Submission #871705

#	Time	Username	Problem	Language	Result	Execution time	Memory
871705		serifefedartar	Strange Device (APIO19_strange_device)	C++17	10 / 100	670 ms	88876 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
 
#define fast ios::sync_with_stdio(0);cin.tie(0);
#define s second
#define f first
typedef long long ll;
const ll MOD = 1e9+9;
const ll LOGN = 20; 
const ll MAXN = 6 * 1e6 + 50;

vector<pair<ll,ll>> v;
vector<ll> cc;
ll calc(ll A, ll B) {
	if (1e18 / A < B)
		return 1e18;
	if (1e18 / B < A)
		return 1e18;
	return A * B;
}

int index(ll k) {
	return upper_bound(cc.begin(), cc.end(), k) - cc.begin();
}
ll cnt[MAXN];

int main() {
	fast
	ll n, A, B;
	cin >> n >> A >> B;

	ll period = calc(A, B);
	for (int i = 1; i <= n; i++) {
		ll l, r;
		cin >> l >> r;
		ll left_mod = l % period;
		ll right_mod = r % period;
		if (r - l + 1 > period - left_mod) {
			v.push_back({left_mod, period - 1});
			v.push_back({0, right_mod});
		} else
			v.push_back({left_mod, right_mod});
	}

	for (auto u : v) {
		cc.push_back(u.f);
		cc.push_back(u.s);
		cc.push_back(u.s+1);
	}
	sort(cc.begin(), cc.end());
	cc.erase(unique(cc.begin(), cc.end()), cc.end());

	for (auto u : v) {
		cnt[index(u.f)]++;
		cnt[index(u.s + 1)]--;
	}
	for (int i = 1; i < MAXN; i++)
		cnt[i] += cnt[i-1];

	ll ans = 0;
	for (int i = 0; i < cc.size() - 1; i++) {
		if (cnt[i+1]) {
			ans += cc[i+1] - cc[i];
		}
	}
	cout << ans << "\n";
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:61:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |  for (int i = 0; i < cc.size() - 1; i++) {
      |                  ~~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 0 / 5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 30