Submission #1267956

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267956		SmuggingSpun	Two Antennas (JOI19_antennas)	C++20	13 / 100	61 ms	17988 KiB

antennas

#include<bits/stdc++.h>
#define taskname "A"
using namespace std;
template<class T>void maximize(T& a, T b){
	if(a < b){
		a = b;
	}
}
const int lim = 25e4 + 5;
int n, q, h[lim], a[lim], b[lim];
namespace sub1{
	void solve(){
		for(int _ = 0; _ < q; _++){
			int l, r, ans = -1;
			cin >> l >> r;
			for(int i = l; i < r; i++){
				for(int j = r; j > i; j--){
					int d = j - i;
					if(max(a[i], a[j]) <= d && min(b[i], b[j]) >= d){
						maximize(ans, abs(h[i] - h[j]));
					}
				}
			}
			cout << ans << "\n";
		}
	}
}
namespace sub2{
	void solve(){
		vector<vector<int>>f(n + 1, vector<int>(n + 1, -1));
		for(int i = 1; i < n; i++){
			for(int l = 1; true; l++){
				int r = l + i;
				f[l][r] = max({f[l][r - 1], f[l + 1][r], max(a[l], a[r]) <= i && min(b[l], b[r]) >= i ? abs(h[l] - h[r]) : -1});
				if(r == n){
					break;
				}
			}
		}
		for(int _ = 0; _ < q; _++){
			int l, r;
			cin >> l >> r;
			cout << f[l][r] << "\n";
		}
	}
}
namespace sub34{
	void solve(){
		
	}
}
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(fopen(taskname".inp", "r")){
		freopen(taskname".inp", "r", stdin);
	}
	cin >> n;
	for(int i = 1; i <= n; i++){
		cin >> h[i] >> a[i] >> b[i];
	}
	cin >> q;
	if(max(n, q) <= 300){
		sub1::solve();
	}
	else if(n <= 2000){
		sub2::solve();
	}
	else{
		sub34::solve();
	}
}

Compilation message (stderr)

antennas.cpp: In function 'int main()':
antennas.cpp:55:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |                 freopen(taskname".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 2 / 2
• Subtask 2: 11 / 11
• Subtask 3: 0 / 22
• Subtask 4: 0 / 65