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답안 #940174

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
940174 2024-03-07T06:23:43 Z vjudge1 꿈 (IOI13_dreaming) C++17
18 / 100
 51 ms 40404 KB 
#include<bits/stdc++.h>	
#include "dreaming.h"
using namespace std;

#define all(a) a.begin(), a.end()                                                   
#define rall(a) a.rbegin(), a.rend()                 
#define sz(a) (int)a.size()
#define s second
#define f first
 
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
     
vector<pii> rid = {{0, 1}, {0, -1}, {1, 0}, {-1, 0}};
vector<pii> dir = {{-1, -1}, {-1, 1}, {1, -1}, {1, 1}};

const int inf = 1e9, N = 1e6;

int travelTime2(int n, int l, vector<int> s) {
	//cout << n << '\n';
	//for (int x: s) cout << x << ' ';
	//cout << '\n';
	if (n == 1) return 0;
	if (n == 2) {
		if (sz(s)) return s[0];
		return l;
	}
	s.push_back(0);
	s.push_back(0);
	s.push_back(0);
	sort(rall(s));
	return max(s[0] + s[1] + l, s[1] + s[2] + 2 * l);	     	
}

vector<int> d0(N, inf), d1(N, inf);
vector<pii> g[N];

int calc(int x, int n) {
	set<pii> s;
	vector<int> h;
	d0[x] = 0;
	s.insert({0, x});
	int a = x;
	while (sz(s)) {
		x = (*s.begin()).s;
		if (d0[x] > d0[a]) a = x;
		h.push_back(x);
		s.erase(s.begin());
		for (auto [to, w]: g[x]) {
			if (d0[to] < d0[x] + w) continue;
			s.erase({d0[to], to});
			d0[to] = d0[x] + w;
			s.insert({d0[to], to});
 		}
	}
	d1[a] = 0;
	s.insert({0, a});
	int b = a;
	while (sz(s)) {
		x = (*s.begin()).s;
		if (d1[x] > d1[b]) b = x;
		s.erase(s.begin());
		for (auto [to, w]: g[x]) {
			if (d1[to] < d1[x] + w) continue;
			s.erase({d1[to], to});
			d1[to] = d1[x] + w;
			s.insert({d1[to], to});
 		}
	}
	for (int v: h) d0[v] = inf;
	d0[b] = 0;
	s.insert({0, b});
	while (sz(s)) {
		x = (*s.begin()).s;
		s.erase(s.begin());
		for (auto [to, w]: g[x]) {
			if (d0[to] < d0[x] + w) continue;
			s.erase({d0[to], to});
			d0[to] = d0[x] + w;
			s.insert({d0[to], to});
 		}
	}
	int ans = inf;
	for (int v: h) {
		x = max(d0[v], d1[v]);
		ans = min(ans, x);
		d0[v] = d1[v] = inf;
	}
	return ans;
}

int p[N], sz[N];

int get(int x) {
	if (p[x] == x) return x;
	return p[x] = get(p[x]);
}

void unite(int a, int b) {
	a = get(a), b = get(b);
	if (a == b) return;
	if (sz[a] > sz[b]) swap(a, b);
	p[a] = b;
	sz[b] += sz[a];
}

int travelTime(int n, int m, int l, int a[], int b[], int c[]) {    
	for (int i = 1; i <= n; i++) p[i] = i, sz[i] = 1;
	for (int i = 0; i < m; i++) {
		g[a[i]].push_back({b[i], c[i]});
		g[b[i]].push_back({a[i], c[i]});
		unite(a[i], b[i]);
	}
	vector<int> s;
	int cnt = 0;
	for (int i = 1; i <= n; i++) {
		if (i == get(i)) cnt++;
		if (i == get(i) && sz[i] > 1) s.push_back(calc(i, n)), cnt++;
	}
	return travelTime2(cnt, l, s);
}

#ifdef M
main() {
	//freopen("rsq.in", "r", stdin);                                                                                     
	//freopen("rsq.out", "w", stdout);                                                                                     
	ios_base::sync_with_stdio(0);	                                                                                       
	cin.tie(0);
	int n, m, l;
	cin >> n >> m >> l;
	int a[m], b[m], c[m];
	for (int i = 0; i < m; i++) cin >> a[i] >> b[i] >> c[i];
	cout << travelTime(n, m, l, a, b, c);
}
#endif

Subtask #1
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 51 ms 40404 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 9 ms 36444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 51 ms 40404 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 34 ms 38756 KB Output is correct
2 Correct 32 ms 38856 KB Output is correct
3 Correct 32 ms 38744 KB Output is correct
4 Correct 33 ms 38740 KB Output is correct
5 Correct 33 ms 38736 KB Output is correct
6 Correct 35 ms 39128 KB Output is correct
7 Correct 35 ms 39152 KB Output is correct
8 Correct 32 ms 38752 KB Output is correct
9 Correct 31 ms 38748 KB Output is correct
10 Correct 33 ms 39084 KB Output is correct
11 Correct 9 ms 36696 KB Output is correct
12 Correct 10 ms 36440 KB Output is correct
13 Correct 10 ms 36444 KB Output is correct
14 Correct 10 ms 36268 KB Output is correct
15 Correct 10 ms 36512 KB Output is correct
16 Correct 10 ms 36440 KB Output is correct
17 Correct 10 ms 36444 KB Output is correct
18 Correct 11 ms 36456 KB Output is correct
19 Correct 10 ms 36440 KB Output is correct
20 Correct 9 ms 36452 KB Output is correct
21 Correct 9 ms 36452 KB Output is correct
22 Correct 11 ms 36448 KB Output is correct
23 Correct 9 ms 36468 KB Output is correct

Subtask #5
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 9 ms 36444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 51 ms 40404 KB Output isn't correct
2 Halted 0 ms 0 KB -