Submission #249895

#	Time	Username	Problem	Language	Result	Execution time	Memory
249895		godwind	Strange Device (APIO19_strange_device)	C++14	100 / 100	969 ms	84568 KiB

strange_device

#include <iostream>
#include <vector>
#include <algorithm>
#include <random>
#include <set>
#include <map>
#include <queue>
#include <cstring>
#include <cmath>
#include <bitset>
#include <iomanip>
#include <functional>
//#include <unordered_map>
 
using namespace std;
 
template<typename T> void uin(T &a, T b) {if (b < a) a = b;}
template<typename T> void uax(T &a, T b) {if (b > a) a = b;}
 
#define int long long
#define double long double
#define left left228
#define right right228
#define mp make_pair
#define all(v) v.begin(), v.end()

const int INF = 1100LL * 1000LL * 1000LL * 1000LL * 1000LL * 1000LL;

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

int mult(int a, int b) {
	if (a > INF / b) {
		return INF;
	}
	return min( INF, a * b );
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
	int n, A, B;
	cin >> n >> A >> B;
	int MOD = mult(A, B);
	MOD /= gcd(A, B + 1);
	set< pair<int,int> > s;
	map<int,int>bal;
	int ans = 0;
	bool all = 0;
	for (int i = 0; i < n; ++i) {
		int l, r;
		cin >> l >> r;
		if (r - l + 1 >= MOD) {
			all = 1;
		}
		int lm = l % MOD;
		int rm = r % MOD;
		if (lm <= rm) {
			++bal[lm];
			--bal[rm + 1];
		} else {
			++bal[lm];
			--bal[MOD];
			++bal[0];
			--bal[rm + 1];
		}
	}
	if (all) {
		cout << MOD << '\n';
		return 0;
	}
	vector< pair<int, int> > v;
	for (auto p : bal) {
		v.emplace_back(p);
	}
	int balance = 0;
	for (int i = 0; i < (int)v.size() - 1; ++i) {
		balance += v[i].second;
		if (balance > 0) {
			ans += v[i + 1].first - v[i].first;
		}
	}
	cout << ans << '\n';
    return 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