Submission #717878

#	Time	Username	Problem	Language	Result	Execution time	Memory
717878		Radin_Zahedi2	Financial Report (JOI21_financial)	C++17	100 / 100	132 ms	12676 KiB

Main

#include<bits/stdc++.h>
//#pragma GCC optimize("O2")
using namespace std;
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define sz(x) (int)x.size()
#define endl '\n'
     
     
int n, d;
const int N = 3e5 + 5;
const int L = (1 << 19);
int a[N];
     
int mini[N];
int reach[N];

int seg[(L << 1)];

void upd(int b, int e, int x) {
	e++;

	b += L;
	e += L;

	while (b != e) {
		if (b & 1) {
			seg[b] = max(seg[b], x);

			b++;
		}
		if (e & 1) {
			e--;

			seg[e] = max(seg[e], x);
		}

		b >>= 1;
		e >>= 1;
	}
}

int get(int ind) {
	ind += L;

	int ans = 0;

	while (ind) {
		ans = max(ans, seg[ind]);

		ind >>= 1;
	}

	return ans;
}

void input() {
    cin >> n >> d;
     
    for (int i = 1; i <= n; i++) {
    	cin >> a[i];
		//a[i] = i;
    }
}
     
void cremini() {
    deque<int> dq;
    for (int i = 1; i < d; i++) {
    	while (!dq.empty()) {
    		if (a[dq.front()] < a[i]) {
    			break;
    		}

    		dq.pop_front();
    	}
    	dq.push_front(i);
    }
     
    for (int i = d; i <= n; i++) {
    	while (!dq.empty()) {
    		if (a[dq.front()] < a[i]) {
    			break;
    		}
     
    		dq.pop_front();
    	}
    	dq.push_front(i);
     
    	if (dq.back() == i - d) {
    		dq.pop_back();
    	}
     
    	mini[i] = a[dq.back()];
    }
}

void crereach() {
    vector<int> obs;
    for (int i = n; i >= 1; i--) {
    	int lobs = sz(obs), robs = -1;
    	while (lobs - 1 != robs) {
    		int m = (lobs + robs + 1) / 2;
     
    		if (mini[obs[m]] > a[i]) {
    			robs = m;
    		}
    		else {
    			lobs = m;
    		}
    	}
     
    	reach[i] = n;
    	if (robs != -1) {
    		reach[i] = obs[robs];
    	}

    	if (i + d - 1 <= n) {
    		while (!obs.empty()) {
    			if (mini[i + d - 1] < mini[obs.back()]) {
    				break;
    			}
    			
    			obs.pop_back();
    		}
    		obs.pb(i + d - 1);
    	}
    }
}
     
void solve() {
    cremini();
    crereach();
     

	int dp[n + 1];

	pair<int, int> nums[n + 1];;
	for (int i = 1; i <= n; i++) {
		nums[i] = mp(a[i], -i);
	}

	sort(nums + 1, nums + n + 1);
	for (int i = 1; i <= n; i++) {
		int ind = -nums[i].se;

		dp[ind] = get(ind) + 1;

		upd(ind + 1, reach[ind], dp[ind]);
	}
     
     
    int ans = 0;
    for (int i = 1; i <= n; i++) {
    	ans = max(ans, dp[i]);
    }
     
    cout << ans;
}
     
int main() {
    ios::sync_with_stdio(false);
	cin.tie(0);
    cout.tie(0);
     
    input();
     
    solve();
     
    return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 20 / 20
• Subtask 4: 12 / 12
• Subtask 5: 5 / 5
• Subtask 6: 35 / 35