res = max(res, temp);
		seg.update(1, 1, N, newid[i], temp);
	}
	cout << n - res;
	return 0;
}

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