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답안 #791663

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
791663 2023-07-24T08:40:19 Z GEN 이지후(#10078) Nestabilnost (COI23_nestabilnost) C++17
39 / 100
 246 ms 96596 KB 
#include <bits/stdc++.h>
using namespace std;
using lint = long long;
using pi = array<lint, 2>;
#define sz(v) ((int)(v).size())
#define all(v) (v).begin(), (v).end()
const int MAXN = 300005;

int a[MAXN], f[MAXN], sm[MAXN], par[MAXN];
int root[MAXN];
vector<int> gph[MAXN];

void dfs(int x, int p) {
	if (p == -1)
		root[x] = 1, par[x] = -1;
	for (auto &y : gph[x]) {
		if (y != p) {
			if (a[y] <= a[x] && a[y] > 0)
				root[y] = 1;
			if (a[y] > a[x] + 1)
				root[y] = 1;
			par[y] = x;
			dfs(y, x);
		}
	}
}

struct node {
	int val;
	int canGeq;
	lint cost;
	lint eval() { return cost + (canGeq ? sm[val] : f[val]); }
	bool operator<(const node &nd) const { return val < nd.val; }
};

vector<node> solve(int x, int p) {
	vector<vector<node>> aggr;
	for (auto &y : gph[x]) {
		if (y != p && !root[y]) {
			auto v = solve(y, x);
			if (a[x] + 1 == a[y]) {
				lint totmin = 1e18;
				for (auto &x : v)
					totmin = min(totmin, x.eval());
				v.insert(v.begin(), {0, 1, totmin});
			} else {
				lint costEq = 1e18;
				lint totmin = 1e18;
				for (auto &foo : v) {
					if (foo.val == a[x] + 1 || (foo.val <= a[x] + 1 && foo.canGeq)) {
						costEq = min(costEq, foo.cost);
					}
					totmin = min(totmin, foo.eval());
				}
				v.clear();
				v.push_back({0, 1, totmin});
				v.push_back({a[x] + 1, 0, costEq});
				// k = a[x] + 1 or k >= 0
			}
			aggr.push_back(v);
		}
	}
	if (sz(aggr) == 0) {
		vector<node> ret;
		ret.push_back({a[x] + 1, 1, 0});
		return ret;
	}
	vector<node> ret;
	// generate geqs
	{
		vector<lint> costPoses(sz(aggr), 1e18);
		vector<array<lint, 3>> upd;
		for (int i = 0; i < sz(aggr); i++) {
			for (auto &y : aggr[i]) {
				if (y.canGeq) {
					upd.push_back({max(y.val, a[x] + 1), y.cost, i});
				}
			}
		}
		int toolarge = sz(aggr);
		sort(all(upd));
		lint t1 = 1e17;
		lint sum = 0;
		for (int i = 0; i < sz(upd);) {
			int j = i;
			while (j < sz(upd) && upd[j][0] == upd[i][0])
				j++;
			for (int k = i; k < j; k++) {
				if (costPoses[upd[k][2]] > 5e17) {
					toolarge--;
					sum += upd[k][1];
				} else {
					if (costPoses[upd[k][2]] > upd[k][1]) {
						sum += upd[k][1] - costPoses[upd[k][2]];
					}
				}
				costPoses[upd[k][2]] = min(costPoses[upd[k][2]], upd[k][1]);
			}
			if (toolarge) {
				i = j;
				continue;
			}
			if (t1 > sum) {
				t1 = sum;
				ret.push_back({(int)upd[i][0], 1, t1});
			}
			i = j;
		}
	}
	// generate eqs (mutate if u like it)
	{
		vector<int> coords;
		for (auto &v : aggr) {
			lint prefix = 1e18;
			for (auto &y : v) {
				if (y.canGeq == 0 && y.val > a[x])
					coords.push_back(y.val);
				if (y.canGeq) {
					prefix = min(prefix, y.cost);
					y.cost = prefix;
				}
			}
		}
		sort(all(coords));
		coords.resize(unique(all(coords)) - coords.begin());
		for (auto &x : coords) {
			lint tot = 0;
			for (auto &v : aggr) {
				int pos = upper_bound(all(v), (node){x, 0, 0}) - v.begin();
				lint minv = 1e18;
				for (int j = pos - 1; j >= max(0, pos - 3); j--) {
					if (v[j].canGeq)
						minv = min(minv, v[j].cost);
					else if (!v[j].canGeq && v[j].val == x)
						minv = min(minv, v[j].cost);
				}
				tot += minv;
				if (tot > 2e17) {
					break;
				}
			}
			if (tot < 1e17)
				ret.push_back({x, 0, tot});
		}
	}

	return ret;
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n;
	cin >> n;
	for (int i = 0; i < n; i++)
		cin >> a[i];
	for (int i = 1; i <= n; i++) {
		cin >> f[i];
	}
	sm[n + 1] = 1e9;
	for (int i = n; i; i--) {
		sm[i] = min(sm[i + 1], f[i]);
	}
	for (int i = 0; i < n - 1; i++) {
		int u, v;
		cin >> u >> v;
		u--;
		v--;
		gph[u].push_back(v);
		gph[v].push_back(u);
	}
	dfs(0, -1);
	lint ans = 0;
	for (int i = 0; i < n; i++) {
		if (root[i]) {
			auto foo = solve(i, par[i]);
			lint tot = 1e18;
			for (auto &x : foo)
				tot = min(tot, x.eval());
			ans += tot;
		}
	}
	cout << ans << "\n";
}

Subtask #1
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 8800 KB Output is correct
2 Correct 6 ms 8788 KB Output is correct
3 Correct 7 ms 8788 KB Output is correct
4 Correct 8 ms 8788 KB Output is correct
5 Correct 6 ms 7892 KB Output is correct
6 Correct 8 ms 7892 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 201 ms 96504 KB Output is correct
2 Correct 211 ms 96512 KB Output is correct
3 Correct 246 ms 96592 KB Output is correct
4 Correct 226 ms 96596 KB Output is correct
5 Correct 204 ms 96592 KB Output is correct
6 Correct 215 ms 40172 KB Output is correct
7 Correct 204 ms 40584 KB Output is correct
8 Correct 198 ms 41272 KB Output is correct
9 Correct 225 ms 41396 KB Output is correct

Subtask #3
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 7392 KB Output is correct
2 Correct 3 ms 7380 KB Output is correct
3 Correct 4 ms 7380 KB Output is correct
4 Correct 4 ms 7324 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7380 KB Output is correct
7 Correct 5 ms 7380 KB Output is correct

Subtask #4
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 8800 KB Output is correct
2 Correct 6 ms 8788 KB Output is correct
3 Correct 7 ms 8788 KB Output is correct
4 Correct 8 ms 8788 KB Output is correct
5 Correct 6 ms 7892 KB Output is correct
6 Correct 8 ms 7892 KB Output is correct
7 Correct 3 ms 7392 KB Output is correct
8 Correct 3 ms 7380 KB Output is correct
9 Correct 4 ms 7380 KB Output is correct
10 Correct 4 ms 7324 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 4 ms 7380 KB Output is correct
13 Correct 5 ms 7380 KB Output is correct
14 Correct 7 ms 7608 KB Output is correct
15 Correct 7 ms 7636 KB Output is correct
16 Correct 6 ms 7636 KB Output is correct
17 Correct 7 ms 7636 KB Output is correct
18 Correct 8 ms 7636 KB Output is correct
19 Incorrect 7 ms 7636 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #5
0 / 39.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 8800 KB Output is correct
2 Correct 6 ms 8788 KB Output is correct
3 Correct 7 ms 8788 KB Output is correct
4 Correct 8 ms 8788 KB Output is correct
5 Correct 6 ms 7892 KB Output is correct
6 Correct 8 ms 7892 KB Output is correct
7 Correct 201 ms 96504 KB Output is correct
8 Correct 211 ms 96512 KB Output is correct
9 Correct 246 ms 96592 KB Output is correct
10 Correct 226 ms 96596 KB Output is correct
11 Correct 204 ms 96592 KB Output is correct
12 Correct 215 ms 40172 KB Output is correct
13 Correct 204 ms 40584 KB Output is correct
14 Correct 198 ms 41272 KB Output is correct
15 Correct 225 ms 41396 KB Output is correct
16 Correct 3 ms 7392 KB Output is correct
17 Correct 3 ms 7380 KB Output is correct
18 Correct 4 ms 7380 KB Output is correct
19 Correct 4 ms 7324 KB Output is correct
20 Correct 4 ms 7380 KB Output is correct
21 Correct 4 ms 7380 KB Output is correct
22 Correct 5 ms 7380 KB Output is correct
23 Correct 7 ms 7608 KB Output is correct
24 Correct 7 ms 7636 KB Output is correct
25 Correct 6 ms 7636 KB Output is correct
26 Correct 7 ms 7636 KB Output is correct
27 Correct 8 ms 7636 KB Output is correct
28 Incorrect 7 ms 7636 KB Output isn't correct
29 Halted 0 ms 0 KB -