Submission #886431

#	Time	Username	Problem	Language	Result	Execution time	Memory
886431		tsumondai	Double Attendance (CCO22_day1problem3)	C++14	0 / 25	2 ms	13144 KiB

Main

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

#define Task "problemname"
#define int long long
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define foru(i, l, r) for(int i = l; i <= r; i++)
#define ford(i, r, l) for(int i = r; i >= l; i--)
#define __TIME  (1.0 * clock() / CLOCKS_PER_SEC)

typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef pair<ii, ii> iiii;

const int N = 1e6 + 5;

const int oo = oo, mod = 1e9 + 7;

int n[2], k, dist[2][600600];
pair<int, int> a[2][300300];
priority_queue<array<int, 3>, vector<array<int, 3>>, greater<array<int, 3>>> pq;

int getidx(int t, int p) {
	return upper_bound(a[t] + 1, a[t] + n[t] + 1, pair<int, int>(p, oo)) - a[t] - 1;
}

int calc(int t, int l, int r) {
	int li = getidx(t, l), ri = getidx(t, r);
	return ri - li + (a[t][li].first <= l && l < a[t][li].second);
}

void push(int t, int c, int d) {
	if (dist[t][c] <= d) return;
	dist[t][c] = d;
	pq.push({d, t, c});
}

void process() {
	cin >> n[0] >> n[1] >> k;
	for (int i = 0; i < 2; i++) {
		for (int j = 1; j <= n[i]; j++) {
			cin >> a[i][j].fi >> a[i][j].se;
		}

		sort(a[i] + 1, a[i] + n[i] + 1);
	}

	for (int i = 0; i < 2; i++) fill(dist[i], dist[i] + 600600, oo);
	if (a[0][1].first == 0) {
		dist[0][1] = 0;
		pq.push({0, 0, 1});
	}
	else {
		dist[0][0] = 0;
		pq.push({0, 0, 0});
	}

	int ans = 0;
	while (!pq.empty()) {
		/*auto [d, t, c]*/ auto tmp = pq.top(); pq.pop();
		int d, t, c;
		d = tmp[0], t = tmp[1], c = tmp[2];
		if (d > dist[t][c]) continue;
		if (d > oo / 2) continue;
		ans = max(ans, c);


		int idx = getidx(t, d);

		if (idx + 1 <= n[t]) {
			push(t, c + 1, a[t][idx + 1].first);
		}


		int e = d + k;

		if (a[t][idx].first <= d && d < a[t][idx].second) {
			e = max(d + k, a[t][idx].second - k);
		}

		push(t ^ 1, c + calc(t ^ 1, d + k, e), e);

	}

	cout << ans;
}
signed main() {
	cin.tie(0)->sync_with_stdio(false);
	if (fopen(Task".INP", "r")) {
		freopen(Task".INP", "r", stdin);
		freopen(Task".OUT", "w", stdout);
	}
	process();
	cerr << "Time elapsed: " << __TIME << " s.\n";
	return 0;
}

// dont stop

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:93:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |   freopen(Task".INP", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:94:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |   freopen(Task".OUT", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 6
• Subtask 4: 0 / 4