Submission #253301

#	Time	Username	Problem	Language	Result	Execution time	Memory
253301		DystoriaX	Rabbit Carrot (LMIO19_triusis)	C++14	100 / 100	68 ms	4720 KiB

triusis

#include <bits/stdc++.h>

using namespace std;

int n, m;
int h[200010];
int bit[200010];

const int MAX = 200005;

vector<tuple<int, int, int> > vq;
vector<int> cmp;

void init(){
	for(int i = 1; i <= MAX; i++) bit[i] = 1e9;
}

void update(int x, int val){
	for(; x <= MAX; x += x & (-x)) bit[x] = min(bit[x], val);
}

int query(int x){
	int ret = 1e9;

	for(; x; x -= x & (-x)) ret = min(ret, bit[x]);

	return ret;
}

int getIdx(int val){
	return (int) (upper_bound(cmp.begin(), cmp.end(), val) - cmp.begin());
}

int main(){
	ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
	
	cin >> n >> m;

	for(int i = 1; i <= n; i++){
		cin >> h[i];
		
		if(h[i] <= i * m) cmp.emplace_back(i * m - h[i]);
	}

	cmp.emplace_back(0);
	sort(cmp.begin(), cmp.end());
	cmp.erase(unique(cmp.begin(), cmp.end()), cmp.end());

	// for(auto &k : cmp) cerr << k << " ";
	// 	cerr << "\n";

	init();
	update(getIdx(0), 0);

	for(int i = 1; i <= n; i++){
		if(h[i] > i * m) continue;

		int delta = getIdx(i * m - h[i]);

		// cerr << "Index of delta: " << delta << " will update with value " << i + query(delta) - 1 << "\n";
		update(delta, query(delta) - 1);
	}

	cout << n + query(MAX) << "\n";

	return 0;
}

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