제출 #264776

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
264776		dimash241	이상한 기계 (APIO19_strange_device)	C++17	100 / 100	580 ms	53476 KiB

strange_device

//#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops")
//#pragma GCC target("avx,avx2")
//#pragma GCC target("avx2")
//#pragma GCC optimize("O3")

//# include <x86intrin.h>
# include <bits/stdc++.h>

# include <ext/pb_ds/assoc_container.hpp>
# include <ext/pb_ds/tree_policy.hpp>

using namespace __gnu_pbds;
using namespace std;
 
template<typename T> using ordered_set = tree <T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#define _USE_MATH_DEFINES_
#define ll long long
#define ld long double
#define Accepted 0
#define pb push_back
#define mp make_pair
#define sz(x) (int)(x.size())
#define every(x) x.begin(),x.end()
#define F first
#define S second
#define lb lower_bound
#define ub upper_bound
#define For(i,x,y)  for (ll i = x; i <= y; i ++) 
#define FOr(i,x,y)  for (ll i = x; i >= y; i --)
#define SpeedForce ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0)
// ROAD to...                                                                                                                                                                                                                Red

void setIn(string s) { freopen(s.c_str(),"r",stdin); }
void setOut(string s) { freopen(s.c_str(),"w",stdout); }
void setIO(string s = "") {
	// cin.exceptions(cin.failbit); 
	// throws exception when do smth illegal
	// ex. try to read letter into int
	if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO
}

const double eps = 0.000001;
const ld pi = acos(-1);
const int maxn = 1e7 + 9;
const int mod = 1e9 + 7;
const ll MOD = 1e18 + 9;
const ll INF = 1e18 + 123;
const int inf = 2e9 + 11;
const int mxn = 1e6 + 9;
const int N = 6e5 + 123;                                          
const int M = 22;
const int pri = 997;
const int Magic = 2101;

const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, -1, 0, 1};
mt19937 gen(chrono::steady_clock::now().time_since_epoch().count());
 
int rnd (int l, int r) {
	return uniform_int_distribution<int> (l, r)(gen);
}
int n;
ll a, b;
vector < pair <ll, ll > > p;
int main () {
	SpeedForce;
	cin >> n >> a >> b;
	p.resize(n);
	for (auto &e : p) cin >> e.first >> e.second;
	
	a = a / __gcd(a,b+1);
	
	if (INF / a < b) {
		ll ans = 0;
		for (auto e : p) ans += e.second - e.first + 1;
		cout << ans << '\n';
		exit(0);
	}
	a *= b;
	vector < pair<ll, ll> > e;
	for (auto it : p) {
		if((ll)(it.first / a) + 1 < (ll)it.second / a) {
			cout << a << '\n';
			exit(0);
		}
		if (it.second/a == it.first/a) e.pb({it.first%a, it.second%a});
		else {
			e.pb({it.first % a, a-1});
			e.pb({0, it.second % a});
		}
	}
	sort(every(e));
	ll ans = 0;
	for (int i = 0; i < sz(e); ++i) {
		ll l, r;
		tie(l,r) = e[i];
		int j = i;
		while(j + 1 < sz(e) && e[j+1].first <= r) {
			++j;
			r = max(r, e[j].second);
		}
		ans += r - l + 1;
		i = j;
	}
	cout << ans << '\n';
	
	return Accepted;
}

// B...a

컴파일 시 표준 에러 (stderr) 메시지

strange_device.cpp: In function 'void setIn(std::string)':
strange_device.cpp:34:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   34 | void setIn(string s) { freopen(s.c_str(),"r",stdin); }
      |                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
strange_device.cpp: In function 'void setOut(std::string)':
strange_device.cpp:35:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   35 | void setOut(string s) { freopen(s.c_str(),"w",stdout); }
      |                         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• 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