Submission #135153

#	Time	Username	Problem	Language	Result	Execution time	Memory
135153		jhnah917	Strange Device (APIO19_strange_device)	C++14	35 / 100	702 ms	18500 KiB

strange_device

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

typedef long long ll;
typedef pair<ll, ll> p;

ll n, a, b, c, sz;

int main(){
	ios_base::sync_with_stdio(0); cin.tie(0);
	cin >> n >> a >> b;
	sz = a / __gcd(a, b+1) * b;
	vector<p> v;
	
	for(int i=0; i<n; i++){
		ll l, r; cin >> l >> r;
		if(r-l+1 > sz){
			cout << sz; return 0;
		}
		l %= sz, r %= sz;
		if(l <= r) v.emplace_back(l, r);
		else v.emplace_back(l, sz-1), v.emplace_back(0, r);
	}
	sort(v.begin(), v.end());
	ll ans = 0;
	for(int i=0; i<v.size(); i++){
		int j = i; ll now = v[i].second;
		while(j < v.size() && v[j].first <= now){
			now = max(now, v[j].second); j++;
		}
		ans += now - v[i].first + 1;
		i = j - 1;
	}
	cout << ans;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:26:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<v.size(); i++){
               ~^~~~~~~~~
strange_device.cpp:28:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(j < v.size() && v[j].first <= now){
         ~~^~~~~~~~~~

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