Submission #976995

#	Time	Username	Problem	Language	Result	Execution time	Memory
976995		dubabuba	이상한 기계 (APIO19_strange_device)	C++14	0 / 100	916 ms	2508 KiB

strange_device

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

typedef long long i64;
typedef pair<i64, i64> pii;
#define ff first
#define ss second
#define MP make_pair

struct tree {
	i64 tl, tr, sum;
	tree *lc, *rc;
	bool lazy;

	tree(i64 l, i64 r) {
		tl = l;
		tr = r;
		sum = 0;
		lazy = 0;
		lc = NULL;
		rc = NULL;
	}

	void upt(i64 l, i64 r) {
		if(lazy) return;
		if(tl == l && r == tr) {
			sum = r - l + 1;
			lazy = 1;
			return;
		}

		i64 tm = (tl + tr) / 2;
		if(lc == NULL) lc = new tree(tl, tm);
		if(rc == NULL) rc = new tree(tm + 1, tr);

		if(r <= tm) lc-> upt(l, r);
		else if(tm < l) rc-> upt(l, r);
		else {
			lc-> upt(l, tm);
			rc-> upt(tm + 1, r);
		}

		sum = lc-> sum + rc-> sum;
		if(lc-> lazy && rc-> lazy)
			lazy = 1;
	}
};

i64 gcd(i64 a, i64 b) {
	if(a == 0) return b;
	if(b == 0) return a;
	return gcd(b % a, a);
}

int main() {
	int n, gay = 0;
	i64 A, B;
	cin >> n >> A >> B;
	i64 T = A / gcd(A, B - 1) * B;

	// cout << T << endl;
	tree *root = new tree(0, T - 1);

	vector<pii> v;
	for(int i = 0; i < n; i++) {
		i64 l, r;
		cin >> l >> r;
		l %= T;
		r %= T;

		// cout << l << ' ' << r << endl;

		if(gay) continue;
		if(r - l + 1 >= T) {
			gay = 1;
			continue;
		}

		if(l <= r) {
			// cout << " > " << l << ' ' << r << endl;
			// root-> upt(l, r);
			v.push_back(MP(l, r));
		}
		else {
			// cout << " > " << l << ' ' << T - 1 << endl;
			// cout << " > " << 0 << ' ' << r << endl;
			// root-> upt(l, T - 1);
			// root-> upt(0, r);
			v.push_back(MP(l, T - 1));
			v.push_back(MP(0, r));
		}
	}

	if(gay) {
		cout << T << endl;
		return 0;
	}

	sort(v.begin(), v.end());

	i64 ans = 0;
	i64 l = 0, r = 0;
	for(pii p : v) {
		if(r < p.ff) {
			// cout << l << ' ' << r << endl;
			ans += (r - l + 1);
			l = p.ff;
		}
		r = p.ss;
	}
	// cout << l << ' ' << r << endl;
	ans += (r - l + 1);
	cout << ans << endl;
	return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:62:8: warning: unused variable 'root' [-Wunused-variable]
   62 |  tree *root = new tree(0, T - 1);
      |        ^~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 5
• Subtask 3: 0 / 5
• Subtask 4: 0 / 5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 30