Submission #127406

#	Time	Username	Problem	Language	Result	Execution time	Memory
127406		claudy	Strange Device (APIO19_strange_device)	C++14	100 / 100	1276 ms	79508 KiB

strange_device

//# pragma GCC optimize("Ofast,no-stack-protector")
//# pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
# pragma GCC optimize("Ofast")
# pragma GCC optimization ("unroll-loops")
# include "bits/stdc++.h"
std::pair<int,int> DR[] = {{-1,0},{0,1},{1,0},{0,-1},{-1,1},{-1,-1},{1,1},{1,-1}};
# define ll long long
# define clock (clock() * 1000.0 / CLOCKS_PER_SEC)
# define rc(s) return cout << s,0
# define rcg(s) cout << s;exit(0)
# define _ ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
# define db(x) cerr << #x << " = " << x << '\n'
# define pb push_back
# define mp make_pair
# define all(s) s.begin(),s.end()
# define sz(x) (int)((x).size())
# define int ll
using namespace std;

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# define LOCAL
# define sim template < class c
# define ris return * this
# define dor > debug & operator <<
# define eni(x) sim > typename \
enable_if<sizeof dud<c>(0) x 1, debug&>::type operator<<(c i) {
sim > struct rge { c b, e; };
sim > rge<c> range(c i, c j) { return rge<c>{i, j}; }
sim > auto dud(c* x) -> decltype(cerr << *x, 0);
sim > char dud(...);
struct debug {
#ifdef LOCAL
~debug() { cerr << endl; }
eni(!=) cerr << boolalpha << i; ris; }
eni(==) ris << range(begin(i), end(i)); }
sim, class b dor(pair < b, c > d) {
ris << "(" << d.first << ", " << d.second << ")";
}
sim dor(rge<c> d) {
*this << "[";
for (auto it = d.b; it != d.e; ++it)
*this << ", " + 2 * (it == d.b) << *it;
ris << "]";
}
#else
sim dor(const c&) { ris; }
#endif
};
#define show(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "
int gcd(int a, int b)
{
if(b) return gcd(b,a%b);
return a;
}mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

bool B = 1;
int n,a,b,l[1 << 20],r[1 << 20],cnt,ans;
map<int,int>m;

int32_t main(){_
	//freopen("input","r",stdin);
	cin >> n >> a >> b;
	a /= gcd(a,b + 1);
	int BIGSHAQ = 1e18;
	if(BIGSHAQ / a < b) B = 0;
	else a *= b;
	for(int i = 1;i <= n;i++)
	{
		cin >> l[i] >> r[i];
		cnt += r[i] - l[i] + 1;
	}
	if(!B) rc(cnt);
	for(int i = 1;i <= n;i++)
	{
		if(r[i] - l[i] + 1 >= a) rc(a);
		r[i] %= a;
		l[i] %= a;
		if(r[i] < l[i])
		{
			m[l[i]]++;
			m[a]--;
			m[0]++;
			m[r[i] + 1]--;
		}
		else
		{
			m[l[i]]++;
			m[r[i] + 1]--;
		}
	}
	int lstr = 0;
	int x = 0;
	ans = a;
	for(auto it : m)
	{
		if(x == 0) ans -= it.first - lstr;
		x += it.second;
		if(x == 0) lstr = it.first;
	}
	if(x == 0) ans -= a - lstr;
	rc(ans);
	return 0;
}

Compilation message (stderr)

strange_device.cpp:4:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 # pragma GCC optimization ("unroll-loops")

• 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