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Submission #974026

# Submission time Handle Problem Language Result Execution time Memory
974026 2024-05-02T15:27:11 Z THXuan Walking (NOI12_walking) C++14
25 / 25
 1 ms 424 KB 
#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
#include <set>
#include <map>
#define INF 1e9
using namespace std;
typedef long long ll;

void solve()
{
	int l, n; cin >> l >> n;
	vector<int>dp(n, 1);
	vector<pair<int, int>>v(n);
	for (int i = 0; i < n; i++) cin >> v[i].first >> v[i].second;
	sort(v.begin(), v.end());
	for (int i = n - 1; i >= 0; i--) {
		for (int j = i + 1; j < n; j++) {
			double a = ((double)l / (double)v[i].second) + v[i].first;
			double b = ((double)l / (double)v[j].second) + v[j].first;
			//cout << a << " " << b << "\n";
			if (a > b)dp[i] = max(dp[i], dp[j] + 1);
		}
	}
	int ans = 0;
	for (int i = 0; i < n; i++) ans = max(ans, dp[i]);
	cout << ans << "\n";
	
}

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int t = 1;// cin>>t;
	while (t--) solve();
	return 0;
}

Subtask #1
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct

Subtask #2
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 424 KB Output is correct
4 Correct 0 ms 348 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct

Subtask #4
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct

Subtask #5
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct