Submission #984295

#	Time	Username	Problem	Language	Result	Execution time	Memory
984295		Tsagana	Strange Device (APIO19_strange_device)	C++14	0 / 100	385 ms	69920 KiB

strange_device

#include<bits/stdc++.h>

#define IOS ios_base::sync_with_stdio(false);cin.tie();cout.tie();
#define all(x) x.begin(), x.end()
#define int long long
#define pi pair<int, int >
#define pq priority_queue
#define lb lower_bound
#define ub upper_bound
#define pb push_back
#define eb emplace_back
#define mset multiset
#define F first
#define S second

using namespace std;

int n, A, B, range;
vector<pair<int, int>> v;

int fastpow(int a, int b, int n) {
  if (!b) return 1;
  if (b % 2 == 0) {int r = fastpow(a, b / 2, n); return (r * r) % n;}
  else {int r = fastpow(a, b - 1, n); return (r * a) % n;}
}
int fastmul(int a, int b, int n) {
  if (b == 0) return 0;
  if (b % 2 == 0) {int r = fastmul(a, b / 2, n); return (r + r) % n;}
  else {int r = fastmul(a, b - 1, n); return (r + a) % n;}
}
int gcd(int a, int b) {return (!a ? b : gcd(b % a, a));}
void build() {
	int L = gcd(B+1, A);
	range = fastmul(A / L, B, 1e18);
}
void calc(int l, int r) {
	if (r - l > range) {v.pb({1, range}); return ;}
	int s = l / range;
	l %= range ;
	r -= s * range;
	if (r > range) r -= range;
	v.pb({l, 1});
	v.pb({r, 2});
}
int count() {
	sort(all(v));
	int ans = 0, se = 0, si = 0;
	for (auto i: v) {
		if (i.S & 1) {
			if (i.F > 0 && i.F <= se) ans += i.F - si + 1;
		}
		else {
			se = i.F;
			ans += i.F - si + 1;
		}
		si = i.F;
	}
	return ans;
}
void solve ()
{
	cin >> n >> A >> B;
	build();
	for (int i = 1; i <= n; i++) {
		int l, r; cin >> l >> r;
		calc(l, r);
	}
	cout << count();
}
signed main(){IOS solve(); return 0;}

• 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