Submission #968050

#	Time	Username	Problem	Language	Result	Execution time	Memory
968050		Gromp15	Real Mountains (CCO23_day1problem2)	C++17	0 / 25	0 ms	348 KiB

Main

#include <bits/stdc++.h>
#define ll long long
#define ar array
#define db double
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define rint(l, r) uniform_int_distribution<int>(l, r)(rng)
template<typename T> bool ckmin(T &a, const T &b) { return a > b ? a = b, 1 : 0; }
template<typename T> bool ckmax(T &a, const T &b) { return a < b ? a = b, 1 : 0; }
const int mod = 1e6 + 3;
void test_case() {
	int n; cin >> n;
	vector<int> h(n);
	int mx = 0;
	for (int &x : h) cin >> x, ckmax(mx, x);
	vector<int> f(h);
	{
		int l = -1, r = -1;
		for (int i = 0; i < n; i++) if (h[i] == mx) {
			if (!~l) l = i;
			r = i;
		}
		for (int i = l; i <= r; i++) f[i] = mx;
		for (int i = 1; i < l; i++) ckmax(f[i], f[i-1]);
		for (int i = n-2; i > r; i--) ckmax(f[i], f[i+1]);
	}
	int ans = 0;
	vector<int> idx(n);
	iota(all(idx), 0);
	sort(all(idx), [&](int x, int y) { return h[x] < h[y]; });
	for (int _i = 0; _i < n; _i++) {
		int i = idx[_i];
		if (i == 0 || i == n-1 || h[i] == f[i]) continue;
		auto prog = [](int l, int r) {
			return (ll)(l+r)*(r-l+1)/2;
		};
		auto cost = [prog](int l, int r, int extra) {
			return (ll)extra * (r-l) + prog(l, r-1);
		};
		vector<int> l(h.begin(), h.begin() + i), r(h.begin() + i + 1, h.end());
		sort(all(l));
		sort(all(r));
		int a = 0, b = 0;
		while (h[i] < f[i]) {
			if (l[a] <= h[i]) a++;
			else if (r[b] <= h[i]) b++;
			else {
				int to = min({l[a], r[b], f[i]});
				ans += cost(h[i], to, l[a] + r[b]) % mod;
				if (ans >= mod) ans -= mod;
				h[i] = to;
			}
		}
	}
	cout << ans << '\n';



}
int main() {
    cin.tie(0)->sync_with_stdio(0);
    int t = 1;
//    cin >> t;
    while (t--) test_case();
}

• Subtask 1: 0 / 3
• Subtask 2: 0 / 3
• Subtask 3: 0 / 3
• Subtask 4: 0 / 3
• Subtask 5: 0 / 4
• Subtask 6: 0 / 5
• Subtask 7: 0 / 4