Submission #1174663

#	Time	Username	Problem	Language	Result	Execution time	Memory
1174663		Tsagana	Cat Exercise (JOI23_ho_t4)	C++20	41 / 100	76 ms	22264 KiB

Main

#include<bits/stdc++.h>

#define IOS ios_base::sync_with_stdio(false);cin.tie();cout.tie();
#define all(x) x.begin(), x.end()
#define int long long
#define pq priority_queue
#define eb emplace_back
#define lb lower_bound
#define ub upper_bound
#define pb push_back
#define pp pop_back
#define F first
#define S second

using namespace std;

int n;
vector<int> N;
vector<int> v;
vector<int> P;

void build(int id, int L, int R) {
	if (L + 1 == R) {N[id] = v[L]; return ;}
	int M = (L + R) / 2, x = 2 * id, y = x + 1;
	build(x, L, M);
	build(y, M, R);
	N[id] = max(N[x], N[y]);
}

int query(int id, int L, int R, int l, int r) {
	if (L >= r || l >= R) return 0;
	if (L >= l && r >= R) return N[id];
	int M = (L + R) / 2, x = 2 * id, y = x + 1;
	int sl = query(x, L, M, l, r);
	int sr = query(y, M, R, l, r);
	return max(sl, sr);
}

int calc(int M, int L, int R) {
	if (M == 0 || L + 1 == R) return 0;
	if (P[M] == L) {
		int r = query(1, 0, n, P[M] + 1, R);
		return calc(r, P[M] + 1, R) + P[r] - P[M];
	}
	if (P[M] + 1 == R) {
		int l = query(1, 0, n, L, P[M]);
		return calc(l, L, P[M]) + P[M] - P[l];
	}
	int l = query(1, 0, n, L, P[M]);
	int r = query(1, 0, n, P[M] + 1, R);
	return max(calc(l, L, P[M]) + P[M] - P[l], calc(r, P[M] + 1, R) + P[r] - P[M]);
}

void solve() {
	cin >> n;
	v = vector<int>(n);
	P = vector<int>(n);
	for (int i = 0; i < n; i++) {cin >> v[i]; v[i]--; P[v[i]] = i;}
	for (int i = 1, a, b; i < n; i++) cin >> a >> b;
	N = vector<int>(4*n, 0);
	build(1, 0, n);
	cout << calc(n - 1, 0, n) << '\n';
}
signed main() {IOS solve(); return 0;}

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 7 / 7
• Subtask 4: 0 / 10
• Subtask 5: 20 / 20
• Subtask 6: 0 / 23
• Subtask 7: 0 / 26