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답안 #935692

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
935692 2024-02-29T11:48:34 Z OAleksa Regions (IOI09_regions) C++14
90 / 100
 8000 ms 113224 KB 
#include <bits/stdc++.h>
using namespace std;
#define f first
#define s second
const int N = 2e5 + 69;
const int R = 25069;
const int K = 17;
const int B = 300;
int n, q, r, a[N], cnt[R];
int timer, tin[N], tout[N], up[N][K];
int st[R * K * 15], lc[R * K * 15], rc[R * K * 15];
int root[N], node, l[R];
map<pair<int, int>, int> was;
vector<int> g[N], clr[R];
void modify(int v, int v1, int tl, int tr, int pos) {
	if (tl == tr)
		st[v] = st[v1] + 1;
	else {
		int mid = (tl + tr) / 2;
		if (pos <= mid) {
			lc[v] = ++node;
			rc[v] = rc[v1];
			modify(lc[v], lc[v1], tl, mid, pos);
		}
		else {
			rc[v] = ++node;
			lc[v] = lc[v1];
			modify(rc[v], rc[v1], mid + 1, tr, pos);
		}
		st[v] = st[lc[v]] + st[rc[v]];
	}
}

int get(int v, int tl, int tr, int pos) {
	if (tl == tr)
		return st[v];
	else {
		int mid = (tl + tr) / 2;
		if (pos <= mid)
			return get(lc[v], tl, mid, pos);
		else
			return get(rc[v], mid + 1, tr, pos);
	}
}

bool anc(int a, int b) {
	return tin[a] <= tin[b] && tout[a] >= tout[b];
}
int lca(int a, int b) {
	if (anc(a, b))
		return a;
	else if (anc(b, a))
		return b;
	for (int i = K - 1;i >= 0;i--) {
		if (!anc(up[a][i], b) && up[a][i] > 0)	
			a = up[a][i];
	}
	return up[a][0];
}
void dfs(int v, int p) {
	tin[v] = ++timer;
	up[v][0] = p;
	root[v] = ++node;
	clr[a[v]].push_back(v);
	modify(root[v], root[p], 1, n, a[v]);
	for (int i = 1;i < K;i++)
		up[v][i] = up[up[v][i - 1]][i - 1];
	for (auto u : g[v]) {
		if (u == p)
			continue;
		dfs(u, v);
	}
	tout[v] = timer;
}

signed main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int tt = 1;
  //cin >> tt;
  while (tt--) {
  	cin >> n >> r >> q;
  	cin >> a[1];
  	for (int i = 2;i <= n;i++) {
  		int x;
  		cin >> x >> a[i];
  		g[x].push_back(i);
  		g[i].push_back(x);
  		cnt[a[i]]++;
  	}
  	dfs(1, 0);
  	for (int i = 1;i <= r;i++) {
			if (!clr[i].empty()) {
				l[i] = clr[i].front();
				for (int j = 1;j < (int)clr[i].size();j++)
					l[i] = lca(l[i], clr[i][j]);
			}
		}
  	while (q--) {
  		int r1, r2;
  		cin >> r1 >> r2;
  		int ans = 0;
  		if (was.count({r1, r2}))
  			ans = was[{r1, r2}];
  		else if (cnt[r1] > B && cnt[r2] > B) {
  			//nadji lca i samo dfs
  			if (!clr[r1].empty()) {
  				function<void(int, int, int, int, int)> dfs = [&](int v, int p, int r1, int r2, int c) {
  					if (a[v] == r2)
  						ans += c;
  					for (auto u : g[v]) {
  						if (u == p)
  							continue;
  						dfs(u, v, r1, r2, c + (a[v] == r1));
  					}
  				};
  				dfs(l[r1], up[l[r1]][0], r1, r2, 0);
  			}
  		}
  		else if (cnt[r1] <= B) {
  			//binarna
  			for (auto i : clr[r1]) {
  				int m = clr[r2].size();
	  			int l = 0, r = m - 1, L = -1;
	  			while (l <= r) {
	  				int mid = (l + r) / 2;
	  				if (tin[clr[r2][mid]] >= tin[i]) {
	  					L = mid;
	  					r = mid - 1;
	  				}
	  				else
	  					l = mid + 1;
	  			}
	  			l = 0, r = m - 1;
	  			int R = -1;
	  			while (l <= r) {
	  				int mid = (l + r) / 2;
	  				if (tin[clr[r2][mid]] <= tout[i]) {
	  					R = mid;
	  					l = mid + 1;
	  				}
	  				else
	  					r = mid - 1;
	  			}
	  			if (L != -1 && R != -1)
	  				ans += R - L + 1;
  			}
  		}
  		else {
  			for (auto i : clr[r2]) 
  				ans += get(root[i], 1, n, r1);
  		}
  		//nsqrtnlogn
  		cout << ans << endl;
  		if (!was.count({r1, r2}))
  			was[{r1, r2}] = ans;
  	}
  }
  return 0;
}

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 14936 KB Output is correct
2 Correct 4 ms 14936 KB Output is correct
3 Correct 5 ms 15008 KB Output is correct
4 Correct 5 ms 15020 KB Output is correct
5 Correct 7 ms 15056 KB Output is correct
6 Correct 12 ms 15576 KB Output is correct
7 Correct 16 ms 15964 KB Output is correct
8 Correct 23 ms 16848 KB Output is correct
9 Correct 27 ms 18940 KB Output is correct
10 Correct 56 ms 19084 KB Output is correct
11 Correct 82 ms 19472 KB Output is correct
12 Correct 110 ms 22924 KB Output is correct
13 Correct 124 ms 25272 KB Output is correct
14 Correct 194 ms 27484 KB Output is correct
15 Correct 219 ms 32756 KB Output is correct

Subtask #2
75.0 / 85.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2053 ms 42300 KB Output is correct
2 Correct 1527 ms 42916 KB Output is correct
3 Correct 1704 ms 53876 KB Output is correct
4 Correct 193 ms 28012 KB Output is correct
5 Correct 257 ms 32992 KB Output is correct
6 Correct 496 ms 34676 KB Output is correct
7 Correct 591 ms 40684 KB Output is correct
8 Correct 994 ms 56444 KB Output is correct
9 Correct 1904 ms 76316 KB Output is correct
10 Execution timed out 8100 ms 84260 KB Time limit exceeded
11 Correct 3053 ms 93804 KB Output is correct
12 Correct 1159 ms 81660 KB Output is correct
13 Correct 1751 ms 84528 KB Output is correct
14 Execution timed out 8083 ms 89384 KB Time limit exceeded
15 Correct 2852 ms 100868 KB Output is correct
16 Correct 2702 ms 104788 KB Output is correct
17 Correct 5664 ms 113224 KB Output is correct