Submission #1300704

#	Time	Username	Problem	Language	Result	Execution time	Memory
1300704		KickingKun	Two Antennas (JOI19_antennas)	C++20	13 / 100	476 ms	18296 KiB

antennas

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

#define ll long long
#define ull unsigned long long
#define ld long double
#define bigint __int128
#define emb emplace_back
#define pb push_back
#define pii pair <int, int>
#define fi first
#define se second
#define all(v) v.begin(), v.end()
#define Task ""

#define MASK(k) (1ull << k)
#define bitcnt(k) __builtin_popcount(k)
#define testBit(n, k) ((n >> k) & 1)
#define flipBit(n, k) (n ^ (1ll << k))
#define offBit(n, k) (n & ~MASK(k))
#define onBit(n, k) (n | (1ll << k))

template <class T> bool minimize(T &a, T b) {if (a > b) {a = b; return true;} return false;}
template <class T> bool maximize(T &a, T b) {if (a < b) {a = b; return true;} return false;}

const int N = 2e5 + 5, lim = 60, mod = 1e9 + 7;
const ll INF = 1e18;

int n, h[N], a[N], b[N];

namespace sub2 {
	const int N = 2e3 + 5;
	int res[N][N];

	void solve() {
		memset(res, -1, sizeof res);
		for (int u = 1; u <= n; u++) {
			for (int v = u + a[u]; v <= min(n, u + b[u]); v++) {
				if (v - b[v] <= u && u <= v - a[v])
					res[u][v] = abs(h[u] - h[v]);
			}
		}

		for (int u = n; u > 0; u--) {
			for (int v = u + 1; v <= n; v++) {
				maximize(res[u][v], max(res[u + 1][v], res[u][v - 1]));
			}
		}

		int q; cin >> q;
		while (q--) {
			int l, r; cin >> l >> r;
			cout << res[l][r] << '\n';
		}
	}
}

int main() {
	ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);

	if (fopen(Task".inp", "r")) {
		freopen(Task".inp", "r", stdin);
		freopen(Task".out", "w", stdout);
	}

	cin >> n;
	for (int i = 1; i <= n; i++)
		cin >> h[i] >> a[i] >> b[i];

	sub2::solve();
}

Compilation message (stderr)

antennas.cpp: In function 'int main()':
antennas.cpp:62:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |                 freopen(Task".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
antennas.cpp:63:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |                 freopen(Task".out", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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