Submission #756885

#	Time	Username	Problem	Language	Result	Execution time	Memory
756885		SanguineChameleon	Fish (IOI08_fish)	C++17	75 / 100	3057 ms	26368 KiB

fish

#include <bits/stdc++.h>
using namespace std;

void just_do_it();

int main() {
	#ifdef KAMIRULEZ
		freopen("kamirulez.inp", "r", stdin);
		freopen("kamirulez.out", "w", stdout);
	#endif
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	just_do_it();
	return 0;
}

const int maxn = 5e5 + 20;
pair<int, int> a[maxn];
vector<int> pos[maxn];
int cnt[maxn];
int tree[maxn];
int id[maxn];
int max_id[maxn];
int mod;

void update(int id, int lt, int rt, int pos, int val) {
	tree[pos] = val;
}

void just_do_it() {
	int n, k;
	cin >> n >> k >> mod;
	for (int i = 1; i <= n; i++) {
		cin >> a[i].first >> a[i].second;
	}
	sort(a + 1, a + n + 1);
	k = 0;
	for (int i = n; i >= 1; i--) {
		if (!id[a[i].second]) {
			id[a[i].second] = ++k;
		}
		a[i].second = id[a[i].second];
	}
	for (int i = 1; i <= n; i++) {
		cnt[a[i].second]++;
		pos[a[i].second].push_back(i);
	}
	for (int i = 1; i <= k; i++) {
		cnt[i]++;
	}
	for (int i = n; i >= 1; i--) {
		max_id[i] = max(max_id[i + 1], a[i].second);
	}
	int lt = n;
	int res = 0;
	for (int i = n; i >= 1; i--) {
		while (lt > 0 && a[lt].first * 2 > a[i].first) {
			cnt[a[lt].second]--;
			//update(a[lt].second, cnt[a[lt].second]);
			lt--;
		}
		if (max_id[i] != max_id[i + 1]) {
			int x = max_id[i];
			int prod = cnt[x] - 1;
			for (int j = x; j <= k; j++) {
				if (j != x) {
					prod = prod * (cnt[j] % mod) % mod;
				}
			}
			res += prod;
			res %= mod;
			int low = max_id[lower_bound(a + 1, a + n + 1, make_pair(a[pos[x][cnt[x] - 1]].first * 2, -1)) - a] + 1;
			prod = 1;
			for (int j = low; j <= k; j++) {
				if (j != x) {
					prod = prod * (cnt[j] % mod) % mod;
				}
			}
			res += prod;
			res %= mod;
		}
	}
	cout << res;
}

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 4 / 4
• Subtask 4: 4 / 4
• Subtask 5: 4 / 4
• Subtask 6: 5 / 5
• Subtask 7: 6 / 6
• Subtask 8: 6 / 6
• Subtask 9: 6 / 6
• Subtask 10: 6 / 6
• Subtask 11: 7 / 7
• Subtask 12: 7 / 7
• Subtask 13: 7 / 7
• Subtask 14: 5 / 5
• Subtask 15: 0 / 5
• Subtask 16: 0 / 5
• Subtask 17: 0 / 5
• Subtask 18: 0 / 5
• Subtask 19: 0 / 5