Submission #348119

#	Time	Username	Problem	Language	Result	Execution time	Memory
348119		arnold518	Strange Device (APIO19_strange_device)	C++14	100 / 100	867 ms	82936 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 1e6;

int N;
ll A, B, L;
pll P[MAXN+10];

map<ll, ll> M;

void addrange(ll l, ll r)
{
	M[l]++;
	M[r+1]--;
}

int main()
{
	scanf("%d%lld%lld", &N, &A, &B);
	for(int i=1; i<=N; i++) scanf("%lld%lld", &P[i].first, &P[i].second);

	L=__gcd(A, B+1);

	if(A/L>=(ll)1e18/B) L=1e18;
	else L=A/L*B;

	for(int i=1; i<=N; i++)
	{
		ll l=P[i].first, r=P[i].second;
		if(r-l+1>=L) return !printf("%lld\n", L);
		if(l%L<=r%L) addrange(l%L, r%L);
		else
		{
			addrange(l%L, L-1);
			addrange(0, r%L);
		}
	}

	M[L];
	ll t=0, ans=0;
	for(auto it=M.begin(); it!=M.end(); it++)
	{
		if(it->first==L) break;
		t+=it->second;
		if(t) ans+=next(it)->first-it->first;
	}
	printf("%lld\n", ans);
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:24:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   24 |  scanf("%d%lld%lld", &N, &A, &B);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:25:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |  for(int i=1; i<=N; i++) scanf("%lld%lld", &P[i].first, &P[i].second);
      |                          ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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