Submission #388956

#	Time	Username	Problem	Language	Result	Execution time	Memory
388956		prvocislo	Boat (APIO16_boat)	C++17	31 / 100	1016 ms	524292 KiB

boat

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <queue>
#include <map>
#include <set>
#include <iomanip>
typedef long long ll;
using namespace std;

const ll mod = 1e9 + 7;
void upd(ll& a, const ll& b)
{
	a += b;
	if (a >= mod)a -= mod;
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n;
	cin >> n;
	vector<int> a(n + 1), b(n + 1);
	for (int i = 1; i <= n; i++) cin >> a[i] >> b[i];
	vector<int> v;
	for (int i = 0; i <= n; i++) for (int j = a[i]; j <= b[i]; j++) v.push_back(j);
	sort(v.begin(), v.end());
	v.erase(unique(v.begin(), v.end()), v.end());
	vector<ll> dp(v.size(), 0);
	dp[0] = 1;
	for (int i = 1; i <= n; i++)
	{
		ll sum = 0;
		for (int j = 0; j < v.size(); j++)
		{
			ll pv = dp[j];
			if (a[i] <= v[j] && v[j] <= b[i])
			{
				upd(dp[j], sum);
			}
			upd(sum, pv);
		}
	}
	ll ans = 0;
	for (int j = 1; j < v.size(); j++) upd(ans, dp[j]);
	cout << ans << "\n";
	return 0;
}

Compilation message (stderr)

boat.cpp: In function 'int main()':
boat.cpp:35:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |   for (int j = 0; j < v.size(); j++)
      |                   ~~^~~~~~~~~~
boat.cpp:46:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |  for (int j = 1; j < v.size(); j++) upd(ans, dp[j]);
      |                  ~~^~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 22 / 22
• Subtask 3: 0 / 27
• Subtask 4: 0 / 42