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Submission #254177

# Submission time Handle Problem Language Result Execution time Memory
254177 2020-07-29T13:03:09 Z Saboon Min-max tree (BOI18_minmaxtree) C++14
100 / 100
 435 ms 32504 KB 
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int maxn = 70000 + 20;

int E1[maxn], E2[maxn], W[maxn], c[maxn];
vector<int> t[maxn], g[maxn];
set<pair<int,int>> mn[maxn], mx[maxn];
char Qtype[maxn];
int Qv[maxn], Qu[maxn], Qz[maxn], p[maxn];
bool visited[maxn];
int match[maxn], fmatch[maxn];

bool dfs(int v){
	if (visited[v])
		return 0;
	visited[v] = 1;
	for (auto u : g[v]){
		if (match[u] == -1 or dfs(match[u])){
			match[u] = v;
			return true;
		}
	}
	return false;
}

void dfssack(int v, int par = -1){
	p[v] = par;
	for (auto u : t[v]){
		if (u == par)
			continue;
		dfssack(u,v);
		if (mx[c[u]].size() + mn[c[u]].size() > mx[c[v]].size() + mn[c[u]].size())
			swap(c[v],c[u]);
		for (auto it : mn[c[u]]){
			if (mn[c[v]].find(it) != mn[c[v]].end())
				mn[c[v]].erase(it);
			else
				mn[c[v]].insert(it);
		}
		for (auto it : mx[c[u]]){
			if (mx[c[v]].find(it) != mx[c[v]].end())
				mx[c[v]].erase(it);
			else
				mx[c[v]].insert(it);
		}
		mn[c[u]].clear(), mx[c[u]].clear();
	}
	if (!mx[c[v]].empty()){
		int idx = (*mx[c[v]].begin()).second;
		g[v].push_back(idx);
		W[v] = Qz[idx];
	}
	if (!mn[c[v]].empty()){
		int idx = (*mn[c[v]].begin()).second;
		g[v].push_back(idx);
		W[v] = Qz[idx];
	}
}

int main(){
	ios_base::sync_with_stdio(false);
	int n;
	cin >> n;
	for (int i = 1; i <= n-1; i++){
		cin >> E1[i] >> E2[i];
		t[E1[i]].push_back(E2[i]);
		t[E2[i]].push_back(E1[i]);
	}
	for (int i = 1; i <= n; i++)
		c[i] = i;
	int q;
	cin >> q;
	for (int i = 1; i <= q; i++){
		cin >> Qtype[i] >> Qv[i] >> Qu[i] >> Qz[i];
		if (Qtype[i] == 'm'){
			mn[c[Qv[i]]].insert({-Qz[i],i});
			mn[c[Qu[i]]].insert({-Qz[i],i});
		}
		else{
			mx[c[Qv[i]]].insert({+Qz[i],i});
			mx[c[Qu[i]]].insert({+Qz[i],i});
		}
	}
	dfssack(1);
	int maxMatch = 0;
	memset(match, -1, sizeof match);
	for (int i = 2; i <= n; i++){
		memset(visited, 0, sizeof visited);
		maxMatch += dfs(i);
	}
	for (int i = 1; i <= q; i++)
		W[match[i]] = Qz[i];
	for (int i = 2; i <= n; i++)
		cout << p[i] << " " << i << " " << W[i] << '\n'; 
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 10624 KB Output is correct
2 Correct 6 ms 10624 KB Output is correct
3 Correct 6 ms 10624 KB Output is correct
4 Correct 8 ms 10624 KB Output is correct

Subtask #2
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 322 ms 27512 KB Output is correct
2 Correct 333 ms 23032 KB Output is correct
3 Correct 324 ms 27384 KB Output is correct
4 Correct 328 ms 31096 KB Output is correct
5 Correct 340 ms 27020 KB Output is correct
6 Correct 335 ms 26232 KB Output is correct
7 Correct 318 ms 25336 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 246 ms 18168 KB Output is correct
2 Correct 243 ms 18300 KB Output is correct
3 Correct 256 ms 22068 KB Output is correct
4 Correct 253 ms 24056 KB Output is correct
5 Correct 271 ms 19448 KB Output is correct
6 Correct 269 ms 19960 KB Output is correct
7 Correct 248 ms 18552 KB Output is correct
8 Correct 261 ms 18424 KB Output is correct

Subtask #4
42.0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 10624 KB Output is correct
2 Correct 6 ms 10624 KB Output is correct
3 Correct 6 ms 10624 KB Output is correct
4 Correct 8 ms 10624 KB Output is correct
5 Correct 322 ms 27512 KB Output is correct
6 Correct 333 ms 23032 KB Output is correct
7 Correct 324 ms 27384 KB Output is correct
8 Correct 328 ms 31096 KB Output is correct
9 Correct 340 ms 27020 KB Output is correct
10 Correct 335 ms 26232 KB Output is correct
11 Correct 318 ms 25336 KB Output is correct
12 Correct 246 ms 18168 KB Output is correct
13 Correct 243 ms 18300 KB Output is correct
14 Correct 256 ms 22068 KB Output is correct
15 Correct 253 ms 24056 KB Output is correct
16 Correct 271 ms 19448 KB Output is correct
17 Correct 269 ms 19960 KB Output is correct
18 Correct 248 ms 18552 KB Output is correct
19 Correct 261 ms 18424 KB Output is correct
20 Correct 354 ms 25592 KB Output is correct
21 Correct 371 ms 24740 KB Output is correct
22 Correct 397 ms 26488 KB Output is correct
23 Correct 351 ms 24952 KB Output is correct
24 Correct 328 ms 30072 KB Output is correct
25 Correct 343 ms 32504 KB Output is correct
26 Correct 342 ms 31888 KB Output is correct
27 Correct 435 ms 29688 KB Output is correct
28 Correct 329 ms 26104 KB Output is correct
29 Correct 340 ms 26232 KB Output is correct
30 Correct 340 ms 24568 KB Output is correct
31 Correct 333 ms 24568 KB Output is correct
32 Correct 343 ms 25596 KB Output is correct
33 Correct 410 ms 25288 KB Output is correct
34 Correct 376 ms 25336 KB Output is correct
35 Correct 336 ms 24056 KB Output is correct