Submission #249050

#	Time	Username	Problem	Language	Result	Execution time	Memory
249050		crossing0ver	Strange Device (APIO19_strange_device)	C++17	100 / 100	633 ms	23960 KiB

strange_device

#include<bits/stdc++.h>
#define tm (tl + tr)/2
#define inf 1100000000000000000
#define ll long long
using namespace std;

struct tre{
	bool lazy;
	ll sum;
	ll L,R;
	tre() {
		lazy = sum = L = R = 0;
	}
};
vector<tre>t(1);

void push(ll v,ll tl,ll tr,ll L,ll R) {
	if (t[v].lazy) {
		t[L].lazy = t[R].lazy = 1;
		t[L].sum = tm - tl+1;
		t[R].sum = tr - tm;
		t[v].lazy = 0;
	}
}

void upd(ll v,ll tl,ll tr,ll l,ll r) {
	if (l > tr || r < tl || t[v].lazy) return;
	if (l <= tl && r >= tr) {
		t[v].lazy = 1;
		t[v].sum = tr - tl + 1;
		return;
	}
	if (t[v].L == 0) {
		t[v].L = t.size();
		t.push_back(tre());
	}
	if (t[v].R == 0) {
		t[v].R = t.size();
		t.push_back(tre());
	}
	push(v,tl,tr,t[v].L,t[v].R);
	upd(t[v].L,tl,tm,l,r);
	upd(t[v].R,tm+1,tr,l,r);
	t[v].sum = t[ t[v].L ].sum + t[ t[v].R ].sum;
}


main() {
	ios::sync_with_stdio(false);
	ll n,a,b;
	cin >> n >> a >> b;
	ll m = a/(__gcd(a,b+1));
	if (m > inf/b) m = inf;
	
	else m*=b;
	vector<pair<ll,ll> > v;
		for (ll l,r;n--;) {
		cin >> l >> r;
		if (r - l + 1 >= m) {
			cout << m <<'\n';
			exit(0);
		}
		l%=m;
		r%=m;
		if (l < 0) l+=m;
		if (r < 0) r+=m;
		if ( l <= r) {
			v.push_back({l,r});
		//	upd(0,0,m-1,l,r);
		}
		else {
			v.push_back({0,r});
			v.push_back({l,m-1});
		//	upd(0,0,m-1,l,m-1);
		//	upd(0,0,m-1,0,r);
		}
	}
	sort(v.begin(),v.end());
	ll st = 0, en = -1,ans = 0;
	for (auto i : v) {
		ll x = i.first, y =i.second;
		if (y <= en) continue;
		if (x > en) {
			ans += y - x + 1;
			st = x; 
			en = y;
		}
		else {
			ans += y - en;
			st = x;
			en = y;
		}
	}
	
	cout << ans;
	
}

Compilation message (stderr)

strange_device.cpp: In constructor 'tre::tre()':
strange_device.cpp:12:14: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   lazy = sum = L = R = 0;
          ~~~~^~~~~~~~~~~
strange_device.cpp: At global scope:
strange_device.cpp:48:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^
strange_device.cpp: In function 'int main()':
strange_device.cpp:79:5: warning: variable 'st' set but not used [-Wunused-but-set-variable]
  ll st = 0, en = -1,ans = 0;
     ^~

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