Submission #936557

#	Time	Username	Problem	Language	Result	Execution time	Memory
936557		penguin133	Advertisement 2 (JOI23_ho_t2)	C++17	10 / 100	121 ms	19780 KiB

Main

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

#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

int dp[500005], dp2[500005], n;
pi A[500005];

void solve(){
	cin >> n;
	for(int i = 1; i <= n; i++)cin >> A[i].fi >> A[i].se;
	sort(A + 1, A + n + 1);
	stack <int> s;
	for(int i = 1; i <= n; i++){
		while(!s.empty() && A[s.top()].fi - A[s.top()].se >= A[i].fi - A[i].se)s.pop();
		dp[i] = (s.empty() ? 0 : dp[s.top()]) + 1;
		s.push(i);
	}
	while(!s.empty())s.pop();
	for(int i = n; i >= 1; i--){
		while(!s.empty() && A[s.top()].fi + A[s.top()].se <= A[i].fi + A[i].se)s.pop();
		dp2[i] = (s.empty() ? 0 : dp2[s.top()]) + 1;
		s.push(i);
	}
	dp2[0] = 1e18;
	int ans = 1e18, mn = 1e18;
	for(int i = 0; i <= n; i++){
		ans = min({ans, dp[i] + mn, dp[i] + dp2[i] - 1, dp[i] + dp2[i + 1]});
		mn = min(mn, dp2[i]);
	}
	cout << ans;
}

main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int tc = 1;
	//cin >> tc;
	for(int tc1=1;tc1<=tc;tc1++){
		// cout << "Case #" << tc1 << ": ";
		solve();
	}
}

Compilation message (stderr)

Main.cpp:42:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   42 | main(){
      | ^~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 23
• Subtask 3: 0 / 36
• Subtask 4: 0 / 31